Pesticide Residues on Three Cut Flower Species and Potential Exposure of Florists in Belgium

Abstract

In order to assess the prevalence of pesticide contamination and the risk of florists' exposure when handling cut flowers, sampling and analysis of 90 bouquets of the most commonly sold cut flowers in Belgium (50 bouquets of roses; 20 of gerberas, and 20 of chrysanthemums) were carried out. The bouquets were collected from 50 florists located in the seven largest cities of Belgium (Antwerp, Brussels, Charleroi, Ghent, Leuven, Liege, and Namur) and from five supermarkets located in the different regions. To have a better understanding of the route of exposure and professional practices a questionnaire was also addressed to a group of 25 florists who volunteered to take part in the survey. All florists were interviewed individually when collecting the questionnaire. The residual pesticide deposit values on cut flowers were determined in an accredited laboratory using a multi-residue (QuEChERS Quick Easy Cheap Effective Rugged Safe) method and a combination of gas chromatography (GC) and liquid chormatograhphy (LC) analysis. A total of 107 active substances were detected from all samples; i.e., an average of about 10 active substances per bouquet. The most severely contaminated bouquet accumulated a total concentration of residues up to 97 mg/kg. Results show that roses are the most contaminated cut flowers; with an average of 14 substances detected per sample and a total concentration per rose sample of 26 mg/kg. Some active substances present an acute toxicity (acephate, methiocarb, monocrotophos, methomyl, deltamethrin, etc.) and exposure can generate a direct effect on the nervous system of florists. Nevertheless, fungicides (dodemorph, propamocarb, and procymidone) were the most frequently detected in samples and had the highest maximum concentrations out of all the active substances analysed. Dodemorph was the most frequently detected substance with the highest maximum concentration (41.9 mg/kg) measured in the rose samples. It appears from the survey that, despite being exposed to high deposits of residues, florists usually do not protect themselves from contact with residues even if they spend several hours handling cut flowers and preparing bouquets (from 2 to 6 h/day, depending on the time of year and/or selling periods) daily. Bad habits (eating, drinking, or smoking at work) and absence of personal protective equipment of most florists also increase the risk of contact with pesticide residues.

Full text

International Journal of
Environmental Research
and Public Health
Article
Pesticide Residues on Three Cut Flower Species and
Potential Exposure of Florists in Belgium
Khaoula Toumi 1,*, Christiane Vleminckx 2, Joris van Loco 2and Bruno Schiffers 1
1Gembloux Agro-Bio Tech/ULg—Laboratoire de Phytopharmacie, Passage des Déportés 2,
Gembloux 5030, Belgium; bruno.schiffers@ulg.ac.be
2
Institut Scientifique de Santé Publique, OD Food, Medecines and Consumer Safety, Rue Juliette Wytsman 14,
Brussels 1050, Belgium; Christiane.Vleminckx@wiv-isp.be (C.V.); Joris.vanloco@wiv-isp.Be (J.v.L.)
*Correspondence: khaoula.toumi@doct.ulg.ac.be; Tel.: +32-081-622-215
Academic Editor: Ricardo Bello-Mendoza
Received: 11 July 2016; Accepted: 19 September 2016; Published: 23 September 2016
Abstract:
In order to assess the prevalence of pesticide contamination and the risk of florists’ exposure
when handling cut flowers, sampling and analysis of 90 bouquets of the most commonly sold cut
flowers in Belgium (50 bouquets of roses; 20 of gerberas, and 20 of chrysanthemums) were carried
out. The bouquets were collected from 50 florists located in the seven largest cities of Belgium
(Antwerp, Brussels, Charleroi, Ghent, Leuven, Liege, and Namur) and from five supermarkets
located in the different regions. To have a better understanding of the route of exposure and
professional practices a questionnaire was also addressed to a group of 25 florists who volunteered to
take part in the survey. All florists were interviewed individually when collecting the questionnaire.
The residual pesticide deposit values on cut flowers were determined in an accredited laboratory using
a multi-residue (QuEChERS Quick Easy Cheap Effective Rugged Safe) method and a combination of
gas chromatography (GC) and liquid chormatograhphy (LC) analysis. A total of 107 active substances
were detected from all samples; i.e., an average of about 10 active substances per bouquet. The most
severely contaminated bouquet accumulated a total concentration of residues up to 97 mg/kg.
Results show that roses are the most contaminated cut flowers; with an average of 14 substances
detected per sample and a total concentration per rose sample of 26 mg/kg. Some active substances
present an acute toxicity (acephate, methiocarb, monocrotophos, methomyl, deltamethrin, etc.) and
exposure can generate a direct effect on the nervous system of florists. Nevertheless, fungicides
(dodemorph, propamocarb, and procymidone) were the most frequently detected in samples and
had the highest maximum concentrations out of all the active substances analysed. Dodemorph
was the most frequently detected substance with the highest maximum concentration (41.9 mg/kg)
measured in the rose samples. It appears from the survey that, despite being exposed to high deposits
of residues, florists usually do not protect themselves from contact with residues even if they spend
several hours handling cut flowers and preparing bouquets (from 2 to 6 h/day, depending on the time
of year and/or selling periods) daily. Bad habits (eating, drinking, or smoking at work) and absence of
personal protective equipment of most florists also increase the risk of contact with pesticide residues.
Keywords: cut flowers; roses; pesticide residues; exposure risk evaluation; florists
1. Introduction
Flowers are used for beautification purpose or given as an expression of love, friendship, gratitude,
or appreciation [
1
]. They are sold throughout the year, but with peak periods (Valentine’s Day,
Halloween, Mother’s Day, New Year, etc.). Today, the cut flowers world market represents about
30 billion Euros per year. Europe and North America are still the main markets [
2
]. The European
demand of cut flowers (cut flowers and pots) is estimated to 13 billion Euros, representing 50% of the
Int. J. Environ. Res. Public Health 2016,13, 943; doi:10.3390/ijerph13100943 www.mdpi.com/journal/ijerph

Int. J. Environ. Res. Public Health 2016,13, 943 2 of 14
world’s demand [
3
]. As a result, millions of flowers produced in Africa, India, Israel, or Latin America
travel by road and air to consumer markets located essentially in the rich or emerging countries of the
Northern hemisphere. Three hundred fifty million cut flowers are imported each year in the United
States and similar quantities are imported in Canada and Europe [4].
Flower production is a dynamic sector in European horticulture with a high growth potential and
a major economic weight in international trade [
5
]. Traditionally in Europe, floriculture is most strongly
developed in The Netherlands and Belgium, but cut flowers are also among the intensive crops grown
in greenhouses in Great Britain [
6
]. As in any intensive culture, flowers require the use of a wide
range of pesticides to control diseases and pests, which can damage production and marketability.
Plants and flowers entering into the European market must meet stringent regulations on plant health
designed to prevent introduction of some pests or diseases. Therefore, imported cut flowers receive
heavy pesticide applications prior to shipment. In 1977, a sampling of all flowers imported to Miami
on three consecutive days showed that 18 bouquets of 105 (17.7%) contained pesticide residue levels
superior to 5 ppm, and three samples had levels superior to 400 ppm [
4
]. The lack of maximum residue
limits (MRL) for flowers explains that, unlike other crops which are harvested for consumption, there
is no restriction on the use of pesticides and cut flowers are often treated regularly up to harvesting or
even after harvest. This also explains the modest development of an “organic” sector or integrated
pest management (IPM) in floriculture.
Many pesticides applied on flowers are persistent, dislodgeable by contact with the hands, and
are fat-soluble. As they can easily be absorbed through skin contact, florists who handle the flowers
daily and for several hours can potentially be exposed to residual deposits of pesticides and possibly
endanger their health. Health problems have been reported all over the world for workers and
professionals exposed to pesticides daily, including contact allergies, dermatitis and skin effects [
7
,
8
],
neurologic pathologies [
9
–
13
] or even increases in certain types of cancers [
10
,
14
,
15
], hematotoxic
effects [
16
,
17
], endocrine disruptor effects [
18
], or cytogenetic damage [
19
]. Hormonal and reproductive
problems of workers (abortions, prematurity, stillbirth, and congenital malformations, low fecundity)
have also been reported [
20
,
21
]. Various detrimental health disorders were mentioned for female
florists and their children in Colombia [
22
,
23
] and other developing countries. Therefore, in Europe,
EFSA (European Food Safety Authority) reviews, in close cooperation with EU Member States, the
risk of exposure of each active substance for operators, workers, bystanders, and residents before
plant protection products are allowed to be used in crops or greenhouses [
24
]. Nevertheless, despite
an important potential exposure and a subsequent high level of risk for this group of workers, only
a small amount of information was available in Belgium or in Europe about the contamination of
flowers and the exposure of florists in link with their professional practices. This information is crucial
when people want to assess the risk. As a first step in developing an exposure assessment framework
of florists (hazard identification and characterization) we have investigated the extent and severity
of pesticide contamination (nature, frequency, and concentrations of pesticide deposits) of the most
commonly sold cut flowers in Belgium and the main activities of florists to prepare the bouquets.
This survey will be completed later by results of field and laboratory trials to measure the dislodgeable
foliar residues (DFR), the transfer from plant to hands and, finally, to estimate the dermal exposure of
florists to pesticides applied on cut flowers.
2. Methods
2.1. Sampling of Cut Flowers
In order to assess the prevalence of pesticide contamination and to evaluate the average levels
of contamination of the cut flowers most commonly sold in Belgium (roses, the number one flower
sold annually, gerberas, and chrysanthemums) a sampling of 90 bouquets (50 of roses, 20 of gerberas,
and 20 of chrysanthemums) was carried out at 50 florist’s premises. The sampling size was estimated
according to a similar study carried out by Morse et al. [
4
] who estimated the minimum sample size

Int. J. Environ. Res. Public Health 2016,13, 943 3 of 14
required to detect 10% of contamination when a 0% level is expected to be 77 samples, and sampled
105 bouquets from 43 different growers to assess flower contamination in the United States.
Fifty samples of roses (at least five stems per bouquet) were collected within three consecutive
days in February (the Valentine Day period). The bouquets were sampled from 45 florists located in the
seven largest cities of Belgium (Antwerp, Brussels, Charleroi, Ghent, Leuven, Liege, and Namur) and
from five supermarkets located in the different regions. Bouquets of gerberas and chrysanthemums
were collected in 25 florist’s shops located in Brussels and Wallonia within three consecutive days
in April. After collection, the sampled bouquets were kept in a cool room in vases filled with water and
two centimetres of stems were cut obliquely using a sterilised sharp knife to maintain water absorption
during storage before analysis. Although cut flowers normally last a fortnight in these conditions,
the samples were kept for no more than three days before being taken to the analytical laboratory
(transport by road from Gembloux to Ghent).
2.2. Analysis of the Residual Pesticide Deposits on the Bouquets
The residual pesticide deposits on the bouquets were analysed by PRIMORIS (formerly FYTOLAB,
Technologiepark 2/3, 9052 Zwijnaarde, Belgium) laboratory holding a BELAC (Belgian Accreditation
Council) accreditation to ISO/CEI 17025 for pesticide residues on vegetables and herbal products
in general. PRIMORIS is an independent, accredited, and officially recognized service laboratory.
Samples were analysed with a multi-residue (QuEChERS) method validated by the laboratory for
analysis of residues in foodstuffs, which will detect approximately 500 different active substances in
a single analysis thanks to a combination of gas chromatography (GC) and liquid chromatography (LC).
The QuEChERS method is based on work accomplished and published by Anastassiades et al. [
25
].
After the sample (five flower stems) had been totally crushed, one homogenous 10 g sub-sample is
homogenized by vortex mixing in a blender with acetonitrile to extract the residues. After agitation the
extract is put through a clean-up column prior to analysis by gas or liquid chromatography with mass
spectrometry (GC or LC-MS/MS) according to the active substances to be determined (GC-MS/MS
for small, thermally-stable, volatile, non-polar molecules, or LC-MS/MS for larger, thermolabile,
non-volatile, and polar molecules). For almost all active substances, the quantification limit (LOQ) was
≤0.01 mg/kg.
2.3. Statistical Analyses
All results of pesticide residues (number of active substances (a.s.) found and the total load of
pesticides per sample) were analysed with a Student’s t-test using Minitab 16 Statistical Software
(Minitab Inc., State college, PA, USA).
2.4. Exposure Scenario of Florists
EFSA has adopted the following definition for “workers”: they are persons who, as part of
their employment, enter an area that has previously been treated with a plant protection product
(PPP) or who handle a crop that has been treated with a PPP. Since worker exposures can vary
substantially for a given scenario (e.g., nature of activities and duration of work), it is necessary to have
a clear idea of the professional practices in order to be confident that individual exposures will not be
importantly underestimated. As the sources of exposure are in contact with foliage, exposure of florists
must be estimated for activities that involve significant contact with treated plants. To have a better
understanding of the route of exposure and professional practices a questionnaire was also addressed
to a group of 25 florists who volunteered to take part in the survey. All florists were interviewed
individually when collecting the questionnaire. The size of the group was considered large enough to
be representative as they all sell the same flowers in Belgium and have the same activities to prepare
the bouquets. In a similar study in the United States [
4
] 20 flower inspectors participated and only
12 were interviewed. The florists were randomly chosen from professionals located in the Province
of Namur (16 florists, i.e., 64%), and the Brussels-Capital Region (nine florists, i.e., 36%). They were

Int. J. Environ. Res. Public Health 2016,13, 943 4 of 14
asked to answer a detailed questionnaire (five pages) on their personal history, the flowers sold from
their premises (flower species and origins), their usual practices, their estimated working hours, their
personal protective equipment (PPE) worn, their hygiene rules, and their perception of health problems
linked with their occupation. All of the questionnaires were filled in and collected in the week during
which the samples were taken for analysis of residual pesticide deposits.
3. Results
3.1. Origins of the Cut Flowers Collected and Analysed
The 25 florists surveyed purchased flowers from wholesalers. The roses had the widest range
of sources: 96% of the florists surveyed purchased roses from Holland, 92% from Belgium, 60% from
Kenya, 40% from Israel, 36% from Ecuador or Ethiopia and Morocco (12% together). 80% of the florists
purchased chrysanthemums from The Netherlands, 72% from Belgium, and 4% from Israel. Gerberas
came, in order of importance, from Belgium, The Netherlands, France, and Israel. As the bouquets
were sampled randomly at the shops visited, there was no attempt to reproduce the origins declared
in the questionnaires proportionally for the samples analysed. During sampling, the bouquets were
labelled and the countries of origin identified by asking the florist. The origin of bouquets collected in
the supermarkets was unknown. As expected from the survey, declared countries of origin vary widely
for roses (eight countries, Belgium included), while gerberas and chrysanthemums collected were
identified as flowers from Belgium and The Netherlands, but the traceability of cut flowers cannot be
considered as reliable.
3.2. Global Results of Analyses of Residual Deposits
The pesticides residues levels (Table 1) and the number of active substances (Table 2) were
determined on the 90 samples of cut flowers.
Table 1. Pesticide residue levels in 90 samples of cut flowers sampled in Belgium (2016).
Total Pesticide Residues Concentration
(mg/kg, All a.s. Together)
Samples with Pesticide Residues
Number of Samples %
0.01–0.99 15 17
1.00–4.99 21 23
5.00–9.99 15 17
10.0–50.00 35 39
>50.00 4 4
Total 90 100
Table 2.
Total number of active substances (a.s.) detected, average number of a.s. per sample (min-max),
average total concentration of residues (mg/kg), median concentration, and maximum cumulated
deposit (sample with the highest total amount of pesticide residues, in mg/kg) observed on a bouquet,
for the three species.
Flower Species Roses Gerberas Chrysanthemums
Total number of active substances detected 97 30 31
Average number of active substances/sample 13.6 4.3 6.2
(minimum–maximum number) (3–28) (1–9) (0–15)
Total load average in pesticides/sample (mg/kg) 26.03 1.70 3.99
Median concentration/sample (mg/kg) 24.35 1.73 2.65
Maximum cumulated deposit/sample (mg/kg) 97.03 4.41 15.73
A statistical analysis performed on the results shows a significant difference between
contamination levels according to the species (Table 3).

Int. J. Environ. Res. Public Health 2016,13, 943 5 of 14
Table 3.
Statistical analysis (Student’s t-test, using Minitab
®
16 software) of the contamination levels
(number of a.s. found and the total load average in pesticides per sample) and comparison between
the three species.
Flower Species Number of Active Substances Total Load in Pesticides (mg/kg)
T-Value p-Value T-Value p-Value
Roses/Gerberas 4.66 a0.000 4.92 a0.000
Roses/Chrysanthemums
3.42 a0.002 4.42 a0.000
Gerberas/Chrysanthemums
−2.04 a0.050 −2.36 a0.028
aSignificant difference between results.
It appears also that the bouquets on which the highest number of different a.s. have been detected
are also those which were the most contaminated by residues. This can be interpreted as an index
of bad phytosanitary practices (numerous and repeated treatments with several PPP instead of an
alternation between them in an Integrated Pest Management scheme) (Figure 1). Whatever their
origins, samples are contaminated by numerous a.s. (22 up to 60 different a.s. according to declared
country of origin). A total of 107 a.s. are present (Table 4).
Int. J. Environ. Res. Public Health 2016, 13, 943 5 of 14
Table 3. Statistical analysis (Student’s t-test, using Minitab® 16 software) of the contamination levels
(number of a.s. found and the total load average in pesticides per sample) and comparison between
the three species.
Flower Species Number of Active Substances Total Load in Pesticides (mg/kg)
T-Value p-Value T-Value p-Value
Roses/Gerberas 4.66
a 0.000 4.92
a 0.000
Roses/Chrysanthemums 3.42
a 0.002 4.42
a 0.000
Gerberas/Chrysanthemums −2.04 a 0.050 −2.36 a 0.028
a Significant difference between results.
It appears also that the bouquets on which the highest number of different a.s. have been
detected are also those which were the most contaminated by residues. This can be interpreted as an
index of bad phytosanitary practices (numerous and repeated treatments with several PPP instead of
an alternation between them in an Integrated Pest Management scheme) (Figure 1). Whatever their
origins, samples are contaminated by numerous a.s. (22 up to 60 different a.s. according to declared
country of origin). A total of 107 a.s. are present (Table 4).
Figure 1. Variation in the total load of pesticides (mg/kg)/sample according to the number of active
substances detected/sample.
Table 4. Number of different active substances present in the samples of each species, according to
country of origin (n = number of samples collected/origin). A total of 107 a.s. have been detected
on samples.
Origin Roses Gerberas Chrysanthemums
Belgium 38 (n = 8) 18 (n = 11) 17 (n = 2)
Colombia 24 (n = 2) - -
Ecuador 60 (n = 9) - -
Ethiopia 29 (n = 3) - -
Germany 22 (n = 1) - -
Israel 27 (n = 2) - -
The Netherlands 54 (n = 11) 24 (n = 9) 28 (n = 18)
Kenya 48 (n = 9) - -
Unknown (supermarkets) 36 (n = 5) - -
y = 0.0084x2+ 1.6778x - 2.0737
R² = 0.4321
0.01
0.1
1
10
100
0 5 10 15 20 25 30
Total load average of
pesticides/sample (mg/kg)
Number of active substances/sample
Figure 1.
Variation in the total load of pesticides (mg/kg)/sample according to the number of active
substances detected/sample.
Table 4.
Number of different active substances present in the samples of each species, according to
country of origin (n= number of samples collected/origin). A total of 107 a.s. have been detected
on samples.
Origin Roses Gerberas Chrysanthemums
Belgium 38 (n= 8) 18 (n= 11) 17 (n= 2)
Colombia 24 (n= 2) - -
Ecuador 60 (n= 9) - -
Ethiopia 29 (n= 3) - -
Germany 22 (n= 1) - -
Israel 27 (n= 2) - -
The Netherlands 54 (n= 11) 24 (n= 9) 28 (n= 18)
Kenya 48 (n= 9) - -
Unknown (supermarkets) 36 (n= 5) - -

Int. J. Environ. Res. Public Health 2016,13, 943 6 of 14
3.3. Detailed Results of Analyses: Nature and Prevalence of Pesticide Residues
The following table list the 107 active substances found (concentration > 0.01 mg/kg) in the
90 samples of cut flowers and their maximum concentrations (Tables 5and 6). Frequency of
a.s. in samples varies between the three species: dodemorph (a fungicide) is the most frequent
active substance for roses, fluopyram (a fundicide) for gerberas, and bifenazate, thiamethoxam, and
tolclofos-methyl (an acaricide, an insecticide and a fungicide) for chrysanthemums.
Table 5. Number of active substances found in the 90 samples according to their biological activity.
Biological Activity Roses Gerbera Chrysanthemums
Fungicides 46 15 12
Herbicides 1 - -
Insecticides 47 14 19
Growth regulators 3 1 -
Table 6.
Alphabetic classification of all a.s. present in the 90 samples of roses, gerberas, and
chrysanthemums, number of detections (concentrations > LOQ), frequency (samples in % containing
the a.s.), and maximum concentration values.
Active Substances
Detected in the Samples
Roses Gerberas Chrysanthemums
Number of
Detections
(out of 50)
(Frequency)
Maximum
Concentration
(mg/kg)
Number of
detections
(out of 20)
(Frequency)
Maximum
Concentration
(mg/kg)
Number of
Detections
(out of 20)
(Frequency)
Maximum
Concentration
(mg/kg)
6-Benzyladenine 1 (2%) 0.02 0 <0.01 0 <0.01
Acephate 15 (30%) 21.90 0 <0.01 2 (10%) 2.10
Acetamiprid 12 (24%) 0.71 1 (5%) 0.01 0 <0.01
Acrinatrin 1 (2%) 0.05 0 <0.01 0 <0.01
Ametoctradin 6 (12%) 0.30 0 <0.01 0 <0.01
Azadirachtine 0 <0.01 3 (15%) 0.13 4 (20%) 1.30
Azoxystrobin 6 (12%) 0.06 0 <0.01 0 <0.01
Benalaxyl 1 (2%) 0.14 0 <0.01 0 <0.01
Benomyl (carbendazim) 22 (44%) 27.30 2 (10%) 0.03 0 <0.01
Bifenazate 2 (4%) 0.12 0 <0.01 17 (85%) 0.53
Bifenthrin 1 (2%) 0.69 0 <0.01 0 <0.01
Bitertanol 1 (2%) 0.03 1 (5%) 0.06 0 <0.01
Boscalid 20 (40%) 12.90 2 (10%) 0.08 1 (5%) 0.05
Bupirimate 9 (18%) 1.80 3 (15%) 0.04 0 <0.01
Buprofezin 3 (6%) 0.69 0 <0.01 0 <0.01
Carbosulfan 0 <0.01 0 <0.01 1 (5%) 0.14
Carboxin 1 (2%) 0.03 0 <0.01 0 <0.01
Chlorantraniliprole 3 (6%) 0.03 2 (10%) 0.02 0 <0.01
Chlorfenapyr 2 (4%) 0.04 0 <0.01 0 <0.01
Chloridazon 1 (2%) 0.02 0 <0.01 0 <0.01
Chlorothalonil 3 (6%) 0.12 1 (5%) 2.00 3 (15%) 3.50
Chlorpyrifos 0 <0.01 0 <0.01 2 (10%) 0.31
Clofentezine 12 (24%) 15.30 0 <0.01 0 <0.01
Cyflufenamid 1 (2%) 0.01 0 <0.01 0 <0.01
Cyfluthrin 3 (6%) 0.39 0 <0.01 0 <0.01
Cyhalothrin 6 (12%) 2.40 0 <0.01 0 <0.01
Cypermethrin 6 (12%) 0.92 0 <0.01 0 <0.01
Cyprodinil 31 (62%) 7.40 0 <0.01 0 <0.01
Deltamethrin 1 (2%) 0.22 0 <0.01 6 (30%) 1.30
Diazinon 2 (4%) 0.05 0 <0.01 0 <0.01
Dicofol 1 (2%) 1.00 0 <0.01 0 <0.01

Int. J. Environ. Res. Public Health 2016,13, 943 7 of 14
Table 6. Cont.
Active Substances
Detected in the Samples
Roses Gerberas Chrysanthemums
Number of
Detections
(out of 50)
(Frequency)
Maximum
Concentration
(mg/kg)
Number of
detections
(out of 20)
(Frequency)
Maximum
Concentration
(mg/kg)
Number of
Detections
(out of 20)
(Frequency)
Maximum
Concentration
(mg/kg)
Difenoconazole 4 (8%) 0.02 0 <0.01 0 <0.01
Dimethoate 2 (4%) 0.33 0 <0.01 0 <0.01
Dimethomorph 17 (34%) 1.90 0 <0.01 0 <0.01
Dinotefuran 2 (4%) 2.10 0 <0.01 0 <0.01
Dodemorph 37 (74%) 41.90 2 (10%) 0.02 0 <0.01
Ethirimol 13 (26%) 0.36 0 <0.01 0 <0.01
Etoxazole 3 (6%) 1.20 0 <0.01 3 (15%) 1.60
Etridiazole 0 <0.05 0 <0.05 7 (35%) 3.50
Famoxadone 11 (22%) 3.30 1 (5%) 0.04 0 <0.01
Fenamidone 5 (10%) 1.10 1 (5%) 0.02 0 <0.01
Fenamiphos 1 (2%) 3.30 0 <0.01 0 <0.01
Fenarimol 1 (2%) 0.03 0 <0.01 0 <0.01
Fenhexamid 13 (26%) 19.50 0 <0.01 2 (10%) 0.90
Fenpropathrin 0 <0.01 1 (5%) 0.02 0 <0.01
Fenpropidin 2 (4%) 0.02 0 <0.01 0 <0.01
Fensulfothion-Oxon 1 (2%) 0.02 0 <0.01 0 <0.01
Fenvalerate 1 (2%) 0.06 0 <0.01 5 (25%) 1.90
Fipronil 7 (14%) 0.68 0 <0.005 1 (5%) 0.75
Flonicamid 18 (36%) 1.40 11 (55%) 3.30 4 (20%) 0.45
Flubendiamide 3 (6%) 0.28 0 <0.01 0 <0.01
Fludioxonil 19 (38%) 2.00 1 (5%) 0.03 1 (5%) 0.02
Flufenoxuron 1 (2%) 0.02 0 <0.01 0 <0.01
Fluopicolide 15 (30%) 1.60 0 <0.01 0 <0.01
Fluopyram 23 (46%) 12.40 15 (75%) 3.00 4 (20%) 6.40
Forchlorfenuron 1 (2%) 0.19 0 <0.01 0 <0.01
Fosthiazate 1 (2%) 0.02 0 <0.01 0 <0.01
Furalaxyl 2 (4%) 9.90 0 <0.01 0 <0.01
Hexythiazox 3 (6%) 0.16 0 <0.01 0 <0.01
Imidacloprid 21 (42%) 3.00 0 <0.01 3 (15%) 0.93
Indoxacarb 3 (6%) 1.20 2 (10%) 0.16 0 <0.01
Iprodione 20 (40%) 17.40 7 (35%) 0.65 0 <0.01
Iprovalicarb 5 (10%) 5.40 0 <0.01 0 <0.01
Isocarbofos 1 (2%) 0.01 0 <0.01 0 <0.01
Kresoxim-methyl 9 (18%) 1.40 0 <0.01 0 <0.01
Lufenuron 12 (24%) 1.90 0 <0.02 5 (25%) 0.87
Mandipropamid 5 (10%) 6.70 1 (5%) 0.01 1 (5%) 0.02
Mepanipyrim 2 (4%) 5.20 0 <0.01 0 <0.01
Metalaxyl and Metalaxyl-M
5 (10%) 0.29 0 <0.01 1 (5%) 0.02
Methamidophos 14 (28%) 5.40 0 <0.01 1 (5%) 0.57
Methiocarb 1 (2%) 13.60 0 <0.01 4 (20%) 6.00
Methomyl and Thiodicarb 3 (6%) 4.50 0 <0.01 0 <0.01
Methoxyfenozide 9 (18%) 5.20 0 <0.01 1 (5%) 0.02
Metrafenone 5 (10%) 10.30 0 <0.01 0 <0.01
Myclobutanil 1 (2%) 0.13 0 <0.01 0 <0.01
Novaluron 6 (12%) 2.20 0 <0.01 0 <0.01
Oxadixyl 0 <0.01 0 <0.01 2 (10%) 0.03
Oxamyl 1 (2%) 0.01 0 <0.01 0 <0.01
Oxycarboxin 3 (6%) 0.11 0 <0.01 0 <0.01
Paclobutrazol 0 <0.01 1 (5%) 0.01 0 <0.01
Picoxystrobin 2 (4%) 1.80 0 <0.01 0 <0.01
Piperonyl-butoxide 0 <0.01 1 (5%) 0.27 4 (20%) 0.07
Pirimicarb 10 (20%) 0.26 0 <0.01 0 <0.01
Prochloraz 4 (8%) 3.10 0 <0.01 0 <0.01
Procymidone 18 (36%) 35.30 1 (5%) 0.35 0 <0.01
Propamocarb 22 (44%) 35.40 4 (20%) 0.16 0 <0.01
Pymetrozine 6 (12%) 0.56 0 <0.01 1 (5%) 0.03
Pyraclostrobin 7 (14%) 1.30 1 (5%) 0.02 0 <0.01
Pyridaben 1 (2%) 0.08 0 <0.01 0 <0.01
Pyridalyl 1 (2%) 0.01 0 <0.01 0 <0.01
Pyrimethanil 23 (46%) 13.70 0 <0.01 0 <0.01
Quinalphos 1 (2%) 0.05 0 <0.01 0 <0.01
Spinetoram 5 (10%) 0.13 0 <0.01 0 <0.01
Spinosad 9 (18%) 0.58 3 (15%) 0.40 0 <0.01

Int. J. Environ. Res. Public Health 2016,13, 943 8 of 14
Table 6. Cont.
Active Substances
Detected in the Samples
Roses Gerberas Chrysanthemums
Number of
Detections
(out of 50)
(Frequency)
Maximum
Concentration
(mg/kg)
Number of
detections
(out of 20)
(Frequency)
Maximum
Concentration
(mg/kg)
Number of
Detections
(out of 20)
(Frequency)
Maximum
Concentration
(mg/kg)
Spirotetramat 1 (2%) 0.03 3 (15%) 2.30 2 (10%) 0.10
Spiroxamine 34 (68%) 15.00 1 (5%) 0.03 1 (5%) 0.02
Tebuconazole 4 (8%) 5.20 0 <0.01 0 <0.01
Tetradifon 1 (2%) 0.08 0 <0.01 0 <0.01
Thiabendazole 1 (2%) 4.20 0 <0.01 0 <0.01
Thiacloprid 7 (14%) 5.80 0 <0.01 0 <0.01
Thiamethoxam 8 (16%) 4.20 1 (5%) 0.80 17 (85%) 2.20
Thiophanate-methyl 1 (2%) 9.90 2 (10%) 0.02 0 <0.01
Tolclofos-methyl 0 <0.01 0 <0.01 17 (85%) 5.60
Trichlofron 0 <0.02 6 (30%) 0.05 0 <0.02
Trifloxystrobin 2 (4%) 0.09 0 <0.01 1 (5%) 0.03
Triflumizole 3 (6%) 0.54 4 (20%) 0.24 0 <0.01
Triforine 1 (2%) 0.79 0 <0.01 0 <0.01
Among the 90 flower samples analysed, the highest maximum concentrations out of all the
active substances analysed were for dodemorph, propamocarb, and procymidone, with 41.9, 35.4, and
35.3 mg/kg, respectively. Regarding the three species, the highest average concentrations were found:
On roses, for methiocarb, thiophanate-methyl, and furalaxyl (13.60, 9.90 and 8.90 mg/kg, respectively).
On gerberas, for chlorothalonil, flonicamid, and spirotetramat (2.00, 1.71, and 1.37 mg/kg,
respectively). Four of the 30 active substances detected in the 20 gerbera samples present maximum
concentrations of 2 mg/kg and above. Flonicamid and fluopyram present the highest maximum
concentrations, with 3.3 and 3.0 mg/kg, respectively.
On chrysanthemums, for acephate, chlorothalonil, etridiazole, methiocarb, and fluopyram
(1.06, 1.21, 1.52, 1.80, and 2.57 mg/kg, respectively). Eleven of the 31 active substances detected
in the 20 chrysanthemums samples presented maximum concentrations of 1 mg/kg and more.
Tolclofos-methyl, methiocarb, and fluopyram presented the highest maximum concentrations, with
5.6, 6.0, and 6.4 mg/kg, respectively.
3.4. Hazard Characterization: Classification of Active Substances According to Their Toxicity
The risk for workers to develop adverse health effects is the combination of health hazards
(mode of action; acute and chronic toxicity of a.s.) of pesticides with the likelihood of exposure
(concentration levels on flowers; routes of exposure; mitigation measure such as PPE). Both acute and
chronic toxicity are of concern for florists. The biological activity is often linked with the toxicity in
animals and humans. Insecticides are, in general, the most acutely toxic products, whereas fungicides
are considered as less toxic compounds. Many other properties (such as solubility and cutaneous
absorption) may interfere with exposure. Of the 107 detected active substances, most belong to
groups known for their toxicological properties: organophosphates (12 a.s.); pyrethroids (8 a.s.), and
carbamates (7 a.s.) are all pesticides with an action on the nervous system. Since florists are mainly
exposed by the dermal route, it was interesting to consider the classification of all a.s. found on
cut flowers for acute dermal toxicity according to the CLP(Classification, Labelling and Packaging)
Regulation (EC) No. 1272/2008 (Table 7). Most a.s. have a LD
50
>2000 mg/kg bw and are not classified
for that property (86 a.s. of 97 for roses; 27 a.s. of 30 for gerberas; 28 a.s. of 31 for chrysanthemums).
In addition, classification according to CLP regulations for the different health hazards is reported
in Table 8. According to this table, the number of sensitizing active substances detected in the roses,
chrysanthemums, and gerberas were 16, 11, and 12, respectively.

Int. J. Environ. Res. Public Health 2016,13, 943 9 of 14
Table 7.
Number of a.s. detected on cut flowers belonging to each category of acute toxicity hazard for
the dermal route of exposure (CLP classification) [26–31].
Categories LD50 (mg/kg bw) Hazard Wording Roses Gerberas Chrysanthemums
1 (0–50) Fatal in contact with skin 2 - -
2 (50–200) Fatal in contact with skin 1 - -
3 (200–1000) Toxic in contact with skin 3 1 1
4 (1000–2000)
Harmful in contact with skin
5 2 2
Table 8.
Number of active substances detected on the various cut flower species classified in each
hazard category according to CLP regulation (with the corresponding code of hazard (only relevant
categories for florist exposure are listed) [32].
Category Code Roses Gerberas Chrysanthemums
Acute toxicity
Category 1 H310: Fatal in contact with skin 2 - -
Category 2 H300: Fatal if swallowed 10 - 2
H330: Fatal if inhaled 6 2 3
Category 3 H301: Toxic if swallowed 7 2 4
H311: Toxic in contact with skin 2 - 2
H331: Toxic if inhaled 10 1 3
Category 4 H302: Harmful if swallowed 21 7 9
H312: Harmful in contact with skin 7 2 2
H332: Harmful if inhaled 3 4 1
Carcinogenicity
Category 2 H351:Suspected of causing cancer 13 5 4
Serious eye damage/eye irritation
Category 1 H318: Causes serious eye damage 2 1 2
Category 2 H319: Causes serious eye irritation 3 1 1
Germ cell mutagenicity
Category 1, 1A or 1B H340: May cause genetic defects 1 1 -
Category 2 H341: Suspected of causing genetic defects 1 1 -
Reproductive toxicity
Category 1, 1A or 1B H360: May damage fertility or the unborn child 3 3 -
Category 2 H361: Suspected of damaging
fertility or the unborn child 11 5 3
Additional category for
effects on or via lactation H362: May cause harm to breast-fed children 2 - -
Sensitisation of the respiratory tract or the skin
Respiratory sensitizers
Category 1, 1A or 1B
H334: May cause allergy or asthma symptoms or
breathing difficulties if inhaled 1 - 1
Skin sensitizers
Category 1, 1A or 1B H317: May cause an allergic skin reaction 21 13 11
Skin corrosion/irritation
Category 1, 1A or 1B
H314: Causes severe skin burns and eye damage
1 1 -
Category 2 H315: Causes skin irritation 6 3 1
Specific target organ toxicity (single exposure)
Category 3 H335: May cause respiratory irritation 4 3 2
Specific target organ toxicity (repeated exposure)
Category 1 H372: Causes damage to organs through
prolonged or repeated exposure 2 1 1
Category 2 H373: May cause damage to organs through
prolonged or repeated exposure 7 3 3
As the florists handle the flowers every day in the course of their work, the exposure risk is also
chronic. The reference value considered for this category of workers is the AOEL (Acceptable Operator
Exposure Level) [
33
] (Table 9). The AOEL is the maximum amount of a.s. to which the worker (in this
case) may be exposed without any adverse health effect. It is expressed in mg/kg bw/day.

Int. J. Environ. Res. Public Health 2016,13, 943 10 of 14
Table 9.
Number of active substances detected on the three species of cut flowers classified according
to their AOEL values (Source: EU Pesticides Database 2015, European Commission/DGSANCO,
Regulation (EC) 1107/2009) [34].
AOEL Values (mg/kg bw/day) Roses Gerberas Chrysanthemums
(0.001–0.01) 19 3 6
(0.01–0.1) 43 15 13
(0.1–1) 18 9 7
>1 1 - -
No AOEL * 16 3 5
* Active substances which have no AOEL values; not assessed at the European level.
3.5. Lesson Learned from the Florist Observations and Interviews
The great majority (79%) of the questionnaires were filled in by the heads of the businesses.
Fifty-six percent of the 25 Belgian florists interviewed were male. Twenty-four percent of the florists
were aged between 20 and 30 years, 44% between 30 and 50, and 32% were over 50. Sixty-eight percent
of the florists worked alongside other people (employees or family members who are also occasionally
exposed). Florist exposure can arise from their activities and can vary according to the working
time spent on handling cut flowers. According to the survey, they all have similar activities, such as
handling, sorting, pruning, bundling of flowers, and preparation of bouquets. Activities were carefully
observed to be repeated later at the laboratory. Sixty percent of the florists worked between 6 and 7 h a
day (40% more than 8 h). The time spent preparing bouquets and handling flowers vary greatly over
the year, but is always quite high, varying on average from 2 to 6 h a day for 80% of the florists in the
low season, and for 40% of the florists in the high season. This handling time could be in excess of
6 h for 8% of the florists in the low season, but during the high season or special occasions, an intense
working period, 60% spent more than 6 h a day on this work. Only 12% of the florists worked fewer
than 2 h a day in the low season. In addition, the majority of the florists (18 out of the 25 respondents)
worked six or even seven days a week. The others worked five days a week. Regarding the potential
long term exposure of florists, the survey showed that 44% of the respondents had been working as
florists for less than 10 years, but more than 30% had been working as florists for more than 30 years.
With regard to the use of personal protection equipment, 96% of the florists wear no special
clothing. Only 20% of the florists surveyed use occasionally latex gloves when preparing bouquets and
handling flowers. With regard to hygiene practices, 84% wash only their hands after handling flowers;
20% wash their hands and arms, and 8% their hands, arms, and faces after working. Sixty-five percent
wash thoroughly all over after their day’s work. Eighty-eight percent of the florists eat and drink and
12% smoke, during working. None of the florists surveyed use PPP themselves (some used CHRYSAL
®
,
an aluminium sulphate, to lengthen the life of the cut flowers).The main routes of exposure during
post-application activities are dermal and by inhalation [
33
]. Inhalation could be later investigated
because some pesticides are rather volatile and the plants are stored directly on the premises of the
shop where florists are working. This could lead to a significant concentration of active substances
in the air. Oral exposure may also occur secondarily to dermal exposure, through hand to mouth
transfer. However, for workers, maximum potential exposure by this route is generally assumed to be
negligible in comparison with that via the dermal route and by inhalation [
33
]. Sixty percent of the
florists surveyed had not received any information regarding the presence of residual pesticides on
cut flowers. Thirty-six percent of them had received information through the media. Only 4% had
received information from health workers. With regard to health, four subjects declared that they
had eye problems, one declared respiratory problems, and four declared irritations and itching of
the skin. Only one florist mentioned headaches and recurrent tiredness. Of the 25 florists surveyed,
two suffered from cancers, seen had skin allergy problems, and one suffered from thyroid problems.

Int. J. Environ. Res. Public Health 2016,13, 943 11 of 14
4. Discussion
From the results of this survey, cut flowers (roses, gerberas, and chrysanthemums) sold in Belgium
were found to be heavily contaminated by pesticide residues. The first significant result is the overall
contamination of cut flowers. Only a single sample analysed (chrysanthemums from the Netherlands)
was free from detectable residues, rather than 16 (15.2 per cent) of 105 lots that did not contain any
pesticide residues in the study of Morse et al. published in 1979 [
4
]. On the contrary, most active
substances (a.s.) reached high levels of residues, with concentrations between 10 and 50 mg/kg, about
a thousand times above the maximum limit value set for residues in foodstuffs. Sixty percent of flowers
had total pesticide residues >5 mg/kg and 4% had concentrations >50 mg/kg.
The second lesson learned from the analyses is the large number of a.s. detected on flowers.
No fewer than 107 active substances (almost 10 active substances/sample) were detected in the
90 cut flower samples (roses, gerberas, and chrysanthemums) with a total pesticide load average of
15.72 mg/kg per flower sample. The high pesticide levels on cut flowers are apparently bound to
the use of a large number of different pesticides on flowers by growers and can be explained by the
pressure of pests and diseases, the lack of alternative pest control methods, the commercial value of
flowers which should be perfect at harvest, and the absence of maximum residue limits. The analyses
of samples declared of Belgian or Dutch origins reveal the abnormal presence of 15 active substances
which are not authorised for use in the EU. These results should, however, be put into perspective as
we have no firm guarantee of the origin of the samples taken from the retailer premises rather than
from the producers. Nevertheless, the frequency of the presence of active substances not authorised in
the EU is significantly higher in the Belgian samples, regardless of the species involved, which could
be alarming if flowers were produced in Belgium but, generally, the Belgian official controls do not
reflect a misuse of pesticides [35].
Of the three species, roses are the most heavily contaminated by pesticide residues, with an
average total load of active substance per sample of 26.03 mg/kg. No fewer than 97 pesticide residues
were found in the rose samples (on average 13.56 active substances per sample). For chrysanthemums
and gerberas, pesticide residues detected were lower: an average of 6.25 active substances per
chrysanthemum sample and an average of 4.35 active substances per gerbera sample with an average
total load of 1.70 mg/kg. Statistical analysis confirmed that the roses were very significantly more
contaminated than gerberas and chrysanthemums. The cumulated total of all the residues was as high
as 97.03 mg/kg for a single bouquet of five Belgian roses. Clearly, the largest number of different a.s.
and the highest total concentration of residues were detected on the rose samples.
All detected active substances are insecticides (50%) and fungicides (46%), except four growth
regulators and one herbicide. The most frequently detected substances are the fungicides fluopyram
(42 samples out of 90), dodemorph, propamocarb, and procymidone and their residues reached
the highest concentrations on the rose samples (e.g., 41.9 mg/kg for dodemorph). Nevertheless,
a certain number of the active substances detected are highly acutely toxic (acephate, methiocarb,
monocrotophos, methomyl, deltamethrin, etc.) and can generate a direct effect on the nervous system
(e.g., in the case of handling flowers, transfer from the hands to the mouth could cause accidental
poisoning and affect the florist’s health). Even if pesticides are generally less toxic by dermal contact
than by the oral route, people who handle a large number of contaminated flowers daily are exposed
via dermal absorption, especially in the case of fat-soluble pesticides, and subjected to long term effects
on their health. In the study of published by Morse et al. in 1979 [
4
], the insecticide monocrotophos
was also one of the most important contaminants (detected in nine of 105 lots), with residue levels from
7.7 up to 4750 mg/kg. Other toxic insecticides (such as endosulfan and diazinon) were also frequently
detected. Nevertheless, the comparison between active substances detected on flowers in both studies
is poorly relevant as many new active substances are used by growers today with lower dosages.
From the survey of 25 Belgian florists it is concluded that florists may be exposed to residual
deposits from contaminated flowers, especially when preparing bouquets. Contact with foliage may
deposit residues onto the skin of a worker. The exposure is assumed to depend on the task duration

Int. J. Environ. Res. Public Health 2016,13, 943 12 of 14
(h/day) [
33
]. The length of florists’ exposure varies greatly within the year, but remains high regardless
of the season (the working day varies from 2 to 6 h). The task duration of florists, which is an important
factor to consider when building exposure scenarios for a specific group of workers, is lower than
the default value for time of exposure (8 h) in the EFSA Guidance Document 2014 [
24
]. However,
bad habits (eating, drinking, or smoking at work) and the absence of wearing personal protective
equipment of most of the florists could increase the risk of contact with the pesticide residues.
Regarding the effect of residues on the florists’ health in Belgium, it was not possible to conclude
only on the basis of personal feelings and declarations. The Belgian florists are not directly involved
with pesticide handling and spraying. However, analytical results show that they can be exposed
to high levels of residues during handling. According to their answers in the survey, they seem
to be mainly affected by skin allergy problems. Only one had mentioned headaches and recurrent
tiredness. Those observations are consistent with their usual professional practices and toxicological
properties of the compounds (see Tables 7and 8). The survey of Lu in 2005 [
11
] has shown that frequent
contact with residues of pesticide applied on flowers can generate detrimental health effects: workers
who re-entered a recently sprayed area were 20 times more likely to get ill than those who did not.
Moreover, Abell et al. [
20
] demonstrated in 2000 that male fecundity could be decreased after exposure
to pesticides in the manual handling of ornamental flowers in greenhouses.
5. Conclusions
In summary, overall the samples of cut flowers (roses, gerberas, and chrysanthemums) sold in
Belgium contain high pesticide residue levels. Thus, florists who handle a large number of flowers
are exposed daily, with a potential effect on their health. Therefore, to reduce the exposure of florists
to pesticide residues, sensitisation of professionals to better practices and hygiene rules is highly
recommended. The European Regulation on Maximum Residue Limits (Regulation (EC) N
◦
396/2005)
could be extended to the control of pesticide residues on flowers and MRLs (Maximum Residue Limits)
could be set up for flowers to decrease the risk of exposure of florists and the general population.
This survey will be completed later by results of field and laboratory trials to measure the dislodgeable
foliar residues (DFR,
µ
g/cm
2
), the transfer from plant to hands and, finally, to estimate the dermal
exposure of florists to pesticides applied on cut flowers.
Acknowledgments:
The authors would like to express their gratitude to the Ministry of Agriculture and the
Ministry of Research and Higher Education of Tunisia for their financial support. Many thanks go to the Belgian
florists for their kind participation to this study.
Author Contributions:
This research was undertaken as part of khaoula Toumi’s Doctor of Phytopharmacy thesis.
Bruno Schiffers is the promoter of this thesis. All authors contributed significantly to the successful completion
of this research work both intellectually and financially. Accordingly, they conceived and designed the study
plan. Khaoula Toumi conducted sampling, performed the interviews, analyzed the data and wrote the intial
manuscript. Bruno Schiffers guided this study and provided revisions on the manuscript. Christiane Vlemincks
and
Joris van Loco
provided feedback on the manuscript. Finally, all the authors have read and approved the
final manuscript.
Conflicts of Interest: The authors declare no conflict of interest.
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