Teresa Vera

Teresa Vera
Centro de Estudios Ambientales del Mediterráneo | CEAM · EUPHORE

Chemist

About

36
Publications
4,523
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
494
Citations

Publications

Publications (36)
Article
Full-text available
In early 2020, the COVID-19 pandemic spread globally, and severe measures to control it were implemented. This study investigates the impact of the lockdown on the air quality of three provinces in the Valencia region, eastern Spain, in the years 2015-2020, focusing on particulate matter (PM). A thorough statistical analysis using different approac...
Article
Full-text available
Multi-oxygenated volatile organic compounds are important markers of air pollution and precursors of ozone and secondary aerosols in both polluted and remote environments. Herein, their accurate determination was enhanced. The approach was based on an automated system for active sampling and on-fibre derivatization coupled with the gas chromatograp...
Article
Full-text available
This paper provides scientific results from a European LIFE project carried out in the Valencian region of Spain during the 2017 to 2018 time frame. In 2018, more than 60,000 tons of pesticides were commercialized in Spain, with approximately 15% destined for Valencian crops. In order to improve the air quality in the agricultural areas of this reg...
Article
Full-text available
Photolysis is one the main drivers in atmospheric chemistry. Volatile organic compounds that bear one or more carbonyl functions can absorb UV light between 295 nm and 450 nm, enabling them to possibly photolyze in the atmosphere. Yet, very few data are available regarding the impact of such photolysis processes on the fate of multifunctional carbo...
Preprint
Full-text available
Multi-oxygenated volatile organic compounds are important markers of air pollution and precursors of ozone and secondary aerosols in both polluted and remote environments. Herein, their accurate determination was enhanced. The approach was based on an automated system for active sampling and on-fiber derivatization coupled with GC-MS technique. The...
Article
Full-text available
Criegee Intermediates (CI), formed in the ozonolysis of alkenes, play a central role in tropospheric chemistry as an important source of radicals, with stabilised CI (SCI) able to participate in bimolecular reactions, affecting climate through the formation of inorganic and organic aerosol. However, total SCI yields have only been determined for a...
Article
Full-text available
The gas-phase atmospheric degradation of prosulfocarb (a widely used thiocarbamate herbicide in winter cereals) at different NOx concentrations was investigated at the large outdoor European Photoreactor (EUPHORE) in Valencia, Spain. Photolysis under sunlight conditions and reaction with ozone were shown as unimportant. The rate constant for the re...
Article
The gas phase atmospheric degradation of pirimiphos-methyl (a widely used organophosphate insecticide and acaricide in many European regions) has been investigated at the large outdoor European Photoreactor (EUPHORE) in Valencia, Spain. Its photolysis has been studied under sunlight conditions and its reaction rate constant with OH radicals was mea...
Article
Full-text available
Several experiments were performed in the European Photo-reactor - EUPHORE - for studying aerosol formation from organophosphorus pesticides such as diazinon, chlorpyrifos, chlorpyrifos-methyl and pirimiphos-methyl. The mass concentration yields obtained (Y) were in the range 5 - 44% for the photo-oxidation reactions in the presence and the absence...
Article
Full-text available
The atmospheric particulate matter has a large impact on climate, biosphere behaviour and human health. Its study is complex because of large number of species are present at low concentrations and the continuous time evolution, being not easily separable from meteorology, and transport processes. Closed systems have been proposed by isolating spec...
Article
Secondary organic aerosol (SOA) is well known to have adverse effects on air quality and human health. However, the dynamic mechanisms occurring during SOA formation and evolution are poorly understood. The time resolved SOA composition formed during the photo-oxidation of three aromatic compounds, methyl chavicol, toluene and 4-methyl catechol, we...
Article
The phosphorothioate structure is highly present in several pesticides. However, there is a lack of information about its degradation process in air and the secondary pollutants formed. Herein, the atmospheric reactions of chlorpyrifos, one of the most world-used insecticide, and its main degradation product - chlorpyrifos-oxon - are described. The...
Article
Full-text available
The α-dicarbonyl compounds glyoxal (CHOCHO) and methyl glyoxal (CH3C(O)CHO) are produced in the atmosphere by the oxidation of hydrocarbons and emitted directly from pyrogenic sources. Measurements of ambient concentrations inform about the rate of hydrocarbon oxidation, oxidative capacity, and secondary organic aerosol (SOA) formation. We present...
Article
The phosphorothioate structure is highly present in several organophosphorus pesticides. However, there is insufficient information about its degradation process after the release to the atmosphere and the secondary pollutants formed. Herein, the atmospheric reaction of chlorpyrifos-methyl (o,o-dimethyl o-(3,5,6-trichloropyridin-2-yl) phosphorothio...
Article
The OH initiated oxidation of chlorpyrifos (a widely used insecticide) and its photooxidation product chlorpyrifos- oxon were investigated at the large outdoor European Photoreactor (EUPHORE). The rate constants for reaction of chlorpyrifos and chlorpyrifos oxonwith OH radicals weremeasured using a conventional relative rate method. The value of th...
Article
Full-text available
The α-dicarbonyl compounds glyoxal (CHOCHO) and methyl glyoxal (CH3C(O)CHO) are produced in the atmosphere by the oxidation of hydrocarbons, and emitted directly from pyrogenic sources. Measurements of ambient concentrations inform about the rate of hydrocarbon oxidation, oxidative capacity, and secondary organic aerosol (SOA) formation. We present...
Conference Paper
Full-text available
With the aim of characterizing the main air pollutants (anthropogenic, biogenic and secondary reaction products) present in the Mediterranean coast of the Iberian Peninsula under different meteorological conditions (summer and winter) two field campaigns (February and June 2011) were performed in the context of the MODELISMOS project (Modelling and...
Conference Paper
Full-text available
Within the MODELISMOS project (Modelling and analysis of mesometeorological processes on transport and accumulation of pollutants in the Western Mediterranean and their influence on chemical degradation mechanisms) two different campaigns, the first one in winter-(February 2012) and the second one in summer (September 2012), were carried out at the...
Article
The gas-phase degradation of ethalfluralin, N-ethyl-α,α,α-trifluoro-N-(2-methylallyl)-2,6-dinitro-p-toluidine, a widely used herbicide, was investigated under atmospheric conditions at the large outdoor European simulation chamber (EUPHORE) in Valencia, Spain. The photolysis of ethalfluralin was investigated under solar radiation and the mean photo...
Article
The oxidation of volatile organic compounds (VOCs) leads to formation of ozone and SOA, with consequences for air quality, health, crop yields, atmospheric chemistry and radiative transfer. Recent observations have identified Methyl Chavicol ("MC": Estragole; 1-allyl-4-methoxybenzene, C10H12O) as a major BVOC above pine forests in the USA, and oil...
Conference Paper
Full-text available
Pollutants are emitted into the troposphere as a result of human activity and natural sources. Once emitted, these compounds undergo physical and chemical changes that result in the formation of other secondary pollutants that may be even more harmful than their predecessors. These transformations are strongly affected by the meteorological conditi...
Conference Paper
Full-text available
Field measurements give on-site information about the state of the atmosphere under certain meteorological conditions on a specific time and location. But the atmosphere is a highly complicated reactive system on which many processes (transport, accumulation of pollutants, deposition, chemical reaction, etc) affected by weather conditions happen at...
Article
The gas-phase degradation of propachlor (2-chloro-N-isopropylacetanilide), a widely used herbicide, was investigated under atmospheric conditions at the large outdoor European simulation chamber (EUPHORE) in Valencia, Spain. The rate coefficient for the reaction of hydroxyl radicals with propachlor was measured using a conventional relative rate te...
Article
The gas phase atmospheric degradation of diazinon has been investigated at the large outdoor European Photoreactor (EUPHORE) in Valencia, Spain. The rate constant for reaction of diazinon with OH radicals was measured using a conventional relative rate method with di-n-buthylether as reference compound being k = (3.5 ± 1.2) × 10⁻¹¹ cm³ molecule⁻¹ s...
Article
The gas-phase degradation of hymexazol (5-methylisoxazol-3-ol), a widely used fungicide, was investigated under atmospheric conditions at the European Photoreactor (EUPHORE) in Valencia, Spain, a large outdoor simulation chamber. The rate coefficient for the reaction of hydroxyl radicals with hymexazol was measured using a conventional relative rat...
Article
The gas-phase atmospheric degradation of chlorpyrifos-methyl (a widely used organophosphate insecticide in Southern European regions) has been investigated at the large outdoor European Photoreactor (EUPHORE) in Valencia, Spain. Photolysis under sunlight conditions and reaction with ozone were shown to be unimportant. The rate constant for reaction...
Article
An experimental investigation on the photolysis of the pesticide chloropicrin (trichloronitro methane CCl3NO2) under atmospheric conditions was carried out at the outdoor European Photoreactor (EUPHORE) in Valencia Spain The photodissociation rate coefficient J(obs)(CCl3NO2) was determined directly under sunlight conditions during spring and summer...
Chapter
Full-text available
The atmospheric fate of pesticides can be studied at the large outdoor European simulation chamber (EUPHORE) in Valencia, Spain. The reactions that can be carried out at EUPHORE (European PHOtoREactor) include photolysis using natural sunlight, OH, NO 3 and ozone initiated oxidation reactions. The EUPHORE facility is up to the moment, one of the be...

Network

Cited By

Projects

Projects (3)
Project
The general objective of the project is to demonstrate the reduction of the environmental contamination of pesticides and their metabolites in the air using Optimal Volume Rate Adjustment tools (OVRA) and drift reducing tools (SDRT) which will lead to a decrease of the pesticide risk for fauna, flora and humans. Besides a new ultra-fast, sensitive and time resolved technology for the analysis of pesticides will be developed to assess the application of pesticides from a health standpoint, in real agricultural conditions.
Project
The aim of the LIFE PHOTOCITYTEX project is to assess the effectiveness of using TiO2-based photocatalytic nanomaterials in building textiles as a way of improving air quality in urban areas. Moreover, information on secondary products formed during the tests will be obtained, yielding a better overall understanding of the whole process and its implications
Project
To investigate the atmospheric behaviour of certain pesticides commonly used in agriculture, Determination of half-life times in the atmosphere and degradation products The characterization of particulate matter and other secondary compounds generated by the chemical transformations of pesticides, and their interaction with other pollutants in the atmosphere Evaluation of the distribution between the gas and the particulate phase by applying theoretical models and validation with experimental data Assessment of population exposure to pesticides by inhalation and risk characterization Establishment of reference levels and / or security settings, which may serve to set a maximum limit on the European Air Quality Programs, and to standardize the environmental control by elaborating normalized protocols for the capture, analysis and interpretation of results