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Consideration of Measurement Method for SVOCs Emission Rates
Abstract
Semi volatile organic compounds (SVOCs) are used as plasticizers in building materials, interior materials, furniture, consumer electronics. etc. In the home, these SVOCs mix together with house dust. There is thus concern over the health effects of SVOCS in the home, there is a risk that they ini1uence childhood asthma and allergies. It is difficult to measure SVOCs emission rates from building materials or household appliances utilizing the usual test chamber methods, because the boiling points of SVOCs are higher and they are apt to adhere to the surface of the test chamber used. In this study, we introduce FLEC chamber method, passive sampler method and micro chamber method, which are used in Germany and Japan in order to measure SVOCs emission rates. Characteristic, merits and demerits of test methods are also considered.
The purposes of this study were to evaluate the bulk sample concentration and airborne concentrations of phthalate in different types of propellent and triggers in consumer spray products and estimate health risk assessment via inhalation. First, the phthalate concentrations were analyzed in the solutions of all products 174 from markets. Then, among 64 products containing phthalates, 10 propellant-type products were selected that contained high phthalate concentrations; airborne concentrations were measured at distances of 1, 3, and 5 m from the spray nozzle in a clean room. Four phthalates were detected in spray products: diisobutyl phthalate (DiBP), di-n-butyl phthalate (DnBP), butyl benzyl phthalate (BBzP), and bis(2-ethylhexyl) phthalate (DEHP). Among propellant-type products, repellents contained the highest mean concentrations (3.90 ppm), whereas sterilized products contained the lowest mean concentrations (0.59 ppm). Among trigger-type products, cleaning products contained the highest mean concentrations (4.54 ppm), whereas coating products contained the lowest mean concentrations (0.73 ppm). In both propellant- and trigger-type products, DnBP and DEHP exceeded the standard set by the Ministry of Food and Drug Safety of South Korea. No significant patterns were observed for the airborne DiBP, DnBP, and DEHP concentrations at 1, 3, and 5 m (p > 0.05). Children were one of the population groups most susceptible to health risks. Overall, phthalates were detected in both product solutions and the air in consumer spray products; some even exceeded safe limits. Therefore, consumer spray products should be used in well-ventilated areas to avoid respiratory exposure.
This article reviews the papers published in the Korean Journal of Air-Conditioning and Refrigeration Engineering during 2011. It is intended to understand the status of current research in the areas of heating, cooling, ventilation, sanitation, and indoor environments of buildings and plant facilities. Conclusions are as follows. (1) Research trends of thermal and fluid engineering have been surveyed as groups of fluid machinery and fluid flow, thermodynamic cycle, and new and renewable energy. Various topics were presented in the field of fluid machinery and fluid flow. Research issues mainly focused on the rankine cycle in the field of thermodynamic cycle. In the new and renewable energy area, researches were presented on geothermal energy, fuel cell, biogas, reformer, solar water heating system, and metane hydration. (2) Research works on heat transfer area have been reviewed in the categories of heat transfer characteristics, pool boiling and condensing heat transfer, nanofluids and industrial heat exchangers. Researches on heat transfer characteristics included heat transfer above liquid helium surface in a cryostat, methane hydrate formation, heat and mass transfer in a liquid desiccant dehumidifier, thermoelectric air-cooling system, heat transfer in multiple slot impinging jet, and heat transfer enhancement by protrusion-in-dimples. In the area of pool boiling and condensing heat transfer, researches on pool boiling of water in low-fin and turbo-B surfaces, pool boiling of R245a, convective boiling two-phase flow in trapezoidal microchannels, condensing of FC-72 on pin-finned surfaces, and natural circulation vertical evaporator were actively performed. In the area of nanofluids, thermal characteristics of heat pipes using water-based MWCNT nanofluids and the thermal conductivity and viscosity were measured. In the area of industrial heat exchangers, researches on fin-tube heat exchangers for waste gas heat recovery and Chevron type plate heat exchanger were implemented. (3) Refrigeration systems with alternative refrigerants such as , hydrocarbons, and mixed refrigerants were studied. Heating performance improvement of heat pump systems were tried applying supplementary components such as a refrigerant heater or a solar collector. The effects of frost growth were studied on the operation characteristic of refrigeration systems and the energy performance of various defrost methods were evaluated. The current situation of the domestic cold storage facilities was analyzed and the future demand was predicted. (4) In building mechanical system fields, a variety of studies were conducted to achieve effective consumption of heat and maximize efficiency of heat in buildings. Various researches were performed to maximize performance of mechanical devices and optimize the operation of HVAC systems. (5) In the fields of architectural environment and energy, diverse purposes of studies were conducted such as indoor environment, building energy, and renewable energy. In particular, renewable energy and building energy-related researches have mainly been studied as reflecting the global interests. In addition, various researches have been performed for reducing cooling load in a building using spot exhaust air, natural ventilation and energy efficiency systems.
Global phthalate ester production has increased from very low levels at the end of World War II to approximately 3.5 million metric tons/year. The aim of the present study was to investigate potential associations between persistent allergic symptoms in children, which have increased markedly in developed countries over the past three decades, and the concentration of phthalates in dust collected from their homes. This investigation is a case-control study nested within a cohort of 10,852 children. From the cohort, we selected 198 cases with persistent allergic symptoms and 202 controls without allergic symptoms. A clinical and a technical team investigated each child and her or his environment. We found higher median concentrations of butyl benzyl phthalate (BBzP) in dust among cases than among controls (0.15 vs. 0.12 mg/g dust). Analyzing the case group by symptoms showed that BBzP was associated with rhinitis (p = 0.001) and eczema (p = 0.001), whereas di(2-ethylhexyl) phthalate (DEHP) was associated with asthma (p = 0.022). Furthermore, dose-response relationships for these associations are supported by trend analyses. This study shows that phthalates, within the range of what is normally found in indoor environments, are associated with allergic symptoms in children. We believe that the different associations of symptoms for the three major phthalates-BBzP, DEHP, and di-n-butyl phthalate-can be explained by a combination of chemical physical properties and toxicologic potential. Given the phthalate exposures of children worldwide, the results from this study of Swedish children have global implications.
It has been pointed out that phthalic esters have possibility to be endocrine disrupters. In addition to possibility of endocrine disrupters, the indoor air concentration values for dibutyl phthalate (DBF) and dioctyl phthalate (DOP) should be controlled to be less than 220x10^<-6>g/m^3 and 120x10^<-6>g/m^3, respectively, according to the guideline proposed by Ministry of Health, Labor and Welfare. However, there are few available data on the emission rates of the phthalic esters from building materials. In this context, the phthalic esters emitted from wall papers and floor covering sheets made of polyvinyl chloride resin were quantitatively analyzed. The emission at 40℃ was too low to detect the phthalic esters. The emission rates of DOP and di-isononyl phthalate (DINP) from wall papers and floor covering sheets could be measured at 80℃. These data at 80℃ were converted to be from 1.4x10^<-6>g/(m^2・hour) to 5.3x10^<-6>g/(m^2・hour) at 28℃ by consulting with the literature. It is considered that there is little possibility to exceed the indoor air concentration values proposed by the Ministry with the estimated emission rates under normal conditions.
A short summation is given of the deliberations of a WHO working group of experts discussing indoor organic pollutants. The conclusions and recommendations of the working group are presented in full. The complete report on the meeting will be published by the WHO Regional Office for Europe in 1989.
Organophosphorus compounds, which have toxicity to peripheral nerves, are indicated to exist in the atmosphere and indoor environment. However, actual conditions have not been understood sufficiently. This research has developed analytical methods for clarifying the gaseous and particulate forms of these organophosphorus substances in indoor air. Sampling was carried out employing a combination of a quartz filter and a Disk C18 filter with a flow rate of 10 liters/min for 24 hours. It was proved that the quartz filter used in the first stage effectively particulate substances while the Disk C 18 filter at the second stage collected gaseous substances. The organophosphorus compounds in these filters were extracted using acetone, and then analyzed by GC/FPD. The minimum detection levels of these organophosphorus compounds were generally in the range of 0.5-5 ng/m 3 . The described method was applied to determine organophosphorus compounds in indoor air. We found that the indoor levels of particulate matter and gaseous for tributyl phosphate to be 2.5-25.8 ng/m 3 and 8.5-20.2 ng/m 3 , and for tris (2-chloroethyl) phosphate N.D.-6.5 ng/m 3
Phthalate esters are used as plasticizer in many plastics, and several studies have shown their toxicity. Phthalate esters are gradually emitted over time, and so it is conceivable that they pose a significant health risk. This study aims to investigate the temperature dependence of the emissions of various phthalate esters and to estimate the health risks of these emissions at various temperatures. A passive-type sampler was developed to measure the flux of phthalate esters from the surface of plastic materials. With this sampler, we examined three widely used plastic materials: synthetic leather, wallpaper and vinyl flooring. The observed maximum emissions of diethyl phthalate, dibutyl phthalate, and diethylhexyl phthalate (DEHP) from these materials at 20°C were 0.89, 0.77, and 14 μg m−2 h−1, respectively. Emissions at 80°C were 2.8, 4.5×102, and 1.5×103 μg m−2 h−1, respectively. The results showed this temperature dependence is determined primarily by the type of phthalate ester and less so by the type of material. The estimation from the results of temperature dependence indicated the concentration of DEHP in a vehicle left out in the sunshine during the day can exceed the recommended levels of Japan Ministry of Health, Labour and Welfare.
This paper presents measurements on semi-volatile organic compounds (SVOCs) emitted from building materials, household electric appliances, and indoor products. It is extremely difficult to apply the emission test chamber method to the accurate measurement of SVOCs because they are absorbed by the internal walls of the chamber. The authors have reported on the development of the thermal desorption test chamber method that can measure correctly the emission rates of SVOCs emitted from materials under actual room-air temperature conditions. This method is composed of two measurement steps. In the first step we capture organic compounds emitted as gaseous matter. After removing the test piece from the chamber, in the second step we continuously gather the organic compounds absorbed by the chamber's internal walls while heating the chamber. We have used this method to measure emissions from various objects, and have confirmed that most SVOCs are caught in the second step. In this paper, we also report on our verification of the accuracy of SVOC measurements taken using an emission chamber and describe the emission characteristics of SVOCs.
Phthalic acid esters are important additives in polyvinyl chloride (PVC) products. Since PVC plastisoles for the production of wallcoverings contain about 30% phthalic acid esters, it is a crucial question whether these products can contribute to the pollution of the indoor environment. In this study, the emission of several technically relevant phthalates from PVC-coated wallcoverings were measured in emission test chambers under standard room conditions. During a 14-day test period, both the chamber air concentrations and the condensation on a cooled plate (fogging) were determined. In the chamber air, maximum concentrations of 5.1 micrograms/m3 for di-n-butylphthalate (DBP), 2.08 micrograms/m3 for di-pentylphthalate (DPP) and 0.94 microgram/m3 for di-(2-ethylhexyl)phthalate (DEHP) were found. After 14 days of exposure, up to 60.4 micrograms DEHP and 17.7 micrograms DPP could be quantified on the cooled plates of the fogging apparatus. The amounts of DBP and DIBP were significantly lower. A simple exposure calculation indicated no specific risk of an increased phthalate exposure in rooms with PVC wallcoverings.
The emission of di-2-ethylhexyl phthalate (DEHP) from a PVC flooring was studied for up to 472 days in both the FLEC (Field and Laboratory Emission Cell) and the CLIMPAQ (Chamberfor Laboratory Investigations of Materials, Pollution, and Air Quality). The loading of the CLIMPAQs was varied but was constant in the FLECs. The sorption properties of FLEC and CLIMPAQ were investigated using different methods. In addition, the uptake of DEHP by office floor dust on the PVC flooring was studied in CLIMPAQ experiments. The concentration versus time curves in both FLECs and CLIMPAQs increased slowly over about 150 days and reached a quasi-static equilibrium at 1 microg m(-3). The main conclusions were that (i) the emission rate of DEHP was limited by gas-phase mass transport and (ii) the dust layer increased the emission rate by increasing the external concentration gradient above the surface of the PVC. These conclusions were based on the facts that the specific emission rate was inversely proportional to the loading and that the dust had sorbed about four times as much DEHP over a 68-day period as emitted in the gas-phase experiments. About one-half of the emitted DEHP was deposited on the internal surfaces of both the FLEC and the CLIMPAQ.
The main objective of this study was to generate quantitative and qualitative emission data on phthalates from different materials. To achieve this the existing (Chamber for Laboratory Investigations of Materials, Pollution and Air Quality) Climpaq-based procedure for simplified measurements of emissions of plasticizer from PVC and other plasticized materials was modified. It was applied to a range of products. Some of them were suspected of contributing to the indoor concentration of plasticizers. The emissions from PVC flooring, polyolefine flooring, a refrigerator list, two electric cables, PVC skirting and floor wax were studied in separate Climpaqs. The emission from the PVC flooring in the Climpaq was compared with results from the ultra-small chamber Field and Laboratory Emission Cell (FLEC). Sampling and analysis methods were optimized to measure plasticizers. Samples were taken in exhaust air from the chambers after 6, 35, 62, 105, and 150 days from the start of the experiment. PVC flooring was tested for an additional 100 days. Polyolefine covered with wax resulted in an air concentration of 22 microg/m3 of dibutylphthalate (DBP), which is two orders of magnitude larger than any other materials, but did not emit di(2-ethylhexyl)phthalate (DEHP). The other materials resulted in max concentration of approximately 1 microg/m3 of DEHP and low emissions of DBP. The concentration of DEHP in each chamber increased slowly to a rather stable level which was reached after 150 days. DBP concentrations in the chambers with PVC skirting, PVC flooring, polyolefine and floor wax reached their quasi-static equilibrium after 60 days. The modified method did not create sufficient data for the calculation of emission rates. Adsorption of emission on chamber surfaces made it impossible to use the first part of the experiment for emission rate calculation. When the concentration had stabilized, it was found to be almost identical and independent of chamber and ventilation rate. Emission rates were reduced at high concentrations probably because the concentration in the material was near equilibrium with the concentration in the chamber air.
Assessment of organophosphorus pesticide in house dust in agricultural community
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