Evaluation of Thermal Desorption Type Diffusion Sampler for Determination of VOCs in Ambient Air
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概要
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Performance of a thermal desorption type diffusion sampler was evaluated for determination of volatile organic compounds (VOCs) such as toluene, ethylbenzene, xylene, styrene, p-dichlorobenzene and limonene in a small chamber. The diffusion sampler consists of porous polyethylene tube uniformly packed with carbon molecular sieves as a collection media. In addition to the previous white colored porous tube, black colored one, to which graphite powders was blended, was also used in this study. As an active sampler, Tenax TA tube was employed, and was connected to an air suction pump. Both passive and active samplers were simultaneously exposed to prepared VOC gases in the chamber for 2 hours. Collected VOCs were then thermally desorbed, transferred by a carrier gas and determined by a capillary gaschromatography using flame ionization detector (GC-FID) . The chamber experiments showed that Henry's adsorption isotherm could be applied to relationships between collected amounts of each VOC by diffusion sampler and air concentrations measured by active sampling method in the case of measuring Japanese Indoor Air Guideline levels. Then, we derived uptake rates of each VOC from slopes of linear regressions, to convert the VOCs amount on the passive sampler to air concentration. The uptake rates did not show temperature dependence in the range of 10-40°C . Relative humidity also had no influence on the collection efficiency of the diffusion sampler from 47% to 94% at 20°C. In a field sampling test, indoor air concentrations of VOCs measured by the diffusion sampler agreed to those by the active device, using derived uptake rates of each VOC.
- 日本環境化学会の論文
日本環境化学会 | 論文
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