低浓度挥发性有机化合物被动式个体采样器的研究

研制了扩散式挥发性有机化合物（ＶＯＣｓ）个体采样器，适用于对环境空气中和非职业性个体接触ＶＯＣｓ的监测。在风速１０～２６０ｃｍ／ｓ，相对湿度为３０％～８０％，温度为１０～３０℃的范围内使用，采样速率分别为苯：２５．７４ｍｌ／ｍｉｎ，甲苯：２５．１６ｍｌ／ｍｉｎ，四氯乙烯：２５．８５ｍｌ／ｍｉｎ，对－二甲苯：８．１６ｍｌ／ｍｉｎ，苯乙烯：６．４７ｍｌ／ｍｉｎ。与主动式活性炭纤维（ＡＣＦ）管采样法比较，本个体采样器测定空气中靶ＶＯＣｓ的总不确定度均在±２５％以内。

Passive personal sampler for exposure to low concentration of volatile organic compounds

A passive personal sampler has been developed for monitoring volatile organic compounds(VOCs) in ambient air and nonoccupational exposure. The sampler collecting target VOCs is based upon the mechanism of molecular diffusion and absorption onto a single layer of active carbon fibre (ACF) absorbent. After exposure, the ACF is transferred from the sampler into stainless steel tubes for thermal desorption. The desorbed target VOCs is analyzed by capillary GC. Under the condition of facing velocity of 10-260 cm/s, relative humidity of 30%-80%, and temperature of 10-30 C, the sampling rate for benzene, toluene, tetrachloroethylene, p-xylene and styrene is 25.74, 25.16, 25.85, 8.16 and 6.47 ml/min respectively. The analysis on the new passive sampler demonstrated that its relative overall uncertainty for target VOCs was in the range of +/- 25% compared with the active ACF tube sampling method.