Passive Sampler를 이용한 환경대기 중 VOC 분석에 관한 연구

A Study on the Ambient VOC Analysis Using Passive Sampler

Recently VOCs become one of the most interesting compounds in the atmospheric environ men t because of its toxicity, carcinogenesis. durability . dispersion characteristics and accumulation in human body with very low level. Also. it was proved that VOCs act as the precursors of oxidants forming. So kinds of analysis methods were recommended and carried out toward the standardization. generally the thermal desorption/GC/MS(or FID) system is recommended as a standard method. Nevertheless. because this method needs an expensive special equipment and continuous maintenance. it makes difficulties to measure spatial distributions of VOCs in ambient air. Therefore in this study we evaluated the passive sampler which were designed as a measuring tool of working area conditions, on the purpose of measuring the spatial distribution or average concentration of VOCs in the ambient air. This study was carried out to estimate the sampling period of passive sampler, to evaluate repeatability. reproducibility of GC/FID analysis results. and to examine calculation procedure. As the results. the sampling period must be satisfied to capture more than 1 ppm (ng/㎕) of VOC in the liquid sample. so at least 7days or more are needed in ambient air sampling. The repeatability and reproducibility which are examined by relative standard deviation(%) with a point of retention time and peak area at within-run and between-run analysis were proved to be suitable. And the calibration method was examined by least square. logarithmic and constant slope method. among these methods the outcome of least square method was superior (r value exceeds 0.998).