便携式GC-MS法快速测定固定污染源废气中的VOCs

摘要

采用便携式GC-MS法快速测定固定污染源废气中VOCs,32种VOCs在2×10-7～1 ×10-6范围内线性良好,方法检出限为2×10-9～1 ×10-8,标准气体样品6次测定结果的RSD为1.9％ ～19.1％,环境空气样品的加标回收率为66.2％ ～116％.在实际现场监测固定污染源中VOCs时,使用速查(Survey)功能可初步判断样品浓度,确定稀释倍数.比对试验结果表明,气袋和玻璃注射器采样法对VOCs测定结果无显著性差异.%A portable GC-MS method was established for rapid determination of VOCs in exhaust gases from stationary sources.32 kinds of VOCs had good linearity in (2 × 10-7 ～ 1 × 10-6) volume fraction.The method detection limits were in the range of 2 × 10-9 to 1 × 10-8.The RSD of calibration gases by 6 duplicate measurements were from 1.9％ to 19.1％.A recovery range of 66.2％ ～ 116％ was obtained in ambient air samples.In the actual on-site monitoring of VOCs from stationary sources,the sample concentration could be preliminarily judged by survey function so as to determine the dilution factor.A comparison test showed that there was no significant difference between the sampling methods of air bag and glass syringe.