罐采样-冷阱富集气相色谱质谱联用测定空气中挥发性有机物

摘要

采用罐采样-冷阱富集气相色谱质谱联用技术测定空气中的VOCs，优化了升温程序、进样体积等分析条件。实验结果表明，39种目标化合物在0～10.0ppbv范围内线性良好，检出限范围为0.038～0.460ppbv，即0.15μg/m3～3.09μg/m3，标准气体平行测定的相对标准偏差为1.0％～5.5％。应用于环境等空气样品的测定，操作分析简便，目标化合物的分离效果较好。%The pollution problem of volatile organic compound (VOCs)has become quite prominent now.The harm of VOCs to human body has received much attention.Therefore,it’ s important to monitor VOCs accurately. SUMMA canister sampling-cold trapping and gathering gas chromatography mass spectrometry method was estab-lished to monitor the VOCs in air.The temperature program and sampling volume were optimized firstly.The exper-imental results indicated that 39 kinds of target compounds showed a good linearity in the range of 0~10.0ppbv. Detection limits ranged from 0.038~0.460ppbv,that is 0.15μg/m3 to 3.09μg/m3.Standard gas parallel determi-nation of RSD was 1.0%~5.5%.This method was simple to be applied to determine the ambient air sample.The target compounds can be separated well using this method as well.