热脱附-气相色谱质谱法测定固定污染源废气中的73种挥发性有机物

Determination of 73 Volatile Organic Compounds in Exhaust Gas of Stationary Pollution Source by Thermal Desorption-Gas Chromatography-Mass Spectrometry

本研究采用吸附材料适合的吸附管直接采集固定污染源废气中的挥发性有机物(或先用气袋采集,再将气袋中的气体采集到吸附管中),将吸附管置于热脱附仪中脱附,脱附气体经气相色谱分离后,进行质谱检测。方法线性良好,各化合物相关系数均大于0.995。两种不同浓度下测定的相对标准偏差介于1.0%~21.6%,加标回收率介于70.8%~109%,因此热脱附-气相色谱质谱法适用于废气中挥发性有机物的监测。

In this study,an adsorption tube suitable for adsorption material is used to directly collect the volatile organic compounds in the exhaust gas of a stationary pollution source(or first use the air bag to collect first,and then collect the gas in the air bag into the adsorption tube),and the adsorption tube is placed in a thermal desorption apparatus for desorption,after the desorbed gas is separated by gas chromatography,it is detected by mass spectrometry.The method has good linearity,and the correlation coefficient of each compound is greater than 0.995.The relative standard deviations of the two different concentrations are between 1.0%and 21.6%,and the recovery rate of standard addition is between 70.8%and 109%,therefore,thermal desorption-gas chromatography-mass spectrometry is suitable for the monitoring of volatile organic compounds in exhaust gas.