气袋采样/气相色谱-质谱法测定固定污染源废气中VOCs

GC-MS Determination of VOCs in Stationary Source Emission With Air Bag Sampling

利用气袋采样/气相色谱-质谱法对固定污染源废气中24种挥发性有机物(VOCs)进行了测定。结果表明:优化条件下,在5.00~100 ng浓度范围内线性关系良好,24种组分相关系数范围为0.9990~0.9999;当进样体积为300mL时,24种VOCs的检出限范围为0.001~0.007 mg/m 3;2种不同浓度空白加标样的相对标准偏差(RSD)范围为0.32%~13.2%;加标回收率为92.0%~112.0%。用建立的方法分析了盐城市某企业污染源废气VOCs,结果显示:该样品中共检出丙酮、乙酸乙酯、甲苯、乙酸丁酯、乙苯、对/间-二甲苯、邻二甲苯、2-庚酮、苯甲醚、苯甲醛、2-壬酮等14种VOCs。

The determination of 24 volatile organic compounds in stationary source emission was carried out by gas chromatograph-mass spectrometer by sampling with air bag.Under the optimized conditions,the linear relationship was good in the concentration range of 5.00~100 ng.The correlation coefficient of each component was all above 0.9990.When the injection volume was 300 mL,the detection limits of 24 VOCs was between 0.001~0.007 mg/m 3.The relative standard deviation(RSD)range of two blank spiked samples with different concentrations was 0.32%~13.2%,and the spike recovery was 92.0%~112.0%.The method was used to analyze the VOCs of the pollution source exhaust gas of an enterprise in Yancheng City.The results showed that a total of 14 VOCs were detected such as acetone,ethyl acetate,toluene,butyl acetate,ethylbenzene,p/m-xylene,o-xylene,2-heptane ketone,anisole,benzaldehyde,2-nonanone,etc.