直接进样-热脱附-GC-MS快速测定大气细颗粒物中有机示踪物  

A Rapid Direct Thermal Desorption-GC-MS Method for Determination of Organic Molecular Tracer in Atmospheric Fine Particulate Matter

作　　者：沈秀娥[1,2] 刘保献 王小菊[1,2] 常淼 董瑞[1,2] 张琳 石爱军[1,2] SHEN Xiu＇e LIU Baoxian WANG Xiaoju CHANG Miao DONG Rui ZHANG Lin SHI Aijun(Beijing Municipal Environmental Monitoring Centre ,Beijing 100048 ,China Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology, Beijing 100048,China)

机构地区：[1]北京市环境保护监测中心,北京100048 [2]大气颗粒物监测技术北京市重点实验室,北京100048

出　　处：《中国环境监测》2017年第5期147-153,共7页Environmental Monitoring in China

摘　　要：建立了直接进样-热脱附-GC-MS快速测定细颗粒物中甾烷类和藿烷类有机示踪物的方法。经实验条件优化,13种目标化合物的线性回归方程的相关系数均在0.990以上,空白加标回收率为81.4%~102.3%,实际样品加标回收率为79.1%~112.9%,相对标准偏差小于13.2%。当采样体积为24 m^3时,各目标化合物的检出限为0.008~0.084 ng/m^3,方法灵敏度高。利用该方法测定了北京城区采暖季和非采暖季PM2.5实际样品,结果表明:各目标物均有检出,且采暖季的甾烷类和藿烷类化合物的总量均明显高于非采暖季。该方法无需复杂的前处理和有机溶剂,操作简便快捷,在颗粒物中非极性化合物的快速检测方面具有很大的应用价值。A fast direct thermal desorption-GC-MS method for determination of organic molecular tracer such as steranes and hopanes in PM（2. 5） has been established. In order to acquire the best conditions,various parameters were studied in this paper,Results showed that the correlation coefficient of 13 organic molecular tracer were all above 0. 990,the recovery of the target compounds in blank quartz filters was in the range of 81. 4%-102. 3%,and the recovery of actual sample was in the range of79. 1%-112. 9%,the precision was less than 13. 2%. Otherwise,When the sampling volume was 24 m-3,the limit detection of the target compounds was 0. 008-0. 084 ng/m-3,indicated that the method has very low detection limit. The actual samples of PM（2. 5）,collected in heating season and non-heating season of Beijing,were determined by this method. The results showed that the target compounds were detected,and the total of steranes and hopanes in heating season were significantly higher than the non-heating season. This method is simple and fast,and has great application value in the rapid detection of non polar compounds in the particulate matter without complicated pretreatment and organic solvent.

关 键 词：热脱附 GC-MS 细颗粒物 甾烷类 藿烷类 有机示踪物 

分 类 号：X830.2[环境科学与工程—环境工程]