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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
投稿时间:2016-06-06  修订日期:2016-08-17
DOI:10.19316/j.issn.1002-6002.2017.05.21
中文关键词:  热脱附  GC-MS  细颗粒物  甾烷类  藿烷类  有机示踪物
英文关键词:direct thermal desorption  GC-MS  fine particulate matter  steranes  hopanes  organic molecular tracer
基金项目:
作者单位
沈秀娥 北京市环境保护监测中心, 北京 100048;大气颗粒物监测技术北京市重点实验室, 北京 100048 
刘保献* 北京市环境保护监测中心, 北京 100048;大气颗粒物监测技术北京市重点实验室, 北京 100048 
王小菊 北京市环境保护监测中心, 北京 100048;大气颗粒物监测技术北京市重点实验室, 北京 100048 
常淼 北京市环境保护监测中心, 北京 100048;大气颗粒物监测技术北京市重点实验室, 北京 100048 
董瑞 北京市环境保护监测中心, 北京 100048;大气颗粒物监测技术北京市重点实验室, 北京 100048 
张琳 北京市环境保护监测中心, 北京 100048;大气颗粒物监测技术北京市重点实验室, 北京 100048 
石爱军 北京市环境保护监测中心, 北京 100048;大气颗粒物监测技术北京市重点实验室, 北京 100048 
通讯作者:刘保献*  北京市环境保护监测中心, 北京 100048;大气颗粒物监测技术北京市重点实验室, 北京 100048  
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中文摘要:
      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 m3时,各目标化合物的检出限为0.008~0.084 ng/m3,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。
英文摘要:
      A fast direct thermal desorption-GC-MS method for determination of organic molecular tracer such as steranes and hopanes in PM2.5 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 of 79.1%-112.9%,the precision was less than 13.2%. Otherwise, When the sampling volume was 24 m3,the limit detection of the target compounds was 0.008-0.084 ng/m3, indicated that the method has very low detection limit.The actual samples of PM2.5, 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.
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