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热脱附法快速分析大气细颗粒物中非极性有机物
摘要点击 148  全文点击 56  投稿时间:2018-01-31  修订日期:2018-04-18
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中文关键词  非极性有机物  热脱附  细颗粒物(PM2.5)  化学组成  来源分析
英文关键词  non-polar organic compounds  thermo-desorption  fine particle (PM2.5)  chemical composition  source analysis
作者单位E-mail
马英歌 上海市环境科学研究院, 上海 200233
国家环境保护城市大气复合污染成因与防治重点实验室, 上海 200233 
mayg@saes.sh.cn 
吴霞 上海市环境科学研究院, 上海 200233
国家环境保护城市大气复合污染成因与防治重点实验室, 上海 200233
上海大学环境与化学工程学院, 上海 200444 
 
彭梦梦 上海市环境科学研究院, 上海 200233
国家环境保护城市大气复合污染成因与防治重点实验室, 上海 200233
上海大学环境与化学工程学院, 上海 200444 
 
冯加良 上海大学环境与化学工程学院, 上海 200444  
郁建珍 香港科技大学化学系, 香港  
乔利平 上海市环境科学研究院, 上海 200233
国家环境保护城市大气复合污染成因与防治重点实验室, 上海 200233 
 
周敏 上海市环境科学研究院, 上海 200233
国家环境保护城市大气复合污染成因与防治重点实验室, 上海 200233 
 
朱书慧 上海市环境科学研究院, 上海 200233
国家环境保护城市大气复合污染成因与防治重点实验室, 上海 200233 
 
李莉 上海市环境科学研究院, 上海 200233
国家环境保护城市大气复合污染成因与防治重点实验室, 上海 200233 
lily@saes.sh.cn 
中文摘要
      本研究改进了传统有机样品前处理步骤,将大气细颗粒物样品直接装填于TD管并与气相色谱联用的自动化热脱附装置,建立的新型热脱附(thermo desorption,TD)与气相色谱/质谱(GC/MS)联用方法,对72种非极性有机物(non-polar organic compounds,NPOCs),包括34种多环芳烃(polylicycle aromatic hydrocarbon,PAHs)、1种苯并噻吩、27种(C10~C34)烷烃(alkanes)、5种霍烷(hopanes)和5种甾烷(steranes)化合物进行定量分析.优化了承载样品装填方式、热脱附条件和进样模式等参数.结果表明,热脱附-气相色谱/质谱方法对多环芳烃、正构烷烃、霍烷和甾烷的检出限分别为0.01~1.0、0.1~8.0和0.50~2.0 ng·m-3,标定曲线线性相关系数在0.9以上.热脱附效率分别为:多环芳烃95%~100%、正构烷烃81%~100%、霍烷和甾烷83.1%~100%.与传统溶剂超声萃取的方法差异性比较结果表明,两种方法分析结果的偏差基本小于30%,在可接受范围内.对临安和上海PM2.5中的痕量NPOCs的定量分析表明,采样期间两地大气PM2.5中NPOCs以烷烃为主,其次为PAHs.特征比值法分析结果表明,大气细颗粒物污染主要来自化石燃料燃烧和煤炭燃烧.
英文摘要
      Non-polar organic compounds (NPOCs) associated with PM2.5 in the atmosphere were analyzed by automated thermo-desorption (TD) coupled with gas chromatography/mass spectrometry (TD-GC/MS). The analyses for a total of 72 NPOCs were reviewed, including 34 PAHs, one Debenzothiophene, 27 alkanes (C10-C34), 5 hopanes and 5 steranes. Through this improved TD method, operation of filter loadings, TD condition and sample introduction were optimized. The MDL were 0.01-1.0, 0.1-8.0 and 0.50-2.0 ng·m-3 for PAHs, alkanes, hopanes and steranes, respectively. Calibration curve linearities were above 0.9 for all compounds. The TD efficiencies were 95%-100% for PAHs, 81%-100% for alkanes and 83.1%-100% for hopanes and steranes. PM2.5 samples were pretreated by TD and ultrasonic extraction methods separately and analyzed by GC/MS in two laboratories. Results from these two methods were comparable, as the relative biases were less than 30% for most compounds. Analysis results of PM2.5 samples from Linan and Shanghai showed that NPOCs were higher in winter than that in summer. Alkanes were predominant among NPOCs, followed by PAHs. Source analysis by PAH characteristic ratios indicated that fossil fuel burning and coal burning were the main sources of NPOCs in the two sites during the sampling periods.

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