| 天津市细颗粒物中化学成分及污染水平研究 |
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| 引用本文： | 董海燕,边玮瓅,陈魁.天津市细颗粒物中化学成分及污染水平研究[J].安徽农业科学,2013,41(5):2193-2196. |
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| 作者姓名： | 董海燕 边玮瓅 陈魁 |
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| 作者单位： | 天津市环境监测中心,天津,300191 |
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| 基金项目： | 环保公益性行业科研专项 |
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| 摘 要： | 为研究天津市细颗粒化学组分特征,于2006年8～12月采集PM2.5样品,分析天津市PM2.5中离子、元素碳、有机碳、无机元素等主要化学成分浓度及月变化特征。结果表明,采样期间,天津市PM2.5平均浓度为165.90μg/m3,有机碳(OC)、硫酸盐和地壳元素为其主要化学成分,质量浓度之和占PM2.5的37.0%。SO42-、NO3-、NH4+和Cl-为无机离子的主要成分,占全部无机离子的88.6%。OC/EC平均比值为4.21,冬季二次有机碳污染较重,SOC浓度占OC比例为34.5%。微量元素含量不足检出无机元素总量的10%,Zn、Pb等含量较高,质量浓度分别为623.8和302.3 ng/m3,分别占无机元素总量的3.6%和1.8%,表明机动车尾气和燃煤贡献突出。
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| 关 键 词： | 化学成分 PM2.5 污染水平 天津 |
Study of Chemical Composition and Pollution Level of Fine Aerosol in Tianjin City |
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| Institution: | DONG Hai-yan et al(Tianjin Environmental Monitoring Center,Tianjin 300191) |
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| Abstract: | To investigate the chemical characters of PM2.5,a serial sampling work was made from Aug.to Dec.in 2006 in Tianjin.Concentrations and monthly variation characteristics of water-soluble ions,element carbon(EC),organic carbon(OC) and inorganic elements were determined respectively.The results showed that the average concentration of PM2.5 was 165.90 μg/m3,and OC,SO42-and soil were the main components of PM2.5,accounting for 37.0% of PM2.5,while SO42-,NO3-,NH4+ and Cl-were the dominant water-soluble chemical,accounting for 88.6% of total water soluble ions.The results also showed that the average ratio of OC/EC was 4.21,and secondary organic carbon(SOC) concentration was 13.98 ug/m3,accounting for 34.5% of OC,suggesting that second reaction was more active in winter.Trace elements took less than 10% of the detected elements in concentration,of which Zn and Pb were of high contents,with a concentration of 623.8 and 302.3 ng/m3,accounting for 3.6% and 1.8% of all the elements,which showed that coal burning and engine exhaust may be the main contributor. |
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| Keywords: | Chemical composition PM2 5 Pollution level Tianjin |
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