Temporal trends of polychlorinated biphenyls in precipitation in Beijing, China
Temporal trends of polychlorinated biphenyls in precipitation in Beijing, China
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中国北京降水中多氯联苯的时间变化趋势
DOI：
10.1016/j.atmosenv.2012.03.070
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发表时间：
2012-09
影响因子：
5
通讯作者：
ou Xu,Liyan Liu,Hongliang Jia,Yang Chen,Yongbao Zh
中科院分区：
文献类型：
--
作者：
Guosheng Yang,Lingling Ma,Di;ou Xu,Liyan Liu,Hongliang Jia,Yang Chen,Yongbao Zh
2009年2月- 2011年3月首次测定了北京地区降水中多氯联苯（PCBs）的时间变化趋势，并计算了月沉积通量。总多氯联苯浓度范围为溶解相7.00 ~ 993 ng L−1in，颗粒相1.00 ~ 133 ng L−1in，变化幅度为两个数量级。多氯联苯以溶解相为主，占降水中总多氯联苯的82.5%，说明雨水中多氯联苯的富集是由于高污染气相和易吸附城市大气中有机污染物的不可过滤亚微米颗粒被有效清除所致。雪中多氯联苯的浓度最高，约为雨水的两倍，表明雪对多氯联苯的清除效率更高。二氯、三氯和四氯同系物的总和占降水中PCB总量的70.5%，表明PCB主要来自于国内PCB产品的历史使用，如三氯联苯。溶解态和颗粒态多氯联苯浓度下降速度较慢，半衰期为16.9年，表明北京市大气中多氯联苯浓度下降缓慢。∑PCBs湿沉降通量为0.240 ~ 6.55 μg m−2month−1（平均值为1.41 μg m−2month−1），表明北京市大气中PCBs污染程度较高。
Temporal trend of polychlorinated biphenyls (PCBs) was determined in precipitation and monthly depositional fluxes were calculated in Beijing for the first time from February 2009 to March 2011. Total PCBs concentrations ranged from 7.00 to 993 ng L−1in dissolved phase and from 1.00 to 133 ng L−1in particulate phase, with a two orders of magnitude variation. Concentrations of PCBs were dominated by dissolved phase, which accounted for 82.5% of the total PCBs in precipitation, implying PCBs enrichment in rainwater due to efficient scavenging of highly contaminated gas phase and nonfilterable submicron particles which easily adsorbed organic contaminants in urban atmosphere. Highest concentrations of PCBs were measured in snow, which were about two times higher than those in rainwater, demonstrating more efficient scavenging of PCBs by snow. The sum of bi-, tri- and tetrachlorinated congeners accounted for 70.5% of total PCBs in precipitation, suggesting that PCBs mainly come from the historical usage of domestic PCB product, e.g., trichlorobiphenyl. PCBs concentrations in both dissolved and particulate phases showed slow rate of decline, with a half-life of 16.9 years in precipitation, suggesting that the atmospheric concentrations of PCBs were decreasing slowly in Beijing. The wet deposition flux of ∑PCBs ranged from 0.240 to 6.55 μg m−2month−1(mean: 1.41 μg m−2month−1), indicating a relatively high level of PCBs contamination in Beijing atmosphere.
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DOI：
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发表时间：
2007
期刊：
China Environmental Science
影响因子：
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作者：
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通讯作者：
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DOI：
10.1016/0960-1686(91)90075-i
发表时间：
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期刊：
Atmospheric Environment. Part A. General Topics
影响因子：
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作者：
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DOI：
10.1016/j.scitotenv.2010.04.048
发表时间：
2010-08
期刊：
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影响因子：
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