Spatial and temporal distributions of total and methyl mercury in precipitation in core urban areas, Chongqing, China
文献类型： 外文期刊
第一作者： Wang, Y. M.
作者： Wang, Y. M.;Wang, D. Y.;Peng, Y. L.;Zhao, L.;Zhu, J. S.;Wang, D. Y.;Meng, B.
作者机构：
期刊名称：ATMOSPHERIC CHEMISTRY AND PHYSICS （ 影响因子：5.2； 五年影响因子：5.7 ）
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年卷期：
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收录情况： SCI
摘要： The spatial and temporal distribution patterns of mercury (Hg) in precipitation were investigated in the core urban areas of Chongqing, China. During the period from July 2010 to June 2011, total mercury (THg) and methyl mercury (MeHg) concentrations in precipitation were analysed from three sampling sites. Our results suggested that the volume-weight mean THg and MeHg concentrations in precipitation were 30.67 ng lg1 ~(-1) and 0.31 ng lg1 ~(-1), respectively. The proportion of MeHg in THg ranged from 0.1% to 7.6% with a mean value of 1.3%. THg and MeHg concentrations showed seasonal variations, while the highest THg value was measured in winter. Contrarily, the highest MeHg concentration was observed in autumn. Additionally, a geographically gradual decline of THg concentration in precipitation was observed from the downtown to the suburb, then to the controlled site in the city. 5 mm rainfall might be a threshold for the full wash-out capability. Rainfall above 5 mm may have a diluting effect for the concentrations of THg. Moreover, the current research implies that the coal combustion and motor vehicles could be the dominant sources for Hg in the precipitation.
分类号： P4
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