Spatial and temporal distribution of gaseous elemental mercury in Chongqing, China

文献类型： 外文期刊

第一作者： Yang, Yongkui

作者： Yang, Yongkui;Chen, Hong;Wang, Dingyong;Chen, Hong;Wang, Dingyong

作者机构：

关键词： Gaseous elemental mercury (GEM);Atmospheric mercury;Variation;Distribution

期刊名称：ENVIRONMENTAL MONITORING AND ASSESSMENT （ 影响因子：2.9； 五年影响因子：3.1 ）

ISSN： 0167-6369

年卷期： 2009 年 156 卷 1-4 期

页码：

收录情况： SCI

摘要： In order to investigate the spatial and temporal variability of atmospheric mercury (Hg) in Chongqing, China, gaseous elemental mercury (GEM) was measured from August 2006 to September 2007, using Lumex(A (R)) multifunctional mercury analyzer RA-915(+) (Lumex Ltd., Russia). The mean GEM concentration was 6.74 +/- 0.37 ng m(-3) in Chongqing, much higher than the accepted global background values (1.5-2 ng m(-3)). The GEM concentrations were different in different function areas. GEM in transport, industrial and commercial areas were 7.07 +/- 1.04, 7.05 +/- 0.96 and 6.71 +/- 1.10 ng m(-3), respectively, while GEM was 6.14 +/- 1.30 and 4.32 +/- 1.04 in the educational/recreational and nature conservation areas, suggesting that Hg emissions from mobile vehicles and industrial sources (specially coal combustion) were the most important contributors to atmospheric Hg in Chongqing. Mean Hg concentrations also had monthly variations with highest in November (8.24 +/- 0.50 ng m(-3)) and lowest values in August (5.36 +/- 0.70 ng m(-3)). Additionally, the diurnal variation of GEM concentrations was dependent on the local/regional atmospheric conditions. At Jinyun Mountain site (natural conservation area), hourly GEM concentrations had much higher values in daytime than at night. At Power Plant site, however, the hourly GEM concentrations were lower in daytime than at night. GEM concentrations in the air were correlated significantly with meteorological parameters except for barometric pressure.

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