Yang Yongkui, Chen Hong, Wang Dingyong
College of Resources and Environment, Southwest University, Chongqing 400716, People's Republic of China.
Environ Monit Assess. 2009 Sep;156(1-4):479-89. doi: 10.1007/s10661-008-0499-8. Epub 2008 Aug 12.
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 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.
为了研究中国重庆大气汞（Hg）的时空变化，于2006年8月至2007年9月使用俄罗斯Lumex有限公司生产的Lumex多功能汞分析仪RA - 915(+)对气态单质汞（GEM）进行了测量。重庆GEM的平均浓度为6.74±0.37 ng m(-3)，远高于公认的全球背景值（1.5 - 2 ng m(-3)）。不同功能区的GEM浓度有所不同。交通、工业和商业区的GEM浓度分别为7.07±1.04、7.05±0.96和6.71±1.10 ng m(-3)，而教育/娱乐区和自然保护区的GEM浓度分别为6.14±1.30和4.32±1.04，这表明移动车辆和工业源（特别是煤炭燃烧）的汞排放是重庆大气汞的最重要来源。汞的平均浓度也有月度变化，11月最高（8.24±0.50 ng m(-3)），8月最低（5.36±0.70 ng m(-3)）。此外，GEM浓度的日变化取决于当地/区域大气条件。在缙云山站点（自然保护区），白天的每小时GEM浓度远高于夜间。然而，在发电厂站点，白天的每小时GEM浓度低于夜间。除气压外，空气中的GEM浓度与气象参数显著相关。
