Atmos. Chem. Phys. Discuss., 12, 10243-10272, 2012
© Author(s) 2012. This work is distributed
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Spatial and temporal distributions of total and methyl mercury in precipitation in core urban areas, Chongqing, China
Y. M. Wang1, D. Y. Wang1,2, B. Meng3, Y. L. Peng1, L. Zhao1, and J. S. Zhu1
1Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment (Ministry of Education), College of Resources and Environment, Southwest University, Chongqing 400715, China
2Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400716, China
3State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China

Abstract. The spatial and temporal distribution patterns of mercury (Hg) in precipitation were investigated in the core urban areas of Chongqing, China. During the period form July 2010 to June 2011, total mercury (THg) and methyl mercury (MeHg) concentrations in precipitation were analyzed from three sampling sites. Our results suggest that the volume-weight mean THg and MeHg concentrations in precipitation were 30.67 ng l−1 and 0.31 ng l−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 city center to the suburb, then to the exurb. 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 Hg. Moreover, the current research implies that the coal combustion and motor vehicles could be the dominant sources for Hg in the precipitation.

Citation: Wang, Y. M., Wang, D. Y., Meng, B., Peng, Y. L., Zhao, L., and Zhu, J. S.: Spatial and temporal distributions of total and methyl mercury in precipitation in core urban areas, Chongqing, China, Atmos. Chem. Phys. Discuss., 12, 10243-10272, doi:10.5194/acpd-12-10243-2012, 2012.
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