RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2006, Vol. 15 >> Issue (3): 400-404.

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CONCENTRATION AND FLUXES OF TOTAL MERCURY AT A FOREST CATCHMENT AND AN URBAN AREA IN CHONGQING CITY

WU Li-ping1, ZHAO Da-wei2, ZHANG Dong-bao2，WANG Zhang-wei3, ZHANG Xiao-shan3   

  • Received:2005-06-20 Revised:2005-08-26 Online:2006-05-20
  • Contact: WU Li-ping

Abstract: This paper aimed to examine the condition of mercury pollution in Chongqing City. Mercury fluxes were calculated for throughfall, bulk deposition and runoff at two areas: a small forest catchment at Tieshanping(TSP) and an urban area Guanyinqiao(GYQ). The balance of input and output were calculated while the characters of mercury deposition in urban and rural area were analyzed. The results show that the Chongqing Area has endured mercury pollution to some extent, and GYQ endures more dry deposition with an important role at GYQ besides wet deposition, and wet deposition being much more crucial at TSP. In other words, the fine particle in atmosphere is the main source at TSP, and the coarse particles devote a lot at GYQ besides fine particle. So the emissions of local sources have more effects in urban area than in rural area in Chongqing City. Soil, especially the topsoil, is an important pool (reservoir) of mercury in the TSP catchment. Concentrations of mercury in the urban soil samples, particularly the samples near the fire plant, are higher than those in the rural soils, which shows the fire plant is an important mercury source.

Key words: mercury pollution, bulk deposition, throughfall, soil, runoff

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