贵州东部某燃煤电厂汞排放对周边环境空气及土壤的影响

结合当地气象条件,测定贵州省东部某燃煤电厂下风向环境空气汞浓度分布情况,同时测定该燃煤电厂周边表层土壤中汞含量,并对其污染程度进行评价,探讨了土壤汞与理化性质间的相关性。结果表明,该燃煤电厂下风向环境空气汞浓度远高于北半球大气气态总汞背景值,空气汞浓度在2.7 km范围内随距离的增大而增大,在2.7~5.0 km范围内汞浓度随距离的增大而减小。电厂周边表层土壤汞含量是贵州省A层土壤Hg背景值的8.5倍,存在中度到重度程度的污染,土壤Hg与土壤pH呈正相关性,但与土壤有机质未表现出相关性。

Mercury Influence of a Coal-Fired Power Plant in East Guizhou on the Ambient Air and Soil

This paper measures the mercury concentration distribution of ambient air in the downwind and the mercury content in the surrounding surface soil of a coal-fired power plant in east Guizhou according to the local meteorological conditions, evaluates the pollution degree and discusses the correlation between soil mercury and physicochemical property. The result shows that the mercury concentration of ambient air in the downwind of the coal-fired power plant is much higher than the total gaseous mercury background value of air in the Northern Hemisphere, and the mercury concentration of air is increased within 2.7 km and reduced within 2.7-5.0 km with the increasing of distance. The mercury content of the surface soil around the power plant is 8.5 times of the Hg background value of soil layer A in Guizhou and has moderate/serious pollution, and the soil Hg is positively correlated with the soil pH but has no correlation with the soil organic matter.