Abstract:

Samples of soil and air around a coal-fired power plant were collected and the concentrations of Hg were determined through the amalgamation/CVAAS method.Spatial distributions of Hg in soil and air around the power plant were investigated by using geostatistics techniques.The results showed that mercury concentration in air samples varied from 4.3 ng·m^-3 to 12.4 ng·m^-3 with an average of 7.0 ng·m^-3，and Hg levels in soil samples were in the range of 0.045—0.529 mg·kg^-1 with an average of 0.180 mg·kg^-1.After twenty-three years of operation，the power plant has caused an increase of mercury levels in the surrounding environment.Except the annular region of radius between 1 km and 3 km contaminated by the power plant maximally，mercury pollution decreased as the distance from the power plant increased.

Key words:

汞, 燃煤电厂, 环境, 地统计学

摘要：

结合当地气象条件，采集了某燃煤电厂周边地区的土壤和大气样品，采用美国EPA认可的热分解方法，经双光束冷原子吸收法测定其汞含量，应用地统计学方法分析了电厂周边表层土壤汞含量的空间分布特性。结果表明，该燃煤电厂周边地表空气中汞的浓度范围为4.3～12.4 ng·m^-3，平均值7.0 ng·m^-3，表层土壤中汞的含量范围为0.045～0.529 mg·kg^-1，平均值0.180 mg·kg^-1，虽均未超过国家允许的标准，但与当地背景值相比，周边地区的大气汞浓度和土壤汞含量都有一定程度的增加。电厂是该地区主要的汞污染源，除距烟囱1～3km的环形区域受影响较大外，污染程度随着与电厂距离的增大而递减。

关键词:

汞, 燃煤电厂, 环境, 地统计学