城市功能区土壤汞赋存形态分析及潜在污染初步评价——以桂林市为例

Analysis of occurrence and potential pollution assessment of mercury in soil of urban functional areas:a case for Guilin City

用DMA-80测汞仪测定城市(以桂林市为例)公园区、公路旁、工业区、河流沿岸、农田区的土壤总汞及各赋存形态汞的含量,并对各功能区土壤汞的赋存形态进行分析。结果发现,各功能区土壤汞的分布存在明显差异,主要以高温热态汞和硫化物相态汞的形态为主,占到了总汞含量的一半以上,吸附热态汞、低温热态亚汞、低温热态汞及中温热态汞含量较为平均,含量在8%~13%之间。工业区土壤总汞的含量高于广西土壤汞的最高背景值,存在一定的污染风险,整个测区土壤汞的平均值符合国家土壤环境质量标准的二级标准。

Total mercury content and mercury content in form of soil in parks,highways,industrial areas,rivers coastal and farmland areas in city(case for Guilin)were measured by DMA-80 Mercury Analyzer,and the occurrence of soil mercury in various functional areas was analyzed.The results show that there were some differences in the distribution of mercury in different functional areas,mainly in the form of high temperature release mercury and sulfide phase mercury,which accounted for more than half of the total mercury content.The contents of mercury in adsorbed heat release state,low-temperature heat release sub-mercury state,low temperature heat release state and medium temperature heat release state are more average and change in 8%to 13%respectively.The total mercury content is also distinct,and that in the industrial area is higher than the highest background value of the Guangxi soil mercury,and there is a certain risk of pollution.Although the total amount of mercury in the industrial area is high,the average value of the soil mercury in the whole survey area is in accordance with the secondary grade standard of the national soil environmental quality standard.