兰州市表层土壤中汞的生态地球化学评价  

THE EVALUATION OF Hg ECOLOGICAL GEOCHEMISTRY OF SURFACE SOIL IN LANZHOU

作　　者：刘文辉[1] 李春亮[1] 吴永强[1] 王习礼[1] 

机构地区：[1]甘肃省地质调查院,甘肃兰州730000

出　　处：《物探与化探》2012年第5期869-873,共5页Geophysical and Geochemical Exploration

摘　　要：对兰州市1 663 km2范围内的表层土壤和大气干湿沉降空间分布模式进行了分析,认为表层土壤中Hg的含量差异较大,其中Hg的平均含量为0.14×10-6,最高值为6.38×10-6。对土壤中Hg的存在形式进行了研究,认为燃煤是其主要来源。大气总汞浓度年平均值为28.62×10-9,其中采暖期为48.48×10-9,非采暖期为9.42×10-9。根据国家土壤环境质量标准,兰州市Hg环境质量达到Ⅰ级标准的土壤面积为1 376.1 km2,占研究区总面积的82.75%;Ⅱ级土壤面积246.8 km2,占14.84%;Ⅲ级土壤面积31.7 km2,占1.91%;Ⅳ级土壤面积8.4 km2,占0.51%。Ⅲ、Ⅳ级区域主要分布在兰州市西固区石化厂及其附近、七里河区西关十子—城关区二热电厂。Based on analyzing the spatial distribution patterns of surface soil and atmospheric （ dry and wet） deposition of Lanzhou cov- ering 1 663 km2, the authors concluded that the average content of Hg in surface soil is 0.14 × 10^ -6 with the peak value being 6.38× 10^-6, and that burning coal is the main source of Hg in surface soil. The annual mean value of total Hg content in air of Lanzhou is 28.62× 10^ -9 ,whereas the value during the heating period and non-heating period is 48.48 × 10^ -9 and 9.42 × 10^-9 ,respectively. Ac- cording to the National Environmental Quality Standards for Soil , the area of Grade I Hg quality in surface soil of Lanzhou reaches 1 376.1 km2, while Grade Ⅱ , Ⅲ, Ⅳ possesses 246.8 km2, 31.7 km2 and 8.4 km2 respectively. The area of Grade Ⅰ accounts for 82.75% of the whole study area, while the percentage for Grade Ⅱ , Ⅲ, Ⅳ is 14.84% ,1.91% and 0.51%, respectively. It is found that the areas of Grade Ⅲ and Ⅳ are mainly distributed around the Petrochemical Plant of Xigu District and Lanzhou Second Heat and Power Factory in Chengguan and Qilihe districts.

关 键 词：汞污染 地球化学特征 生态评价 兰州市 

分 类 号：P632[天文地球—地质矿产勘探]