郑州市城市土壤砷含量的分布特征及其成因探讨

Spatial Distribution and Its Cause of Arsenic (As) in Urban Soils of Zhengzhou

在对郑州市城市土壤采样分析的基础上，探讨了土壤中As的含量、分布、成因及其与人类活动的关系。结果表明，郑州市城市土壤表层土壤的平均As含量为7．67mg／kg，变幅为3．25～10．00mg／kg，未达到污染的水平；但城市土壤中As含量普遍高于郊区对照样，城市土壤高As值区位于老居民区、文教区和商业区。郑州市城市土壤As含量自表层向下没有一定的分布规律，且与土壤理化性质之间没有相关关系；其主要与人类活动强烈干扰有关，是典型的人为源重金属元素。城市土壤外源性As的输入主要是工业“三废”和市民日常生活中所丢弃的含As废物。

The content and spatial distribution of soil arsenic （As）, and the cause of formation and relation with human activities were studied based on the regional sampling in Zhengzhou urban soils. The results showed that As mean content in the topsoil was 7.67 mg/kg, ranging from 3.25 mg/kg to 10.00 mg/kg, lower than the pollution criterion of China, but commonly higher than the control soil. As content was high in old residential districts, cultural districts and shopping centers. As content distributed irregularly in soil profile, and no correlation with soil other physical and chemical properties, but mainly disturbed by human activities. In urban soils As mainly came from the industrial wastes and the daily living wastes scattered by the citizen.