某城市不同功能区土壤中镉含量的分析与污染评价

Soil Cadmium Content Analysis and Contamination Evaluation of A City Different Functional Areas

采用潜在生态危害指数法评价乌鲁木齐市不同功能区土壤的镉污染状况。采集23个土壤样品,采用王水-HF-HC lO4体系消解,用火焰原子吸收分光光度法分析测定土壤中的镉含量。结果表明,不同功能区土壤中镉的含量为生活区>行政区>文教区,最大值为7.65mg/kg,最小值为0.35mg/kg,平均值为2.36mg/kg。乌鲁木齐市不同功能区土壤中的镉污染比较严重:文教区的Eir平均达89.1,生态危害较高,行政区的Eir为147.3,生态危害高,生活区的E ir为205.6,生态危害极高。

The cadmium contamination situation of different functional districts in Urumqi is evaluated by Hakanson＇ s potential ecological risk index. 23 soil samples are collected, and digested by aqua regia-HF-HClO4 system, and determined by FAAS. The results show that the concentration of Cd in living areas 〉 administrative areas 〉 cultural and educational areas, the maximum is 7.65mg/kg, the minimum is 0. 35mg/kg, and the average is 2.36mg/kg. It is expressed by evaluation results that Urumqi has been suffering from serious contamination of Cd in soil currently： the average of Eir in cultural and educational areas is 89. 1, indicating higher ecological risk; while in administrative areas Eir is 147.3, implying high ecological risk; and the ecological risk in living area is the highest, the Eir reaches 205.6.