临安市底泥重金属污染特征及潜在生态危害评价

目的]了解浙江省临安地区底泥重金属的污染状况。方法]对临安地区底泥重金属污染水平与特征进行调查与分析,利用内梅罗综合指数法及潜在生态危害指数法,对该区域底泥重金属的污染程度与潜在的生态危害进行评价。结果]临安大部分地区底泥重金属污染等级属于尚清洁以上,个别地区受不同程度重金属污染;根据内梅罗综合指数法评价结果显示,临安地区底泥中重金属污染程度从大到小依次为Cd、Zn、Cu、Ni、Cr、Pb,清凉峰镇同山塘点位Cd严重超标,其次Zn污染程度也相对严重;太湖源镇、青山湖街道及板桥镇个别点位Ni、Cu、Zn重金属污染等级为轻污染;潜在生态危害指数法评价结果表明,清凉峰镇同山塘点位Cd潜在生态危害程度为很强,其他区域的潜在生态危害程度均为轻微。结论]该研究可为有效防治底泥重金属污染提供科学依据。

Investigation of Heavy Metal Pollution Characteristics and Potential Ecological Risk Assessment in Lin' an City

Objective] To understand the extend of pollution by heavy metal for sediment in linan area of Zhejiang province . Method] Inves-tigations and analysis is conducted to figure out the characteristics and the extend of pollution in the river sediment by heavy metal .On the ba-sis, nemerow index and potenial ecological risk index are employed for analysis of degree of contamination and ecological risk of Linan area sediment. Result] The monitoring results show that in most of the sediment of heavy metal belongs to the above is clean ,ndividual regions with different degree of heavy metal pollution.According to results the nemerow index, the degree of heavy metal pollution in sediment size from big to samll was Cd, Zn, Cu, Ni, Cr, Pb,the sampling points of tongshantang in qingliangfeng Cd exceeds bid badly, next Zn pollution was rela-tively serious; Another neighbourhoods of Taihuyuan, Qingshanhu, banqiao town individual points were less polluted.Potenial ecological risk index results showed that sampling points of tongshantang in qingliangfeng Cd potential ecological damage was very strong , other areas the po-tential ecological damage were slight. Conclusion] The study can provide scientific basis for effectively preventing and controlling heavy metal pollution in sediment.