地块重金属测定及生态环境风险评价研究

Determination of Heavy Metals and Ecological Risk Assessment

对某地块土壤样品进行采集、测试,利用单项污染指数法、内梅罗综合污染指数法、潜在生态危害指数对测定结果进行评价。铜、铅、锌、镉、汞、砷的浓度分别为21.7 mg/kg、27.8 mg/kg、66.9 mg/kg、0.125 mg/kg、0.070 mg/kg、17.7 mg/kg,达到《土壤环境质量标准》(GB 15618-1995)中的表1二级标准。单因子污染指数法计算结果显示监测地块土壤未受到污染;内梅罗综合污染指数均小于0.7,污染等级为安全、污染水平为清洁;监测的6种重金属的潜在生态危害系数均小于4,潜在生态危害指数计算结果小于150,表明有一定的轻微生态危害。

The soil samples of a land plot were collected and tested. The single pollution index method,the Nemero comprehensive pollution index method and the potential ecological risk index were used to evaluate the results. The concentrations of copper,lead,zinc,cadmium,mercury and arsenic were 21. 7 mg/kg,27. 8 mg/kg,66. 9 mg/kg,0. 125 mg/kg,0. 070 mg/kg and17. 7 mg/kg,reaching Standard II which is prescribed in ＂Soil Environmental Quality Standards＂（ GB 15618-1995）. The results of single factor pollution index method showed that the soil in the monitoring plots was not polluted. he Nemerow comprehensive pollution index was less than 0. 7,the pollution level was safe and the pollution level was clean. The potential ecological risk factors of the six kinds of heavy metals monitored were less than 4. The calculation of the potential ecological risk index is less than 150,indicating a slight ecological risk.