开封市污灌区土壤重金属污染评价

The assessment of heavy metal pollution in KaiFeng’s sewage irrigation region

通过分析污水灌溉在农业生产中的利弊及我国土壤的污染现状,运用内梅罗指数法及潜在生态危害指数法,分别参照国家土壤环境质量二级标准和土壤背景值对开封市污灌区土壤重金属污染状况进行了评价。结果表明,以二级标准为评价标准,评价结果为安全级别,以土壤背景值为评价标准,评价结果为轻度污染。但污灌区重金属含量明显超过清灌区重金属含量,Pb污染已达到中等污染水平,当地应采取有效措施以保护土壤免受污染。

Firsttly, The problems and soil pollution were analyzed in national sewge irrigaiton. Then, based on the national secondary standard for soil environmental quality and measured data, farmland heavy metal pollution in Kaifeng Irrigation area were evaluated by using Nemerow and potential ecological risk index method. It is proved by study findings that the soil quality are safe under the national secondary standard, but the soil quality was slightly polluted under the soil background value standard. Compared with fresh water irrigated area, farmland soil Pb pollution reached middle level. Therefore, It is necessary to take effective measures to prevent farmland pollution.