六种典型农业区域土壤污染现状监测评估

在对6种典型农业区域土壤污染状况进行调查监测的基础上,结合土壤环境质量标准,评估所监测地区土壤污染现状及其趋势。结果表明,污水灌溉区和常规农业生产区的重金属综合污染指数明显高于其他典型区域,揭示了污水灌溉和农药、化肥的施用是土壤中重金属污染的主要来源。以六六六和滴滴涕为主的有机氯农药浓度总体已远低于标准限值,污染水平总体上处于安全状态,但仍存在局部污染。持久性致癌有机物多环芳烃类在6种典型区域检出率为100%,表明土壤污染在向有机-无机复合污染的方向发展。

Survey and Evaluation of Pollutants in 6 Typically Agricultural Soils

Situation and trends of polluted soils from six typical agriculture fields have been outlined with the environmental quality standards of soil promulgated.The results showed that the entire pollution indexes of heavy metals in the field that had been irrigated with sewage and conventional farmlands were obviously higher than that of other fields.The pollutants of heavy metals in the soils were originally mainly from sewage irrigation,and application of pesticides and chemical fertilizers.In addition,the concentrations of organo-chlorine pesticides such as hexachlorocyclohexane(BHC) and dichlorodiphenyl trichloroethane(DDT) were remarkably lower than the standard values,indicating that this pollution is negligible.Additionally,it has been found that positive samples containing resistant cancerogens,polyaromatic hydrocarbons(PAHs) were 100 percent in the six typical fields surveyed.That showed the trends of soil pollution was characterized by a combined organic and inorganic pollutants.