近年来,我国由重金属引起的土壤污染重大事故频发,如“镉大米”、“癌症村”、“宋家庄地铁站中毒”等。土壤污染的危害极大,会导致农作物减产以及农产品品质降低,污染地表水和地下水,危害人体健康。据调查,全国土壤点位超标率为16.1%,耕地的土壤点位超标率已达到19.4%。 In recent years, China has caused serious accidents of soil pollution caused by heavy metals, such as “Cadmium Rice”, “Cancer Village”, “Songji Zhuang Subway Station Poisoning” and so on. Soil pollution is extremely harmful, which will lead to the decrease of crops and the deterioration of the quality of agricultural products, polluting surface water and groundwater and endangering human health. According to the survey, the exceeding rate of soil point in the country is 16.1%, and the exceeding point rate of soil point in cultivated land has reached 19.4%.