一、土壤污染源土壤污染物计有重金属和有机污染物、农药和病原菌,按其来源可分三类.1.工业污染由工业三废引起的土壤污染一般限于工业区周围数公里、数十公里范围内.例如某冶炼厂炼铝车间每天由烟囱向空中放出铝尘3～6吨,镉尘70～170公斤,烟尘影响范围,大致在1,500米左右.在影响区域内,土壤中 First, the soil pollution sources Soil pollutants, including heavy metals and organic pollutants, pesticides and pathogens, according to their sources can be divided into three categories.1.Industrial pollution Industrial pollution caused by soil pollution is generally limited to several kilometers around the industrial area, tens of kilometers range For example, a smelter aluminum smelting plant to the air from the chimney to the release of 3 to 6 tons of aluminum per day, cadmium and dust 70 to 170 kg, the scope of the impact of dust, roughly 1,500 meters in the affected area, the soil