Investigation on the Vegetable Farm Soils Polluted by Zinc,Copper and Lead in Suburb of Hangzhou

Objective]To study the pollution of heavy metals in vegetable farm soils [Methods]The levels of zinc,copper and lead in 60 soil samples obtained from vegetable farm in suburb of Hangzhou were detected [Results]The levels of total zinc,total copper and total lead were 97 5~286 8 mg/kg,7 3~205 5 mg/kg and 38 8~98 4 mg/kg in fluvio marine yellow loamy soils;75 7~302 0 mg/kg,4 3~143 5 mg/kg,and 13 9~87 8 mg/kg in fluvio marine polder soils;89 5~150 3 mg/kg,15 5~43 0 mg/kg and 27 8~58 1 mg/kg in aquic silt loamy soils The maximum levels of observed three elements all exceeded the polluted standards,which were 1 5 times of the natural background values of soil 65% of total soil samples presented complex pollution of above 3 elements,the levels of which showed significant correlation between each others [Conclusion]It was essential to control the complex pollution sources,such as city rubbish and sludge The higher cofficients of variation for the levels of zinc,copper and lead in three kinds of soil predicted the existences of some point polluted sources