南宁市郊菜园土壤重金属污染评价

Evaluation on Pollution of Heavy Metals in Vegetable Garden Soils in Suburbs of Nanning City

通过采集土样进行分析,对南宁市郊菜园土壤重金属Cu、Zn、Pb、Cd污染状况进行了调查及评价。结果表明:菜园土壤Cu、Zn、Pb、Cd的平均值均高于南宁市土壤背景值。菜园土壤主要受Zn、Cd污染,其中以Cd污染较为突出,超标样点占全部样点的38.6%,Zn污染超标占10.5%;污染呈近郊大于远郊的趋势。

The contents of Cu,Zn,Pb,Cd in vegetable garden soils in suburbs of Nanning City were analyzed in our laboratory in order to evaluate pollution of heavy metals on farmland through a survey.It was discovered that the average contents of the heavy metals were generally higher than background values in soil of Nanning City.This is mainly due to the fact that the vegetable garden soils have been polluted by Zn and Cd.It was also found that Cd pollution was critical,and seriously by indicating that: the rates of exceeding controlling standard promulgated by government for Cd and Zn were 38.6% and 10.5%,respectively.The pollution tendency of the heavy metals in the studied soils was in the following orders: near suburbs>distant suburbs.