成都市近郊蔬菜基地土壤重金属污染现状评价--以2个蔬菜基地为例

摘要

Taking two vegetable bases as the sampling places which located in Chengdu suburban area---Jiangjia vegetable field in Jinjiang District and Yongning Town in Wenjiang District ,this research collected sampling soil of 0~20 cm at eight sampling points.After measurements of the soil on the pH value and content of the six heavy metals(cadmium,lead,copper,zinc,nickel and chrome),the thesis analyzed the condition of heavy medal pollution in the soil by adopting both the single factor index method and nemerow multi-factor index method.The results were as following ,the pH value of the soil at the two sampling places at the suburban area ranged from 5.53 to 7.03 ,which indicated generally acidity. The single factor indexes were all 1.62,which indicated that the soil was just slightly polluted by nickel and there was no other heavy medal pollution. Besides ,the nemerow indexes in the two places were 1.24 and 1.25 ,respectively.Both places had slight heavy medals pollution ,among which nickel was the major pollution element.%以成都市近郊的锦江区江家菜地和温江永宁镇2个蔬菜基地作为采样地，共采集了8个采样点的0~20 cm土样，测定土壤中的6种重金属（镉、铅、铜、锌、镍、铬）的含量和pH值，再利用单项污染指数和综合污染指数评价方法，对土壤重金属的污染状况进行分析。结果表明：成都市近郊的2个蔬菜基地的土壤pH 值范围为5.53~7.03，总体呈酸性；单项污染指数表明土壤受到了镍元素的轻度污染，其单项污染指数均为1.62，并未受到其他重金属的污染；综合污染指数分别为1.24、1.25，属于轻度的重金属污染，最主要的污染元素为镍元素。