江苏南通表土、地面灰重金属污染及潜在生态风险评价

选取南通市不同功能区表土、地面灰为对象,测试重金属元素Pb、Zn、Cu、Ni、Cr含量,并评价重金属污染水平和潜在生态风险程度.结果表明,表土、地面灰中Pb、Zn、Cu含量较高,污染较为严重,Ni、Cr含量较低,污染较轻.重金属污染顺序为工业区〉商业区〉交通区〉文教区〉住宅区.表土与地面灰重金属物质来源相似,一部分主要来自地壳物质,一部分受人为污染干扰.地面灰的重金属污染水平及潜在风险程度均高于表土,且崇川区工业区、商业区潜在生态风险程度较高,其余地区潜在生态风险程度较低.该项研究可为重金属污染防治提供科学参考.

Pollution and ecological risk assessment of heavy metals in the top soils and dusts of Nantong City,Jiangsu

In this study,the contents of heavy metals Pb,Zn,Cu,Ni and Cr in samples of the top soils and dusts from different functional zones of Nantong City were measured,and the level of heavy metal pollution and potential ecological risk were assessed.The results show that the contents and pollution level of Pb,Zn,Cu elements in the top soils and dusts were higher than those of Ni,Cr.The descending order of heavy metal pollution levels is industral zone,commercial zone,traffic zone,cultural and educational zone,residential zone.The sources of heavy metals in the top soils and dusts are similar,part of them come from crust materials,part of them from human activities.The heavy metal pollution and potential ecological risk of the dusts are more serious than those of the top soils.The potential ecological risk levels of industrial zone and commercial zone in Chongchuan District are relatively higher than other areas studied in this article.This research can provide scientific data for the prevention of heavy metal pollutions.