电石渣堆放场重金属生态风险评价与成因分析

为了解电石渣堆放场重金属潜在生态风险和成因,选择天津市某电石渣堆放场为研究对象,通过现场采集电石渣样品和土壤样品,利用地累积指数和潜在生态风险评价方法对土壤重金属Cr,Ni,Cu,Zn,Cd,Pb,As,Hg含量进行分析.结果表明,场地内Zn,Cu,Cr平均值与天津市土壤背景值十分接近,地累积指数分布在-1.60～-0...

Ecological risk assessment and cause analysis of heavy metals in carbide slag dump

Ecological risk investigation of heavy metals was conducted at a storage site of calcium carbide slag in Tianjin, using statistical methods of ground accumulation index (GAI) and factor analysis. 31carbide slag and soil samples were collected throughout the site for indoor six typical heavy metals analysis (Cr, Ni, Cu, Zn, Cd, Pb, As and Hg). Results showed that GAI of the above metals at the site were between -1.60 and -0.10. The average values of Zn, Cu and Cr were very close to soil background value of Tianjin with GAI below 0, which indicated there was no pollution of Zn, Cu and Cr. Dot mild pollution of Ni, Pb and As existed at this site due to their GAI less than 1. Cd was detected as "Moderate contaminant" as the maximum GAI of Cd was 1.20. The most protruding problem was the pollution of Hg which GAI was up to 4.20. Through the method of factor analysis, it was found that factor 1represented the content of components depended on soil parent materials including Cr, Ni, Cu, Zn, Pb and As. Cd and Hg were supposed to be high potential ecological risk factors mainly affected by leaching of carbide slag and chemical inhibition functions of varied heavy metals in the soil.