新疆污灌区重金属含量及形态研究

Research on Concentration and Chemical Speciation of Heavy Metals in Sewage Irrigated Soil of Xin Jiang

本文对新疆污灌区土壤中Cu、Zn、N i、Cr、Pb五种重金属元素的含量和形态特征进行了研究。结果表明,Cu、Zn、N i、Cr、Pb主要富集在0—20cm表土中。以《土壤环境质量标准》GB15618—1995二级标准为评价标准,污染综合指数评价均为安全级。新疆污灌表土中Cu、Zn、N i、Cr、Pb以残渣态为主,水溶态和可交换态比例低,其中Cu、Zn、Pb的潜在生物可利用性较高。

This study was conducted to examine the concentration and chemical fraction of Cu, Zn, Ni, Cr and Pb in sewage irrigated soils in Xin Jiang. The results showed that the content of heavy metals in 0 -20 cm topsoil was much higher than that in middle layer and lower layer. Cu, Zn, Ni, Cr and Pb were evaluated according to the Standard of Soil Environment Quality （GB15618 -1995 ）. The comprehensive pollution index indicated the pollution was in safety category. Cu, Zn, Ni, Cr and Pb in sewage irrigated soil were dominated by the residual fraction, and were least present in soluble fraction and exchangeable fraction . The potential bioavailabilities of Cu, Zn and Pb were relatively high.