陕北泥炭中重金属元素丰度及其潜在生态危害

Abundance and potential ecological risk of heavy metals in peat of northern Shaanxi

摘要: 采用原子吸收分光光度计法对陕北榆林地区的孟家湾、河湾、尔林兔3个地区泥炭中的重金属元素进行了分析,并根据Hakanson提出的潜在生态危害指数法对其潜在生态危害性进行了评价。结果表明:Cd元素的含量超过土壤背景值,Cu、Pb、Cr、Mn 4个元素的含量均低于土壤背景值;重金属元素的生态危害指数除Cd较高,属极高水平外,Cu、Pb、Cr、Mn均较低。这3个地区泥炭中的重金属元素生态危害程度为中等以上,且尔林兔>河湾>孟家湾。

Abstract: Adopting adsorption spectrophotometry the heavy metals in peat of Mengjiawan, Hewan and Erlintu in northern Shaanxi were analyzed. Based on these data,the potential ecological risk of heavy metals was assessed by using the method of potential ecological risk index presented by Hakanson. The resalts show that the content of Cd has exceeded national environmental standard. The potential ecological risk index of Cd is very high,while those of Mn,Cu,Cr,Pb are lower than standards. Of three areas,the potential ecological risk of heavy metals of Erlintu is high, Hewan and Mengjiawan are in middle level,having a rule of Erlintu 〉 Hewan 〉 Mengjiawan.