恩施菜地土壤重金属污染的生态风险评价和来源分析  

Ecological risk assessment and source analysis on heavy metals of vegetable fields of Enshi

作　　者：黄金[1] 廖照江[1] 杨磊[1] 

机构地区：[1]三峡大学化学与生命科学学院,湖北宜昌443002

出　　处：《广东农业科学》2013年第3期142-146,共5页Guangdong Agricultural Sciences

基　　金：国家自然科学基金(20977058)

摘　　要：采集恩施4片不同区域菜地108份土样,用电感耦合等离子体质谱仪检测样品中的Cu、Zn、Ni、Cr、Pb、Cd、As、Mn、Co、Ba、V、Tl、Bi、Hg等14种重金属含量,利用单因子指数法、多因子综合评价法以及Hakanson生态风险指数法评价所调查菜地的重金属综合污染效应和生态风险。结果表明,所调查区域菜地土壤污染是以重金属Cd、Mn和Cu为主的复合污染,其中有2片菜地处于较强的生态风险等级。对14种元素进行了相关性研究和来源性分析,结果表明,Mn、As和Co来源于土壤母质本身,其余重金属污染主要原因是矿产资源开发和资源产品的使用。In this research, we collected 108 soil samples from four different vegetable fields in Enshi City. The contents of fourteen heavy metal elements including Cu, Zn, Ni, Cr, Pb, Cd, As, Mn, Co, Ba, V, T1, Bi and Hg were detected by inductively coupled plasma mass spectrometry （ICP-MS）. The compositive pollution effects and ecological risk in the four vegetable fields of the heavy metals were evaluated through the single factor index method, the Nemero synthesis index evaluation method and the Hakanson ecological risk index method. The results showed that the pollution of the vegetable fields in the survey region were attributed to a multi-metals pollution by the Cd, Mn and Cu. The vegetable fields in Enshi City have been polluted by heavy metals based on the results of the analysis of the single factor index method and the Nemero synthesis index evaluation method. The Hakanson ecological risk index method pointed out that Enshi City was in considerable level potential ecological risk. The pertinence and source of 14 mental elements have been researched and analysed. There were different sources to 14 metal elements in soils, Mn, Co and As were predominantly derived from parent materials, and others were affected by the exploitation of the minerals and the employment of resource product.

关 键 词：恩施菜地 重金属污染 生态风险 来源分析 

分 类 号：X825[环境科学与工程—环境工程]