摘要
在宝鸡市蔬菜地土壤重金属污染调查的基础上 ,采用单因子指数法、内梅罗综合污染指数法 ,对土壤重金属污染状况进行了评价。以国家《土壤重金属污染评价标准》(GB1 5 61 8- 1 995 )为标准 ,则蔬菜地土壤重金属未超过二级标准 ,个别样点As、Cd污染较重 ,各元素污染顺序为As>Cd >Zn >Pb >Cu >Cr。以《绿色食品产地环境质量评价纲要》中土壤污染分级为标准 ,Cd的污染等级为中污染级 ;As、Zn为污染级 ;Cu为警戒级 ;Cr、Pb为安全级。各元素污染顺序为Cd >As>Zn >Cu >Cr >Pb。调查分析发现 :污水灌溉是重金属污染的主要原因。土壤重金属污染防治 ,应坚持预防为主 ,综合防治的原则。运用工程措施和非工程措施相结合的方法 ,治理污染。
Based on investigation of soil heavy metal in 14 vegetable fields in Baoji,the degree of heavy metal pollution in soils are evaluated with different evaluation methods and evaluation standards.Using National Standard(GB15618-1995)as evaluation standard,the results showed that the fields were not polluted by As、Cd、Zn、Pb、Cu、Cr,As、Cd were found in some areas.The degree of pollution showed order as As>Cd>Zn>Pb>Cu>Cr.Using the criterion of heavy metal- contaminated soil degree in the《environmental quality evaluation schemataof green food habitat》as evaluation standard,the degree of pollution showed order as Cd>As>Zn>Cu>Cr>Pb,Cd was mid pollution,As、Zn were pollution,Cu was alert level.The causes of Heavy metals pollutionare irrigation of sewage etc.The principle of prevention is “precaution is first,and combined with harness ”.Pollution can be harnessed with engineering measures and non-engineering measures.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2005年第2期101-104,共4页
Journal of Arid Land Resources and Environment
基金
陕西省教育厅科研基金项目 (0 1JK111)
