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引用本文:徐友宁 张江华 柯海玲 刘瑞萍 陈华清. 某金矿区农田土壤镉污染及其环境效应[J]. 中国地质, 2013, 40(2): 636-643.
XU You-ning, ZHANG Jiang-hua, KE Hai-ling, LIU Run-ping, CHEN Huan-qing. Cd contamination of farmland soil in a gold mining area and its environmental effects[J]. Geology in China, 2013, 40(2): 636-643(in Chinese with English abstract).
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某金矿区农田土壤镉污染及其环境效应
徐友宁 张江华 柯海玲 刘瑞萍 陈华清
中国地质调查局西安地质调查中心,陕西 西安 710054
摘要:
提要:镉是环境中危险的毒重元素,金属矿区往往存在较严重的镉污染。为了查明小秦岭金矿区金矿开发活动对农田土壤镉的累积影响,以及农作物和人体健康的效应程度,较为系统地采集了农田土壤、小麦玉米、主要蔬菜和人发样品,采用国家标准和邻区对照值的方法,结果表明金矿区选矿尾矿渣是矿区水土环境镉污染的主要来源。土壤镉含量超过了国家土壤环境质量二级标准倍数的范围为0~44.6,样本超标率6.77%,土壤镉含量超标的面积21.8 km2,占金矿区土壤面积的7.8%;高于对照区土壤镉含量的土壤面积约138 km2,占研究区总面积的49.46%。金矿区30.7%的小麦籽粒样本中镉含量超过国家倍数1.2~3.2,小麦中镉的富集程度明显高于对照区。叶菜中,镉超标率77.7%。萝卜叶、西红柿、萝卜中镉含量均高出对照区。农作物中镉含量与土壤中镉含量呈现较好的正相关关系。大气、土壤及地下水交叉污染的较严重的某村住,不同年龄及性别人群人群发镉均值是对照区的1.91~6.09倍,2009年发镉含量是2005年的4.35倍,人群健康受到了严重威胁。
关键词:  农田土壤  农作物  头发  镉污染  金矿区
DOI:
分类号:
基金项目:国土资源大调查项目“小秦岭金矿带矿山环境地质问题专题调查”(1212010741003)、国土资源部行业科研专项经费“矿集区环境地球化学累积效应及风险预警”(20111020)、国土资源部黄土地质灾害防治重点实验室及陕西潼关金矿区矿山地质环境野外科学观测基地等联合资助。
Cd contamination of farmland soil in a gold mining area and its environmental effects
XU You-ning, ZHANG Jiang-hua, KE Hai-ling, LIU Run-ping, CHEN Huan-qing
Xi’an Center of Geological Survey, CGS, Xi’an 710054, Shaanxi, China
Abstract:
Abstract:Cadmium is a dangerous element that pollutes the environment. The metal mining area is usually an area of serious Cd contamination. In order to study the pollution degree of farmland soil and the pollution effect on crops and human hair in the Xiaoqinling gold mining area, the authors carried out field investigation. An analysis of a series of samples of soil, corps and human hair shows that tailing is the main source of Cd contamination in water-soil environment. The standard-surpassing multiple of Cd in soil ranges from 0 to 44.6,with a standard-surpassing rate of 6.77% relative to the state standard. The farmland with high Cd content covers an area of 21.8km? and possesses 7.8% of the study area. The standard-surpassing multiple in 30.7% wheat samples ranges from 1.2 to 3.2. The Cd content in the study area is obviously higher than that in the contrast area, where the wheat is safe to eat. The standard-surpassing rate of Cd content in vegetables is 77.7%. The Cd in radish and tomato in the study area is higher than that in the contrast area. There is a significant positive relation between Cd content in soil and that in crops. In the area polluted by air, soil and groundwater, the Cd content of human hair is 1.91-6.09 times that of the contrast area. The Cd content of human hair in 2009 was 4.35 times that in 2005. All this has constituted a serious threats to human health.
Key words:  farmland soil  crop  hair  Cd contamination  gold mining area