中国岩溶2016，Vol.35Issue(2)：144-152,9.DOI:10.11932/karst20160203
重庆南山老龙洞地下河表层沉积物重金属环境地球化学特征及生态风险评价
Environmental geochemistry characteristics of heavy metals and ecological risk assessment of surface sediments from Nanshan Laolongdong subterranean river,Chongqing
摘要
Abstract
The surface sediment was collected from a karst subterranean river in Nanshan,Chongqing,in December 2013.These samples were analyzed by using Inductively Coupled Plasma Mass Spectrometry(ICP-MS)and Inductively Coupled Plasma Optical Emission Spectrometry(ICP-OES),respectively,to determine the content of heavy metals(Mn,Pb,Cu,As and Cr)in the sediments.Meanwhile,the geo-accumulation pollution index and potential ecological risk index were used to assess the ecological risk of heavy metals in sediments,so as to provide a scientific basis for the development of urban construction and protection of karst groundwater.Results showed that Mn,Pb,Cu,As and Cr are enriched in Laolongdong subterranean river sediments,with the enrichment of these heavy metals as Cr>Cu>Mn>Pb>As.It was TOC (total organic carbon)that controlled the sediments heavy metal contents,but not pH and particle size of sedi-ments.Meanwhile,TOC also controlled SAC (stability assessment code),which has an effect on the migra-tion of the heavy metals,and influences the quality of overlying water.In general,heavy metals in surface sediments from Laolongdong were in slightly-polluted state evaluated by geo-accumulation pollution index, and implied a low probability of toxic effect evaluated by potential ecological risk index.关键词
重金属/表层沉积物/环境地球化学特征/岩溶地下河/重庆南山Key words
heavy metals/surface sediments/environmental geochemistry characteristics/karst subterrane-an river/Nanshan in Chongqing分类
资源环境引用本文复制引用
任坤,陈志兵,潘晓东,张媚..重庆南山老龙洞地下河表层沉积物重金属环境地球化学特征及生态风险评价[J].中国岩溶,2016,35(2):144-152,9.基金项目
中国地质科学院基本科研业务费专项经费(2016005) （2016005）
中央高校基本业务费专项资金资助(XDJK2015D003) （XDJK2015D003）
重庆市基础与前沿研究计划院士专项项目(CSTC2013JCYJYS20001) （CSTC2013JCYJYS20001）
国家自然科学基金项目(41103068) （41103068）
乌蒙山连片贫困缺水区1∶5万水文地质调查(121201107000150048) （121201107000150048）
西南典型岩溶流域水文地质环境地质调查(1212011220950) （1212011220950）
