Environmental geochemistry characteristics of heavy metals and ecological risk assessment of surface sediments from Nanshan Laolongdong subterranean river,Chongqing
REN Kun
CHEN Zhi-bing
PAN Xiao-dong
ZHANG Mei
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.
Keywords：heavy metalssurface sedimentsenvironmental geochemistry characteristicskarst subterrane-an riverNanshan in Chongqing
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 144-152 )