Distribution and potential ecological risk assessment of trace elements in the stream water and sediments from Lanmuchang area, southwest Guizhou, China
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Trace elements contamination in sediment is regarded as the global crisis with a large share in developing countries like China. Water and sediment samples were collected during (2016) from Qingshui Stream and analyzed for major physicochemical properties and trace elements by using ICP-MS. Our result of sediments showed that studied trace elements (except Pb, Cd, Co) had a concentration higher than Chinese sediment guideline as well as stream water data for studied trace elements (except Cr, Pb, Cd, Cu, and Zn) had a higher concentration than the maximum permissible safe limit of WHO. Contamination factor (CF) confirmed a moderate to high contamination in the sediment samples due to As and Tl, respectively. The values of pollution load index (PLI) were found above one (> 1), describing the progressive sediment quality decline. Pearson correlation showed that there was a significant positive association between Tl and As (r = 0.725, p < 0.05) in sediment samples. Results revealed that water-rock interaction, weathering of Tl sulfide mineralization, and hydrogeological conditions were major sources of stream water and sediments contamination in the study area. This experimental study contributes to a better understanding of the geochemistry and prevention of trace element contamination in sediments from Lanmuchang area.
KeywordsStream water Sediments Contamination Trace elements Pollution indices Southwest Guizhou
Constructive comments and helpful suggestions from the reviewers are acknowledged, which have helped improve this manuscript considerably.
This work was supported by the National Natural Science Foundation of China [grant number U1612442], [grant number 41473124], and [grant number 41673138]; the STS Net Plan of the Chinese Academy of Sciences [grant number KFJ-STS-ZDTP-005]; and the Public Welfare Foundation of the Ministry of Environmental Protection of China [grant number 201509051].
Compliance with ethical standards
Conflict of interest
The authors declare that there is no conflict of interest.
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