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Geochemical distribution, fractionation, and sources of heavy metals in dammed-river sediments: the Longjiang River, Southern China
Xiaolong Lan;  Zengping Ning;  Yizhang Liu;  Qingxiang Xiao;  Haiyan Chen;  Enzong Xiao;  Tangfu Xiao
2019
发表期刊Acta Geochimica
卷号38期号:2页码:190-201
摘要

In the present study, six sediment cores were collected from six river-dammed reservoirs to reveal the geochemical distribution of heavy metals (As, Cd, Pb, Sb, and Zn) in the Longjiang River, South China, which is highly impacted by nonferrous metal mining and smelting activities. The sediments were geochemically characterized, combining geochemical analysis, sequential extractions, and 210Pb chronology. The results indicated that the river sediments were severely polluted by heavy metals in the order of Cd > Zn ≈ Pb ≈ Sb > As. These heavy metals generally exhibited relatively low enrichment in the upstream sediments because of the limited anthropogenic impact, but their abundances drastically increased in the midstream sediments due to local smelting activities. In downstream sediments, the heavy metal concentrations (except for Cd) decreased, owing to the effect of dam interception and detrital inputs. Cadmium levels tended to increase in downstream sediments, which were attributed to the intensive discharge of Cd during the pollution event in 2012. The sedimentary records were traced back to 1985, and a significant decrease of heavy metal enrichments could be found after the year 2000, suggesting the enhancement of environmental management in this period. The statistical results indicated that local metal smelting and mining activities were the main anthropogenic contributors for the enrichment of heavy metals in the dammed-river sediments. High enrichment factor and non-residual fractions of heavy metals in local sediments may pose a direct threat to aquatic organisms. Cd presents significant danger because of its extreme enrichment and high labile fractions.

关键词Heavy Metals fractionation 210pb Dating smelting And Mining Activities sediment Cores the Longjiang River
收录类别EI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/10234
专题环境地球化学国家重点实验室
作者单位1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
推荐引用方式
GB/T 7714
Xiaolong Lan;Zengping Ning;Yizhang Liu;Qingxiang Xiao;Haiyan Chen;Enzong Xiao;Tangfu Xiao. Geochemical distribution, fractionation, and sources of heavy metals in dammed-river sediments: the Longjiang River, Southern China[J]. Acta Geochimica,2019,38(2):190-201.
APA Xiaolong Lan;Zengping Ning;Yizhang Liu;Qingxiang Xiao;Haiyan Chen;Enzong Xiao;Tangfu Xiao.(2019).Geochemical distribution, fractionation, and sources of heavy metals in dammed-river sediments: the Longjiang River, Southern China.Acta Geochimica,38(2),190-201.
MLA Xiaolong Lan;Zengping Ning;Yizhang Liu;Qingxiang Xiao;Haiyan Chen;Enzong Xiao;Tangfu Xiao."Geochemical distribution, fractionation, and sources of heavy metals in dammed-river sediments: the Longjiang River, Southern China".Acta Geochimica 38.2(2019):190-201.
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