He, Xiaoqing1,2; Chen, Guojun1; Fang, Ziyao1,2; Liang, Wenjian1; Li, Boda1; Qin, Liping1,2; Chen, Guojun3,4; Li, Boda5; Tang, Jianhui6
; Sun, Yongge7发表期刊ENVIRONMENTAL POLLUTION
ISSN0269-7491
2020-09
卷号264页码:114686
关键词Chromium contaminationChromium isotopesRiver sedimentsThe Xiaoqing RiverLeaching experiments
DOI10.1016/j.envpol.2020.114686
英文摘要Hexavalent chromium, Cr(VI), is a heavy metal contaminant and the reduction of Cr(VI) is accompanied by large isotopic fractionation. In this study, the sources of Cr were explored using the Cr isotopic composition of sediments from the Xiaoqing River, a heavily polluted river located in the Shandong Province of China, which flows into Laizhou Bay. The results show that delta Cr-53 values of the sediments are the highest upstream near the pollution source, and gradually decrease along the river toward the range for igneous reservoirs observed near the estuary. Based on the calculation of authigenic Cr isotopic composition (delta Cr-53(auth)) using the detrital index and leaching experiments, we suggest that the authigenic Cr in the sample near the pollution source with the highest delta Cr-53(auth) value mainly comes from the reduction of Cr(VI) discharged by anthropogenic activity, and authigenic Cr in other samples in the midstream with delta Cr-53(auth) values slightly higher than the range of igneous reservoirs may come from natural oxidative Cr weathering products. By introducing a Rayleigh model, we calculate that at least 31% -55% of Cr(VI) in the river water had been reduced to Cr(III) near the pollution source. Due to the self-purification ability of the river, Cr(VI) was reduced; thus, there is no record of high delta Cr-53(auth) values in the downstream of the Xiaoqing River and Laizhou Bay, indicating no obvious Cr pollution in these locations. The limited variation of delta Cr-53 values for samples from a sediment core in Laizhou Bay is also indicative of no obvious Cr pollution in the history. The Cr isotopic compositions of the river sediments are useful for the identification of Cr sources and can be used to advise environmental remediation on Cr pollution. (C) 2020 Published by Elsevier Ltd.
资助机构B-type Strategic Priority Program of the Chinese Academy of Sciences, China [XDB41000000]; National Natural Science Foundation of China, ChinaNational Natural Science Foundation of China (NSFC) [41625013, 41721002, 41888101]; Preresearch Project on Civil Aerospace Technologies of Chinese National Space Administration, China [D020202]; Fundamental Research Funds for the Central Universities of China, China [WK2080000102]
收录类别SCI
语种英语
关键词[WOS]MASS-DEPENDENT FRACTIONATION; CR(VI) REDUCTION; MOJAVE DESERT; CR; FATE; GROUNDWATER; TRANSPORT; SYSTEMATICS; REMOVAL; ESTUARY
研究领域[WOS]Environmental Sciences & Ecology
WOS记录号WOS:000540263400042
引用统计被引频次：5[WOS][WOS记录][WOS相关记录]
文献类型期刊论文
条目标识符http://ir.yic.ac.cnhttp://ir.yic.ac.cn/handle/133337/30489
专题中科院海岸带环境过程与生态修复重点实验室
作者单位1.Univ Sci & Technol China, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China;
2.CAS Ctr Excellence Comparat Planetol, Hefei 230026, Peoples R China;
3.Guangdong Acad Sci, Guangdong Inst Ecoenvironm Sci & Technol, Guangdong Key Lab Integrated Agroenvironm Pollut, Guangzhou 510650, Peoples R China;
4.Natl Reg Joint Engn Res Ctr Soil Pollut Control &, Guangzhou 510650, Peoples R China;
5.Rice Univ, Dept Earth Environm & Planetary Sci, Houston, TX 77005 USA;
6.Chinese Acad Sci, CAS Key Lab Coastal Environm Proc & Ecol Remediat, Yantai Inst Coastal Zone Res YIC, Shandong Key Lab Coastal Environm Proc,YICCAS, Yantai 264003, Peoples R China;
7.Zhejiang Univ, Sch Earth Sci, Inst Environm & Biogeochem eBig, Hangzhou 310027, Peoples R China
推荐引用方式
GB/T 7714He, Xiaoqing,Chen, Guojun,Fang, Ziyao,et al. Source identification of chromium in the sediments of the Xiaoqing River and Laizhou Bay: A chromium stable isotope perspective[J]. ENVIRONMENTAL POLLUTION,2020,264:114686.
APAHe, Xiaoqing.,Chen, Guojun.,Fang, Ziyao.,Liang, Wenjian.,Li, Boda.,...&Sun, Yongge.(2020).Source identification of chromium in the sediments of the Xiaoqing River and Laizhou Bay: A chromium stable isotope perspective.ENVIRONMENTAL POLLUTION,264,114686.
MLAHe, Xiaoqing,et al."Source identification of chromium in the sediments of the Xiaoqing River and Laizhou Bay: A chromium stable isotope perspective".ENVIRONMENTAL POLLUTION 264(2020):114686.
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