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Identifying the Sources and Processes of Mercury in Subtropical Estuarine and Ocean Sediments Using Hg Isotopic Composition
Runsheng Yin; Xinbin Feng; Baowei Chen; Junjun Zhang; Wenxiong Wang; Xiangdong Li
2015
Source PublicationEnvironmental Science & Technology
Volume49Issue:3Pages:1347-1355
Abstract
The concentrations and isotopic compositions of mercury (Hg) in surface sediments of the Pearl River Estuary (PRE) and the South China Sea (SCS) were analyzed. The data revealed significant differences between the total Hg (THg) in fine-grained sediments collected from the PRE (8-251 mu g kg(-1)) and those collected from the SCS (12-83 mu g kg(-1)). Large spatial variations in Hg isotopic compositions were observed in the SCS (delta Hg-202, from -2.82 to -2.10 parts per thousand; Delta Hg-199, from +0.21 to +0.45 parts per thousand) and PRE (delta Hg-202, from -2.80 to -0.68 parts per thousand; Delta Hg-199, from -0.15 to +0.16 parts per thousand). The large positive Delta Hg-199 in the SCS indicated that a fraction of Hg has undergone Hg2+ photoreduction processes prior to incorporation into the sediments. The relatively negative Delta Hg-199 values in the PRE indicated that photoreduction of Hg is not the primary route for the removal of Hg from the water column. The riverine input of fine particles played an important role in transporting Hg to the PRE sediments. In the deep ocean bed of the SCS, source-related signatures of Hg isotopes may have been altered by natural geochemical processes (e.g., Hg2+ photoreduction and preferential adsorption processes). Using Hg isotope compositions, we estimate that river deliveries of Hg from industrial and urban sources and natural soils could be the main inputs of Hg to the PRE. However, the use of Hg isotopes as tracers in source attribution could be limited because of the isotope fractionation by natural processes in the SCS.
Subject Area环境地球化学
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/5972
Collection环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
环境地球化学国家重点实验室
Recommended Citation
GB/T 7714
Runsheng Yin,Xinbin Feng,Baowei Chen,et al. Identifying the Sources and Processes of Mercury in Subtropical Estuarine and Ocean Sediments Using Hg Isotopic Composition[J]. Environmental Science & Technology,2015,49(3):1347-1355.
APA Runsheng Yin,Xinbin Feng,Baowei Chen,Junjun Zhang,Wenxiong Wang,&Xiangdong Li.(2015).Identifying the Sources and Processes of Mercury in Subtropical Estuarine and Ocean Sediments Using Hg Isotopic Composition.Environmental Science & Technology,49(3),1347-1355.
MLA Runsheng Yin,et al."Identifying the Sources and Processes of Mercury in Subtropical Estuarine and Ocean Sediments Using Hg Isotopic Composition".Environmental Science & Technology 49.3(2015):1347-1355.
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