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作者:

Zhou, Chunyang (Zhou, Chunyang.) | Gaulier, Camille (Gaulier, Camille.) | Luo, Mingyue (Luo, Mingyue.) | Guo, Wei (Guo, Wei.) | Baeyens, Willy (Baeyens, Willy.) | Gao, Yue (Gao, Yue.)

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摘要:

Belgian coastal sediment serves as an important sink for trace elements, yet a systematic study covering a wide range of elements including redox-sensitive metals (Fe, Mn, and Co), cationic trace metals (Cd, Pb, Ni, Cu, and Zn), oxyanions (P, V, As, and Mo), and sulfide has not been performed and the mechanisms controlling their mobilization were not investigated. Here, a passive sampling technique, Diffusive Gradients in Thin-films (DGT), was used in situ to obtain high resolution concentration profiles of these elements in the sediment porewater. Our results revealed two mobilization mechanisms of cationic trace metals and oxyanions in Belgian coastal sediments, both strongly linked to the cycling of Fe. Mobilization of Co, Pb, Ni, and Cu is controlled by electrogenic sulfur oxidation, acidification of the porewater and dissolution of FeS, while that of oxyanions (P, V, and As) is controlled by reductive dissolution of Fe oxyhydroxides. Constant cationic trace metal to Fe molar ratios were established in FeS, while the oxyanion to Fe ratios in Fe oxyhydroxides differ significantly between sampling stations, which is primarily caused by competing effects. We found no evidence that cationic trace metal mobilization was related to Fe oxyhydroxides, or oxyanion mobilization to FeS. This suggests that particulate organic matter forms the major pathway for cationic trace metal input in coastal sediments and that oxyanions will not be incorporated in FeS but form their own oxyanion-sulfide compound. These findings will contribute to a better understanding of the mobilization mechanisms of cationic trace metals and oxyanions in coastal sediments, and of their biogeochemical cycling in coastal ecosystems.

关键词:

Mobilization mechanisms Cationic trace metals Diffusive gradients in thin-films Belgian coastal sediments Metal/Fe ratios Oxyanions

作者机构:

  • [ 1 ] [Zhou, Chunyang]Vrije Univ Brussel VUB, Analyt Environm & Geochem Dept AMGC, Pleinlaan 2, B-1050 Brussels, Belgium
  • [ 2 ] [Gaulier, Camille]Vrije Univ Brussel VUB, Analyt Environm & Geochem Dept AMGC, Pleinlaan 2, B-1050 Brussels, Belgium
  • [ 3 ] [Luo, Mingyue]Vrije Univ Brussel VUB, Analyt Environm & Geochem Dept AMGC, Pleinlaan 2, B-1050 Brussels, Belgium
  • [ 4 ] [Baeyens, Willy]Vrije Univ Brussel VUB, Analyt Environm & Geochem Dept AMGC, Pleinlaan 2, B-1050 Brussels, Belgium
  • [ 5 ] [Gao, Yue]Vrije Univ Brussel VUB, Analyt Environm & Geochem Dept AMGC, Pleinlaan 2, B-1050 Brussels, Belgium
  • [ 6 ] [Guo, Wei]Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China
  • [ 7 ] [Gaulier, Camille]Univ Lille, LASIR CNRS UMR 8516, Cite Sci, F-59655 Villeneuve Dascq, France

通讯作者信息:

  • [Gao, Yue]Vrije Univ Brussel VUB, Analyt Environm & Geochem Dept AMGC, Pleinlaan 2, B-1050 Brussels, Belgium

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来源 :

ENVIRONMENT INTERNATIONAL

ISSN: 0160-4120

年份: 2020

卷: 145

1 1 . 8 0 0

JCR@2022

ESI学科: ENVIRONMENT/ECOLOGY;

ESI高被引阀值:138

被引次数:

WoS核心集被引频次: 4

SCOPUS被引频次: 26

ESI高被引论文在榜: 0 展开所有

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