Bioavailability and risk assessment of arsenic in surface sediments of the Yangtze River estuary 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Marine Pollution Bulletin
年/卷/期
2000 / 113 / 1-2
页码
125-131
出版商
Elsevier B.V., P.O. Box 800 Kidlington Oxford OX5 1DX United Kingdom
ISSN号
0025-326X
作者
Wang, Haotian;Liu, Ruimin;Wang, Qingrui;Xu, Fei;Men, Cong;Shen, Zhenyao;
摘要
The bioavailability and risk assessment of As were studied in sediments of the Yangtze River estuary (YRE). Results showed that residual fractions dominated the As partition (>85%), which attenuated overall bioavailability. After the residual fraction, As mainly partitioned into the Fe-Mn oxides fraction (3.16-4.22%). Arsenic bound to Fe-Mn oxides was higher in wet seasons. The carbonate fraction was minimal, which may result from the negative state presence of As in sediments. According to the risk assessment code, the YRE was classified as low risk. Additionally, the reduction of As(V) to As(III) may occur due to the reducing condition in wet seasons. Considering As(III) is more toxic and mobile, As bound to the exchangeable and Fe-Mn oxides fractions may have more potential ecological risk. Thus, the speciation and fraction should be both considered on the ecological risk of As in sediments of the YRE.
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关键词/主题词
Rivers;Bioavailability;Arsenic;Rainy season;Carbonates;Estuaries;Environmental conditions;Sediments;Risks;Risk assessment;Speciation;Marine pollution;Risk factors;oxides;Water pollution;Marine;Brackish;Freshwater;
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