Bioavailability and risk assessment of arsenic in surface sediments of the Yangtze River estuary

被引：19

作者：

Wang, Haotian ^{[1
]}

Liu, Ruimin ^{[1
]}

Wang, Qingrui ^{[1
]}

Xu, Fei ^{[1
]}

Men, Cong ^{[1
]}

Shen, Zhenyao ^{[1
]}

机构：

[1] Beijing Normal Univ, Sch Environm, State Key Lab Water Environm Simulat, 19 Xinjiekouwai St, Beijing 100875, Peoples R China

来源：

MARINE POLLUTION BULLETIN | 2016年 / 113卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

Arsenic; Fraction; Speciation; Bioavailability; Yangtze; River estuary; HEAVY-METAL CONTAMINATION; SEQUENTIAL EXTRACTION PROCEDURE; EAST CHINA SEA; SOURCE IDENTIFICATION; MICROBIAL REDUCTION; ENVIRONMENTAL RISK; SPATIAL VARIATION; CHANGJIANG RIVER; INTERTIDAL ZONE; COASTAL AREA;

D O I：

10.1016/j.marpolbul.2016.08.076

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

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. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：125 / 131

页数：7

共 62 条

[61] Sequence of the main geochemical controls on the Cu and Zn fractions in the Yangtze River estuarine sediments [J].