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

Abstract：

: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.

journal_name

Mar Pollut Bull

journal_title

Marine pollution bulletin

authors

Wang H,Liu R,Wang Q,Xu F,Men C,Shen Z

doi

10.1016/j.marpolbul.2016.08.076

subject

Has Abstract

pub_date

2016-12-15 00:00:00

pages

125-131

issue

1-2

eissn

0025-326X

issn

1879-3363

pii

S0025-326X(16)30711-1

journal_volume

113

pub_type

杂志文章

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