Arsenic in surface sediments of the southwestern coast of Laizhou Bay, China: Speciation, spatial distribution, sources and contamination risk assessment

Jinfeng Zhang

doi:10.1016/j.marpolbul.2026.120243

Arsenic in surface sediments of the southwestern coast of Laizhou Bay, China: Speciation, spatial distribution, sources and contamination risk assessment

2026-08-08

0

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AI

J

Jinfeng Zhang *

S

Shengxiao Zhang

F

Feng Wang

Z

Zhong Zhuang

X

Xue Yang

C

Chenyu Du

DOI：10.1016/j.marpolbul.2026.120243

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Abstract

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• Total arsenic exhibited a distinct west-to-east declining spatial trend, with the maximum concentration (34.71 μg g−1) occurring at Xiaoqinghe River estuary due to intensive chemical and petrochemical industrial inputs. • Modified BCR sequential extraction revealed residual arsenic as the dominant fraction; the proportion of bioavailable acid-soluble arsenic increased toward offshore waters, suggesting potential secondary release risks under tidal disturbance. • Multiple pollution assessment tools (EF, Igeo, Eri，RAC, MF) indicated low overall ecological risk across the study area; only riverine sediments along Xiaoqinghe River suffered moderate arsenic contamination.

Keywords:

Arsenic

Contamination assessment

Coastal zone

Marine sediment

Surface sediment

Geochemical fractionation

Arsenic in surface sediments of the southwestern coast of Laizhou Bay, China: Speciation, spatial distribution, sources and contamination risk assessment

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