The dynamics of arsenic in four paddy fields in the Bengal delta

被引：88

作者：

Stroud, Jacqueline L. ^{[1
]}

Norton, Gareth J. ^{[2
]}

Islam, M. Rafiqul ^{[3
]}

Dasgupta, Tapash ^{[4
]}

White, Rodger P. ^{[1
]}

Price, Adam H. ^{[2
]}

Meharg, Andrew A. ^{[2
]}

McGrath, Steve P. ^{[1
]}

Zhao, Fang-Jie ^{[1
]}

机构：

[1] Rothamsted Res, Harpenden AL5 2JQ, Herts, England

[2] Univ Aberdeen, Inst Biol & Environm Sci, Aberdeen AB24 3UU, Scotland

[3] Bangladesh Agr Univ, Dept Soil Sci, Mymensingh 2202, Bangladesh

[4] Univ Calcutta, Inst Agr Sci, Kolkata 700019, W Bengal, India

来源：

ENVIRONMENTAL POLLUTION | 2011年 / 159卷 / 04期

基金：

英国生物技术与生命科学研究理事会;

关键词：

Arsenic speciation; Soil pore water; Rice; Irrigation; IRRIGATED RICE FIELDS; TEMPORAL VARIABILITY; SPATIAL-DISTRIBUTION; BANGLADESH; ACCUMULATION; SOILS; GROUNDWATER; EXPOSURE; BARLEY; WHEAT;

D O I：

10.1016/j.envpol.2010.12.016

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Irrigation with arsenic contaminated groundwater in the Bengal Delta may lead to As accumulation in the soil and rice grain. The dynamics of As concentration and speciation in paddy fields during dry season (boro) rice cultivation were investigated at 4 sites in Bangladesh and West Bengal, India. Three sites which were irrigated with high As groundwater had elevated As concentrations in the soils, showing a significant gradient from the irrigation inlet across the field. Arsenic concentration and speciation in soil pore water varied temporally and spatially; higher As concentrations were associated with an increasing percentage of arsenite, indicating a reductive mobilization. Concentrations of As in rice grain varied by 2-7 fold within individual fields and were poorly related with the soil As concentration. A field site employing alternating flooded-dry irrigation produced the lowest range of grain As concentration, suggesting a lower soil As availability caused by periodic aerobic conditions. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：947 / 953

页数：7

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