Arsenic dynamics in paddy soil under traditional manuring practices in Bangladesh

Hossain, Mahmud; Mestrot, Adrien; Norton, Gareth J.; Deacon, Claire; Islam, M. Rafiqul; Meharg, Andrew A. (2021). Arsenic dynamics in paddy soil under traditional manuring practices in Bangladesh. Environmental pollution, 268(Part A), p. 115821. Elsevier Science 10.1016/j.envpol.2020.115821

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Fertilization with organic matter (farm yard manure and/or rice straw) is thought to enhance arsenic (As) mobilization into soil porewaters, with subsequent As assimilation by rice roots leading to enhanced translocation to the grain. Here, interlinked experiments (field manuring and soil batch culture) were conducted to find the effect of organic matter at a field application rate practiced in Bangladesh (5 t/ha) on As mobilization in soil for paddies impacted by As contaminated groundwater irrigation, a wide- spread phenomenon in Bangladesh where the experiments were conducted. Total As concentration in a paddy soil (Sonargaon) ranged from 21.9 to 8.1 mg/kg down the soil profile and strongly correlated with TOC content. Arsenic, Fe, Mn, and DOC release into soil solution, and As speciation, are intimately linked to OM amendment, soil depth and temporal variation. Organic matter amendments lead to increased mobilization of As into both soil porewaters and standing surface waters. The As speciation in the porewater was dominated by inorganic As (Asi) (arsenite and arsenate), with traces amounts of meth- ylated species (DMAV and MMAV) only being found with OM amendment. It was noted in field trials that OM fertilization greatly enhanced As mobility to surface waters, which may have major implications for the fate of As in paddy agronomic ecosystems.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography > Physical Geography > Unit Soil Science
08 Faculty of Science > Institute of Geography
08 Faculty of Science > Institute of Geography > Physical Geography

UniBE Contributor:

Mestrot, Adrien

Subjects:

500 Science > 550 Earth sciences & geology
900 History > 910 Geography & travel

ISSN:

0269-7491

Publisher:

Elsevier Science

Language:

English

Submitter:

Andrea Katja Weber

Date Deposited:

11 Feb 2021 11:44

Last Modified:

11 Feb 2021 11:44

Publisher DOI:

10.1016/j.envpol.2020.115821

BORIS DOI:

10.48350/149586

URI:

https://boris.unibe.ch/id/eprint/149586

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