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Arsenic fractionation and mobilization in agricultural soils of NE Punjab, India

Title data

Paikaray, Susanta ; Peiffer, Stefan:
Arsenic fractionation and mobilization in agricultural soils of NE Punjab, India.
In: Applied Geochemistry. Vol. 139 (April 2022) . - No. 105255.
ISSN 0883-2927
DOI: https://doi.org/10.1016/j.apgeochem.2022.105255

Abstract in another language

Bioavailability of arsenic (As) is strongly controlled by its partitioning in different soil constituents which alternatively determines its toxicity extent even though total As contents of soils might be comparable. Five soil samples with contrasting crop practices and physico-chemical nature were examined for As contents in different constituents by sequential extraction process and its mobility under oxic and anoxic conditions in presence of competing anions. Soils are of alkaline nature (pH 8.2–8.7) with high carbon content (C/N = 10.3–11.9). Mobilization of As increases with time and enhanced by presence of competitive anions (NO3− + PO43-) with a greater mobility under anoxic condition compared to that in oxic condition reaching up to ∼19% of soil As. Overall decrease in pH was observed that was better pronounced under oxic conditions and drop in pH was relatively more in NO3− + PO43- containing reactors. Fluoride, Cl− and SO42- release were negligible within 21 days where lesser SO42- was measured in anoxic condition contrary to F− and Cl−. Almost complete NO3− and PO43- retention under anoxic reactors together with greater As release imply an ion exchange mechanism of As mobilization. Poor bioavailability of soil As was envisaged because of negligible water exchangeable As contents. However, a ligand exchange mechanism is proposed between PO43- and HAsO42- resulting greatest As extraction through phosphate extraction process where significant As contents remained intact onto the crystalline phases.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Alluvial plain; Geogenic arsenic; Ligand exchange; Alkaline soil; Sequential extraction
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology > Chair Hydrology - Univ.-Prof. Dr. Stefan Peiffer
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 550 Earth sciences, geology
Date Deposited: 02 Mar 2022 07:10
Last Modified: 02 Mar 2022 07:10
URI: https://eref.uni-bayreuth.de/id/eprint/68843