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Demethylation of dimethylarsinic acid and arsenobetaine in different organic soils

Title data

Huang, Jen-How ; Scherr, Frank ; Matzner, Egbert:
Demethylation of dimethylarsinic acid and arsenobetaine in different organic soils.
In: Water, Air, & Soil Pollution. Vol. 182 (2007) Issue 1 . - pp. 31-41.
ISSN 0049-6979
DOI: https://doi.org/10.1007/s11270-006-9318-4

Abstract in another language

Methylation and demethylation of arsenic may change substantially the toxicity and mobility of arsenic in soils. Little is known about demethylation of organic arsenic species in organic soils. We incubated dimethylarsinic acid (DMA) and arsenobetaine (AsB) in soils and aqueous soil extracts from a forest floor and fen, in order to investigate demethylation processes. Incubations were conducted at 5°C in the dark under oxic or anoxic conditions. Arsenobetaine demethylated rapidly in all soil extracts with half-lives of 3.6–12 days, estimated from first order kinetic. Demethylation of DMA was relatively slow with half-lives of 187 and 46 days in the forest floor extracts and oxic fen extracts, respectively. In comparison, DMA was stable for 100 days in anoxic fen extracts. The apparent half-lives were much shorter in soils for DMA (1.3–12.6 days) and AsB (0.5–1.9 days) than in soil extracts, suggesting also irreversible AsB and DMA adsorption to soils beside demethylation. An unknown arsenic species and DMA were detected as metabolites of AsB demethylation. The results indicate rapid demethylation of AsB probably via the pathway AsB → Dimethylarsenoylacetate → DMA, followed up by slow demethylation of DMA → monomethylarsonic acid → inorganic As species.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER40622
Keywords: arsenic; methylation; demethylation; forest floor; fen
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Former Professors > Chair Soil Ecology - Univ.-Prof. Dr. Egbert Matzner
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 11 Sep 2015 06:33
Last Modified: 24 Sep 2015 12:57
URI: https://eref.uni-bayreuth.de/id/eprint/19137