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Iron plaque at rice roots : no barrier for methylated thioarsenates

Title data

Kerl, Carolin ; Boffa Ballaran, Tiziana ; Planer-Friedrich, Britta:
Iron plaque at rice roots : no barrier for methylated thioarsenates.
In: Environmental Science & Technology. Vol. 53 (2019) Issue 23 . - pp. 13666-13674.
ISSN 0013-936X
DOI: https://doi.org/10.1021/acs.est.9b04158

Abstract in another language

Iron (hydr)oxide coating at rice roots, so-called iron plaque (IP), is often an important barrier for uptake of inorganic oxyarsenic species and their accumulation in rice grains. Sorption of methylated thioarsenates, which can co-exist with inorganic and methylated oxyarsenates in paddy soils, was not studied yet, even though these toxic species were detected in xylem and grains of rice plants before. Hydroponic experiments at pH 6.5 with 20 day-old rice plants showed lower net arsenic enrichment in IP for plants exposed to monomethylthioarsenate (MMMTA) compared to monomethylarsenate (MMA) and no enrichment for dimethylmonothioarsenate (DMMTA). Goethite was the dominant mineral phase in our IP. Sorption experiments with synthesized goethite and ferrihydrite revealed a 30-times-higher sorption capacity for MMMTA to amorphous ferrihydrite than to crystalline goethite, comparable to methylated oxyarsenates. No evidence for direct MMMTA binding was found. Instead, we postulate that MMMTA transformation to MMA is a prerequisite for removal. DMMTA showed very little sorption, even to amorphous ferrihydrite, which is in line with a lack of direct binding and reported slow transformation to dimethylarsenate. Our study implies that IP is no effective barrier for methylated thioarsenates and that especially DMMTA is very mobile with a high risk of uptake in rice plants.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER154189
Institutions of the University: Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professor Environmental Geochemistry Group
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professor Environmental Geochemistry Group > Professor Environmental Geochemistry - Univ.-Prof. Dr. Britta Planer-Friedrich
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 550 Earth sciences, geology
Date Deposited: 23 Jan 2020 09:20
Last Modified: 23 Jan 2020 09:20
URI: https://eref.uni-bayreuth.de/id/eprint/53850