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- W3012680354 abstract "In flooded paddy soils, inorganicand methylated thioarsenatescontribute substantially to arsenic speciation besides the much-better-investigatedoxyarsenic species, and thioarsenate uptake into rice plants has recentlybeen shown. To better understand their fate when soil redox conditionschange, that is, from flooding to drainage to reflooding, batch incubationsand unplanted microcosm experiments were conducted with two paddysoils covering redox potentials from EH −260 to +200 mV. Further, occurrence of thioarsenates inthe oxygenated rice rhizosphere was investigated using planted rhizoboxexperiments. Soil flooding resulted in rapid formation of inorganicthioarsenates with a dominance of trithioarsenate. Maximum thiolationof inorganic oxyarsenic species was 57% at EH −130 mV and oxidation caused nearly complete dethiolation.Only monothioarsenate formed again upon reflooding and was the majorinorganic thioarsenate detected in the rhizosphere. Maximum thiolationof mono- and dimethylated oxyarsenates was about 70% and 100%, respectively,below EH 0 mV. Dithiolated species dominatedover monothiolated species below EH −100mV. Among all thioarsenates, dimethylated monothioarsenate showedthe least transformation upon prolonged oxidation. It also was themajor thiolated arsenic species in the rhizosphere with concentrationscomparable to its precursor dimethylated oxyarsenate, which is especiallycritical since dimethylated monothioarsenate is highly carcinogenic." @default.
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- W3012680354 date "2020-03-17" @default.
- W3012680354 modified "2023-09-23" @default.
- W3012680354 title "RedoxDependence of Thioarsenate Occurrence in PaddySoils and the Rice Rhizosphere" @default.
- W3012680354 doi "https://doi.org/10.1021/acs.est.9b05639.s001" @default.
- W3012680354 hasPublicationYear "2020" @default.
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