Thiolated arsenic species observed in rice paddy pore waters

Wang, Jiajia; Kerl, Carolin F.; Hu, Pengjie; Martín, María; Mu, Tingzhen; Brüggenwirth, Lena; Wu, Guangmei; Said-Pullicino, Daniel; Romani, Marco; Wu, L.H.; Planer-Friedrich, Britta

doi:10.1038/s41561-020-0533-1

Cited by 81 publications

(85 citation statements)

References 48 publications

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“…High dissolved sulfide might trigger the formation of thioarsenate/thioarsenite in soil porewater (Wang et al,13 2020b). However, due to thioarsenate/thioarsenite was strongly suppressed by high dissolved Fe in reducing soils (Wang et al, 2020b), thioarsenate/thioarsenite was not detected in the oxic-anoxic transition zone in this study.…”

Section: Resultscontrasting

confidence: 67%

Arsenic behavior across soil-water interfaces in paddy soils: Coupling, decoupling and speciation

et al. 2021

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The sharp redox gradient at soil-water interfaces (SWI) plays a key role in controlling arsenic (As) translocation and transformation in paddy soils. When Eh drops, As is released to porewater from solid iron (Fe) and manganese (Mn) minerals and reduced to arsenite. However, the coupling or decoupling processes operating within the redox gradient at the SWI in flooded paddy soils remain poorly constrained due to the lack of direct evidence. In this paper, we reported the mm-scale mapping of Fe, As and other associated elements across the redox gradient in the SWI of five different paddy soils. The results showed a strong positive linear relationship between dissolved Fe, Mn, As, and phosphorus (P) in 4 out of the 5 paddy soils, indicating the general coupling of these elements. However, decoupling of Fe, Mn and As was observed in one of the paddy soils. In this soil, distinct releasing profiles of Mn, As and Fe were observed, and the releasing order followed the redox ladder. Further investigation of As species showed the ratio of arsenite to total As dropped from 100% to 75.5% and then kept stable along depth of the soil profile, which indicates a dynamic equilibrium between arsenite oxidization and arsenate reduction. This study provides direct evidence of multi-elements' interaction along redox gradient of SWI in paddy soils.

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Section: Resultscontrasting

confidence: 67%

Arsenic behavior across soil-water interfaces in paddy soils: Coupling, decoupling and speciation

et al. 2021

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“…In submerged paddy soils, As methylation is mediated primarily by sulfate reducing bacteria, while methylated As species can also be demethylated by some methanogens (Chen, Li et al, 2019). Thioarsenates, including inorganic thioarsenates and methylated thioarsenates, are a further group of As species that have been detected in the pore waters of anaerobic paddy soils (Wang, Kerl et al, 2020). Inorganic thioarsenates are produced by reactions of arsenite, sulfide, and zerovalent sulfur and are predominantly observed in neutral to alkaline soils (Wang, Kerl et al, 2020).…”

Section: Arsenic Speciation In Soilmentioning

confidence: 99%

“…Thioarsenates, including inorganic thioarsenates and methylated thioarsenates, are a further group of As species that have been detected in the pore waters of anaerobic paddy soils (Wang, Kerl et al, 2020). Inorganic thioarsenates are produced by reactions of arsenite, sulfide, and zerovalent sulfur and are predominantly observed in neutral to alkaline soils (Wang, Kerl et al, 2020). Methylated thioarsenates are formed by nucleophilic attack of sulfide on the oxy species MMAs and DMAs and are mostly observed in neutral to acidic soils (Wang, Kerl et al, 2020).…”

Section: Arsenic Speciation In Soilmentioning

confidence: 99%

“…Inorganic thioarsenates are produced by reactions of arsenite, sulfide, and zerovalent sulfur and are predominantly observed in neutral to alkaline soils (Wang, Kerl et al, 2020). Methylated thioarsenates are formed by nucleophilic attack of sulfide on the oxy species MMAs and DMAs and are mostly observed in neutral to acidic soils (Wang, Kerl et al, 2020). Thioarsenates can contribute up to 10% of the total As in the porewater of paddy soils without sulfate fertilization and up to 60% in microcosm experiments with sulfate additions (Halder et al, 2017).…”

Section: Arsenic Speciation In Soilmentioning

confidence: 99%

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The roles of membrane transporters in arsenic uptake, translocation and detoxification in plants

Tang

Zhao

2020

Critical Reviews in Environmental Science and Technology

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Arsenic (As) is one of the most toxic environmental contaminants that is ubiquitously distributed in the environment. Millions of people worldwide suffer from As poisoning due to As exposure from drinking water and dietary intake. Reducing As accumulation in food crops is of great importance for food safety and public health. Limiting As accumulation in food crops or phytoremediation of Ascontaminated soil depend on a detailed understanding of As uptake and transport in plants. Plants take up and transport different As species via various membrane transporters that are localized in different tissues or cell types and with different orientations. Many of these transporters are responsible for the uptake and translocation of essential or beneficial nutrients, but can also transport As species inadvertently due to imperfect selectivity. Herein, we summarize the roles of transporters involved in the uptake, transport, accumulation and detoxification of different As species and the regulation mechanisms of these transporters in plants. Potential uses of these transporters for breeding or genetic engineering crops of low As accumulation or plants for phytoremediation are also discussed.

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“…The percentage of TAs V in total arsenic can account for as much as 80% in some geothermal water samples [ 12 ] and 68% in fresh groundwater samples [ 13 ]. Furthermore, TAs is also observed in the rice paddy pore waters [ 14 , 15 ], and a few studies on the toxicity of TAs V show that the toxicity of monothioarsenate is similar to that of arsenate but lower than that of arsenite [ 16 ]. Based on these findings, studies on the distribution, characteristics, and fate of thioarsenic species in the aquatic environment are attracting increasing attention in recent decades.…”

Section: Introductionmentioning

confidence: 99%

Sorption of Monothioarsenate to the Natural Sediments and Its Competition with Arsenite and Arsenate

Shan

Zhang

Peng

et al. 2021

IJERPH

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Monothioarsenate (MTAsV) is one of the major arsenic species in sulfur- or iron-rich groundwater, and the sediment adsorption of MTAsV plays an important role in arsenic cycling in the subsurface environment. In this study, batch experiments and characterization are conducted to investigate the sorption characteristic and mechanism of MTAsV on natural sediments and the influences of arsenite and arsenate. Results show that MTAsV adsorption on natural sediments is similar to arsenate and arsenite, manifested by a rapid early increasing stage, a slowly increasing stage at an intermediate time until 8 h, before finally approaching an asymptote. The sediment sorption for MTAsV mainly occurs on localized sites with high contents of Fe and Al, where MTAsV forms a monolayer on the surface of natural sediments via a chemisorption mechanism and meanwhile the adsorbed MTAsV mainly transforms into other As species, such as AlAs, Al-As-O, and Fe-As-O compounds. At low concentration, MTAsV sorption isotherm by natural sediments becomes the Freundlich isotherm model, while at high concentration of MTAsV, its sorption isotherm becomes the Langmuir isotherm model. The best-fitted maximum adsorption capacity for MTAsV adsorption is about 362.22 μg/g. Furthermore, there is a competitive effect between MTAsV and arsenate adsorption, and MTAsV and arsenite adsorption on natural sediments. More specifically, the presence of arsenite greatly decreases MTAsV sorption, while the presence of MTAsV causes a certain degree of reduction of arsenite adsorption on the sediments before 4 h, and this effect becomes weaker when approaching the equilibrium state. The presence of arsenate greatly decreases MTAsV sorption and the presence of MTAsV also greatly decreases arsenate sorption. These competitive effects may greatly affect MTAsV transport in groundwater systems and need more attention in the future.

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Thiolated arsenic species observed in rice paddy pore waters

Cited by 81 publications

References 48 publications

Arsenic behavior across soil-water interfaces in paddy soils: Coupling, decoupling and speciation

Arsenic behavior across soil-water interfaces in paddy soils: Coupling, decoupling and speciation

The roles of membrane transporters in arsenic uptake, translocation and detoxification in plants

Sorption of Monothioarsenate to the Natural Sediments and Its Competition with Arsenite and Arsenate

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