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The key roles of Fe oxyhydroxides and humic substances during the transformation of exogenous arsenic in a redox-alternating acidic paddy soil.

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Title: The key roles of Fe oxyhydroxides and humic substances during the transformation of exogenous arsenic in a redox-alternating acidic paddy soil.
Authors: Hong, Zebin1,2,3 (AUTHOR), Hu, Shiwen1,2 (AUTHOR), Yang, Yang2 (AUTHOR), Deng, Ziwei2,4 (AUTHOR), Li, Xiaomin5 (AUTHOR), Liu, Tongxu1,2 (AUTHOR) txliu@soil.gd.cn, Li, Fangbai2 (AUTHOR)
Source: Water Research. Aug2023, Vol. 242, pN.PAG-N.PAG. 1p.
Subjects: Arsenic, Humus, Acid soils, Soil particles, Reactive oxygen species, Biogeochemical cycles, Arsenic removal (Water purification), Nitrogen fixation
Abstract: • Fe minerals and HS dominantly controlled exogenous As mobility under redox condition. • Exogenous As(V) was reduced during flooding and only As(V) existed during drainage. • Deprotonation of paddy soil enhanced As(III) immobilization and As(V) mobilization. • Reductive transformation of Fe minerals and changes in surface sites controlled As species. • A process-based model quantified the role of each reaction in the As specie variation. Arsenic (As) from mine wastewater is a significant source for acidic paddy soil pollution, and its mobility can be influenced by alternating redox conditions. However, mechanistic and quantitative insights into the biogeochemical cycles of exogenous As in paddy soil are still lacking. Herein, the variations of As species in paddy soil spiking with As(III) or As(V) were investigated in the process of 40 d of flooding followed 20 d of drainage. During flooding process, available As was immobilized in paddy soil spiking As(III) and the immobilized As was activated in paddy soil spiking As(V) owing to deprotonation. The contributions of Fe oxyhydroxides and humic substances (HS) to As immobilization in paddy soil spiking As(III) were 80.16% and 18.64%, respectively. Whereas the contributions of Fe oxyhydroxides and HS to As activation in paddy soil spiking As(V) were 47.9% and 52.1%, respectively. After entering drainage, available As was mainly immobilized by Fe oxyhydroxides and HS and adsorbed As(III) was oxidized. The contribution of Fe oxyhydroxides to As fixation in paddy soil spiking As(III) and As(V) was 88.82% and 90.26%, respectively, and of HS to As fixation in paddy soil spiking As(III) and As(V) was 11.12% and 8.95%, respectively. Based on the model fitting results, the activation of Fe oxyhydroxides and HS bound As followed with available As(V) reduction were key processes during flooding. This may be because the dispersion of soil particles and release of soil colloids activated the adsorbed As. Immobilization of available As(III) by amorphous Fe oxyhydroxides followed with adsorbed As(III) oxidation were key processes during drainage. This may be ascribe to the occurrence of coprecipitation and As(III) oxidation mediated by reactive oxygen species from Fe(II) oxidation. The results are beneficial for a deeper understanding of As species transformation at the interface of paddy soil-water as well as an estimation pathway for the impacts of key biogeochemical cycles on exogenous As species under a redox-alternating condition. [Display omitted] [ABSTRACT FROM AUTHOR]
Copyright of Water Research is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
  Group: Ti
  Data: The key roles of Fe oxyhydroxides and humic substances during the transformation of exogenous arsenic in a redox-alternating acidic paddy soil.
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  Data: <searchLink fieldCode="AR" term="%22Hong%2C+Zebin%22">Hong, Zebin</searchLink><relatesTo>1,2,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hu%2C+Shiwen%22">Hu, Shiwen</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yang%2C+Yang%22">Yang, Yang</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Deng%2C+Ziwei%22">Deng, Ziwei</searchLink><relatesTo>2,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Xiaomin%22">Li, Xiaomin</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Tongxu%22">Liu, Tongxu</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> txliu@soil.gd.cn</i><br /><searchLink fieldCode="AR" term="%22Li%2C+Fangbai%22">Li, Fangbai</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Water+Research%22">Water Research</searchLink>. Aug2023, Vol. 242, pN.PAG-N.PAG. 1p.
– Name: Subject
  Label: Subjects
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  Data: <searchLink fieldCode="DE" term="%22Arsenic%22">Arsenic</searchLink><br /><searchLink fieldCode="DE" term="%22Humus%22">Humus</searchLink><br /><searchLink fieldCode="DE" term="%22Acid+soils%22">Acid soils</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+particles%22">Soil particles</searchLink><br /><searchLink fieldCode="DE" term="%22Reactive+oxygen+species%22">Reactive oxygen species</searchLink><br /><searchLink fieldCode="DE" term="%22Biogeochemical+cycles%22">Biogeochemical cycles</searchLink><br /><searchLink fieldCode="DE" term="%22Arsenic+removal+%28Water+purification%29%22">Arsenic removal (Water purification)</searchLink><br /><searchLink fieldCode="DE" term="%22Nitrogen+fixation%22">Nitrogen fixation</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • Fe minerals and HS dominantly controlled exogenous As mobility under redox condition. • Exogenous As(V) was reduced during flooding and only As(V) existed during drainage. • Deprotonation of paddy soil enhanced As(III) immobilization and As(V) mobilization. • Reductive transformation of Fe minerals and changes in surface sites controlled As species. • A process-based model quantified the role of each reaction in the As specie variation. Arsenic (As) from mine wastewater is a significant source for acidic paddy soil pollution, and its mobility can be influenced by alternating redox conditions. However, mechanistic and quantitative insights into the biogeochemical cycles of exogenous As in paddy soil are still lacking. Herein, the variations of As species in paddy soil spiking with As(III) or As(V) were investigated in the process of 40 d of flooding followed 20 d of drainage. During flooding process, available As was immobilized in paddy soil spiking As(III) and the immobilized As was activated in paddy soil spiking As(V) owing to deprotonation. The contributions of Fe oxyhydroxides and humic substances (HS) to As immobilization in paddy soil spiking As(III) were 80.16% and 18.64%, respectively. Whereas the contributions of Fe oxyhydroxides and HS to As activation in paddy soil spiking As(V) were 47.9% and 52.1%, respectively. After entering drainage, available As was mainly immobilized by Fe oxyhydroxides and HS and adsorbed As(III) was oxidized. The contribution of Fe oxyhydroxides to As fixation in paddy soil spiking As(III) and As(V) was 88.82% and 90.26%, respectively, and of HS to As fixation in paddy soil spiking As(III) and As(V) was 11.12% and 8.95%, respectively. Based on the model fitting results, the activation of Fe oxyhydroxides and HS bound As followed with available As(V) reduction were key processes during flooding. This may be because the dispersion of soil particles and release of soil colloids activated the adsorbed As. Immobilization of available As(III) by amorphous Fe oxyhydroxides followed with adsorbed As(III) oxidation were key processes during drainage. This may be ascribe to the occurrence of coprecipitation and As(III) oxidation mediated by reactive oxygen species from Fe(II) oxidation. The results are beneficial for a deeper understanding of As species transformation at the interface of paddy soil-water as well as an estimation pathway for the impacts of key biogeochemical cycles on exogenous As species under a redox-alternating condition. [Display omitted] [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Water Research is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.watres.2023.120286
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Arsenic
        Type: general
      – SubjectFull: Humus
        Type: general
      – SubjectFull: Acid soils
        Type: general
      – SubjectFull: Soil particles
        Type: general
      – SubjectFull: Reactive oxygen species
        Type: general
      – SubjectFull: Biogeochemical cycles
        Type: general
      – SubjectFull: Arsenic removal (Water purification)
        Type: general
      – SubjectFull: Nitrogen fixation
        Type: general
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      – TitleFull: The key roles of Fe oxyhydroxides and humic substances during the transformation of exogenous arsenic in a redox-alternating acidic paddy soil.
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            NameFull: Hong, Zebin
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            NameFull: Hu, Shiwen
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            NameFull: Yang, Yang
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              Text: Aug2023
              Type: published
              Y: 2023
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              Value: 242
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