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Purpose <p>This study aimed to elucidate the mechanisms underlying the markedly limited dissolution of As in Andosols under reducing conditions, focusing on key factors such as As transformation, iron oxide reduction, and soil affinity for As(III).</p> Methods <p>The dissolution and speciation of As and the generation of Fe(II) in Andosols were compared with those in soils derived from Fluvisols during long-term anaerobic incubation. The affinity for As(III) was evaluated by comparing the solid–solution distribution ratio during the incubation and sorption experiments using reduced soils.</p> Results <p>The levels of dissolved As remained consistently lower in the Andosols than in other soils throughout the incubation period. Although the decline in Eh and the reduction of As(V) were slower, the final proportion of As(III), which is more soluble than As(V), was similar, except in one Andosol. This was attributed to the fact that a smaller fraction of As(III) was transformed into S-bound As in the Andosols. The increased Fe(II) indicated the dissolution of As-bearing Fe oxides and the loss of As(III) sorption sites; however, residual amorphous Fe oxides persisted at higher levels in the Andosols. The distribution of As(III) between the solution and solids during the incubation and sorption experiments revealed that the Andosols retained a significantly higher affinity for As(III) under reducing conditions.</p> Conclusion <p>The markedly limited dissolution of As in Andosols under reducing conditions can be attributed primarily to their strong As(III) affinity, which is likely governed by mineralogical characteristics, rather than to slow and limited As(V) reduction.</p>

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Mechanisms underlying the markedly limited As dissolution in Andosols under reducing conditions

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Aomi Suda,
  • Koji Baba,
  • Mizuki Morishita,
  • Manami Furuya,
  • Noriko Yamaguchi

摘要

Purpose

This study aimed to elucidate the mechanisms underlying the markedly limited dissolution of As in Andosols under reducing conditions, focusing on key factors such as As transformation, iron oxide reduction, and soil affinity for As(III).

Methods

The dissolution and speciation of As and the generation of Fe(II) in Andosols were compared with those in soils derived from Fluvisols during long-term anaerobic incubation. The affinity for As(III) was evaluated by comparing the solid–solution distribution ratio during the incubation and sorption experiments using reduced soils.

Results

The levels of dissolved As remained consistently lower in the Andosols than in other soils throughout the incubation period. Although the decline in Eh and the reduction of As(V) were slower, the final proportion of As(III), which is more soluble than As(V), was similar, except in one Andosol. This was attributed to the fact that a smaller fraction of As(III) was transformed into S-bound As in the Andosols. The increased Fe(II) indicated the dissolution of As-bearing Fe oxides and the loss of As(III) sorption sites; however, residual amorphous Fe oxides persisted at higher levels in the Andosols. The distribution of As(III) between the solution and solids during the incubation and sorption experiments revealed that the Andosols retained a significantly higher affinity for As(III) under reducing conditions.

Conclusion

The markedly limited dissolution of As in Andosols under reducing conditions can be attributed primarily to their strong As(III) affinity, which is likely governed by mineralogical characteristics, rather than to slow and limited As(V) reduction.