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Rainfall reduces arsenic in rice by triggering a reaction that limits plant uptake. This Fenton-like process, driven by hydrogen peroxide in rainwater, lowers grain arsenic levels, impacting rice safety and distribution.

Keywords:
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Area of Science:

  • Environmental Chemistry
  • Soil Science
  • Plant Physiology

Background:

  • Rainwater input to paddy soils decreases grain arsenic.
  • A Fenton-like reaction involving hydrogen peroxide and ferrous iron is hypothesized to impede arsenic uptake by rice plants.
  • This hypothesis has not been experimentally verified.

Purpose of the Study:

  • To test the hypothesis that rainwater-borne hydrogen peroxide triggers a Fenton-like reaction, reducing arsenic uptake in rice.
  • To investigate the impact of rainfall variation on arsenic accumulation in rice grains.
  • To assess the national-scale implications of rainfall regimes on arsenic contamination in rice.

Main Methods:

  • Mesocosm experiments were conducted to simulate rainwater input and its effects on paddy soil.
  • Measurements included soil redox potential, hydroxyl radical generation, and arsenic speciation in soil porewater.
  • Rice was cultivated under varying hydrogen peroxide fluxes, and grain arsenic levels were quantified.

Main Results:

  • Rainwater-borne hydrogen peroxide initiated hydroxyl radical (•OH) generation, increasing soil redox potential.
  • This process oxidized arsenite to less phytoavailable arsenate, reducing arsenic uptake by rice plants.
  • Higher rainfall correlated with lower arsenic concentrations in rice grains, and rainfall patterns influenced national arsenic distribution in rice.

Conclusions:

  • The Fenton-like reaction mechanism is confirmed as responsible for reduced arsenic uptake by rice.
  • Seasonal and spatial rainfall variations significantly affect arsenic accumulation in rice grains.
  • Findings are crucial for managing arsenic contamination risks in rice production and consumption.