Rainwater-Derived Reactive Oxygen Species Diminish Environmental Risk from Arsenic in Paddy Rice Systems DOI

Kaiqing Fan,

Chuxia Lin,

Langlang Li

et al.

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: March 18, 2025

It has been previously observed that rainwater input into paddy rice soils reduced the level of grain-borne arsenic, and it is hypothesized a Fenton-like reaction triggered by interaction between rainwater-borne hydrogen peroxide ferrous iron in responsible for microbially mediated impediment As uptake plants. However, this hypothesis remains untested. This study tested through mesocosm experiments, confirming hydroxyl radical (•OH) generation, elevating soil redox potential, oxidizing arsenite to less phytoavailable arsenate porewater, thereby reducing accumulation grain. Comparison two crops cultivation with different fluxes confirms seasonal rainfall variation an impact on receiving more having lower arsenic concentration grain compared rainfall. Using China's major rice-producing region as example, demonstrated spatial regime could geographical distribution at national scale. The findings have implications assessment management environmental risk from arsenic-contaminated grains.

Language: Английский

Rainwater-Derived Reactive Oxygen Species Diminish Environmental Risk from Arsenic in Paddy Rice Systems DOI

Kaiqing Fan,

Chuxia Lin,

Langlang Li

et al.

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: March 18, 2025

It has been previously observed that rainwater input into paddy rice soils reduced the level of grain-borne arsenic, and it is hypothesized a Fenton-like reaction triggered by interaction between rainwater-borne hydrogen peroxide ferrous iron in responsible for microbially mediated impediment As uptake plants. However, this hypothesis remains untested. This study tested through mesocosm experiments, confirming hydroxyl radical (•OH) generation, elevating soil redox potential, oxidizing arsenite to less phytoavailable arsenate porewater, thereby reducing accumulation grain. Comparison two crops cultivation with different fluxes confirms seasonal rainfall variation an impact on receiving more having lower arsenic concentration grain compared rainfall. Using China's major rice-producing region as example, demonstrated spatial regime could geographical distribution at national scale. The findings have implications assessment management environmental risk from arsenic-contaminated grains.

Language: Английский

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