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How redox condition can release metal bound to organic matter?

Dissolved organic carbon

Soil contamination

Oxidation state

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Redox conditions can release metals bound to organic matter through various mechanisms. One mechanism involves the reduction of metal oxides or hydroxides by organic matter fractions containing hydroquinone and ketone functional groups ^[Gu et al.]. These functional groups have the ability to directly reduce metals or metal oxides, resulting in the release of metal ions into the aqueous medium ^[Gu et al.]. Additionally, under reductive conditions, the dissolution of Fe oxyhydroxides can occur, which leads to the release of metals that were adsorbed or coprecipitated with the oxyhydroxides ^[Davranche et al.]. The release of metals from organic matter can also be influenced by the complexation and redox properties of dissolved organic matter (DOM) ^[Li and Gong]. DOM can complex with heavy metals and drive their release through coprecipitation and complexation processes ^[Li and Gong]. Overall, redox conditions can promote the release of metals bound to organic matter through various mechanisms, including direct reduction and dissolution of metal-containing phases.

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Open access•Journal Article•DOI Effects of Dissolved Organic Matter on the Bioavailability of Heavy Metals During Microbial Dissimilatory Iron Reduction: A Review. Yuanhang Li, Xiaofeng Gong - Show less +1 more 13 May 2021-Reviews of Environmental Contamination and Toxicology 12 Citations	The redox condition during microbial dissimilatory iron reduction can cause the release of metals bound to organic matter.
Open access•Journal Article•DOI Complexation and Redox Buffering of Iron(II) by Dissolved Organic Matter. Ellen E. Daugherty, Benjamin Gilbert, Peter S. Nico, Thomas Borch - Show less +3 more 18 Sep 2017-Environmental Science & Technology 137 Citations	Redox conditions can release metal bound to organic matter through oxidation reactions, such as the Fenton-like reaction with H2O2.

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