Changes in the Forms of Metal Occurrence during Photochemical Oxidation of Organo-Mineral Compounds in Swamp and River Waters

The interaction of organic matter with metal ions plays a key role in the migration of metals in aquatic ecosystems, the formation of natural water quality and toxicity, and the bioavailability of metals. Sunlight irradiation of swamp and river waters transforms dissolved organic matter, degrading i...

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Bibliographic Details
Published in:Moscow University geology bulletin 2022-10, Vol.77 (5), p.605-611
Main Authors: Aleshina, A. R., Drozdova, O. Yu, Lapitskiy, S. A.
Format: Article
Language:English
Subjects:
Aquatic ecosystems
Bioavailability
Dissolved organic matter
Earth and Environmental Science
Earth Sciences
Geology
Heavy metals
Hydroxides
Iron
Irradiation
Ligands
Manganese
Metals
Mineralization
Molecular weight
Oxidation
Photochemicals
Photochemistry
Rivers
Swamps
Toxicity
Water pollution
Water quality
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Summary:The interaction of organic matter with metal ions plays a key role in the migration of metals in aquatic ecosystems, the formation of natural water quality and toxicity, and the bioavailability of metals. Sunlight irradiation of swamp and river waters transforms dissolved organic matter, degrading it to low-molecular-weight compounds up to mineralization and simultaneously coagulating compounds of more than 0.22 μm. As a result of the changes in the oxidation state of Fe and its bonds with organic matter the formation of Fe(III) hydroxides occurs. These hydroxides can form large organo-mineral compounds of more than 0.22 μm stabilized by organic ligands, with which Mn, Co, and Cd can coprecipitate.
ISSN:0145-8752
1934-8436
DOI:10.3103/S0145875222050040