allomelanins found in soils, coals, and peat, resulting from the decomposition of organic matter, particularly dead plants. they are a mixture of complex macromolecules having polymeric phenolic structures with the ability to chelate metals, especially iron. (merck index, 11th ed) tsca definition 2008: the brown polymeric product from the decomposition of organic matter, particularly dead plants. this combination of polymers may contain aromatic and heterocyclic structures, carboxy groups, and nitrogen.
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