Abstract
It is suggested that: humic acids are polyesters, originate as monomers in the secondary metabolism of both higher and lower plants, and are formed in an acid environment (including high-moor peat); the formation of humic acids is promoted by desiccation, particularly under alkaline conditions; humic acids exhibit keto-enol tautomerism, can form semi-quinones and therefore stable radicals also, and derive their colour from these radicals. (Abstract retrieved from CAB Abstracts by CABI’s permission)
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