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Abstract
Humic acid, a soil humic material that occurs widely in soils and waters, can firmly retain or complex certain chlorinated phenoxyacetic and benzoic acids which are widely used as herbicide. The extent of retention depends on the nature of the compound. The latter appeared to be complexed by a mechanism that most likely involves adsorption on large surfaces provided by humic acid in addition to more firmer retention in internal spaces of its structure. The complexing behaviour of humic substances for herbicides should be of interest to those concerned with environmental problems.