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Abstract
The feasibility of using fluorescence quenching studies as a model for environmental dynamics was explored in a sand-water-macrophyte experimental system. The influence of humic acid (HA) on the release of gamma-HCH from sand into water and the macrophyte lemna was studied by fluorescence in the presence and absence of a detergent, linear alkylbenzenesulphonate (LAS). Gamma-HCH was found to enhance the fluorescence of humic acid whereas it quenched the fluorescence of chlorophyll. LAS showed an additive effect through solubilization. The consequences of HCH-humic interaction in relation to detoxification/potentiation effects in ecosystems are discussed.