On the toxic effects of tetraethyl lead and its derivatives on the chrysophyte Poterioochromonas malhamensis. III. Chemical analyses

The photolytic decomposition of tetraethyl lead (TEL) into the derivatives triethyl lead (TriEL), diethyl lead (DiEL), and into inorganic lead in an aqueous environment was examined by using a single-step dithizone extraction method. The results of the experiments conclusively indicated that TriEL is the toxic derivative of TEL which is created upon illumination and causes severe inhibitory effects in cultures of Poterioochromonas malhamensis poisoned by TEL. The significance of these findings for polluted natural environments and for the metabolic pathway of organolead in intoxicated mammalia is discussed briefly, and a diagrammatical model is presented describing the presumed fate of TEL and its derivatives under experimental conditions. (JMT)

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