John Wiley & Sons, Ltd.

Enantioselective toxicity and degradation of the chiral insecticide fipronil in Scenedesmus obliguus suspension system

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Fipronil is an effective insecticide, but it present high toxic effect to non‐target aquatic organisms. The enantioselective toxicity and degradation of fipronil enantiomers in the freshwater algae Scenedesmus obliguus suspension were studied in the present study. There was great difference in the acute toxicity of the enantiomers to Scenedesmus obliguus with 72 h median effective concentration (EC50) of 0.29 and 1.50 mg L−1 for the R‐ and S‐fipronil, respectively. The influences on the concentration of chlorophyll a, chlorophyll b and carotenoids were determined and the effects of fipronil on the concentration of chlorophyll a and b were also enantioselective. The degradation of fipronil in algae suspension was enantioselective with half‐lives for R‐ and S‐fipronil of 2.9 d and 3.2 d, respectively, with the enantiomer fraction (EF) reaching 0.65 at the 17th day. The enantiomeric differences should be taken into consideration for fipronil risk assessment. Environ Toxicol Chem © 2014 SETAC

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