| Autor: |
Han, Qu, Rui-Xue, Ma, Dong-Hui, Liu, Peng, Wang, Le-Dan, Huang, Xing-Xu, Qiu, Zhi-Qiang, Zhou |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
Environmental toxicology and chemistry. 33(11) |
| ISSN: |
1552-8618 |
| Popis: |
Fipronil is an effective insecticide, but it presents highly toxic effects in nontarget aquatic organisms. The present study examined the enantioselective toxicity and degradation of fipronil enantiomers in a freshwater algae Scenedesmus obliguus suspension. There was a substantial difference in the acute toxicity of the enantiomers to S. obliguus, with 72-h median effective concentrations (EC50s) of 0.29 mg L(-1) and 1.50 mg L(-1) for the R-fipronil 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 chlorophyll b were also enantioselective. The degradation of fipronil in algae suspension was enantioselective, with half-lives for R-fipronil and S-fipronil of 2.9 d and 3.2 d, respectively, and the enantiomer fraction reaching 0.65 at the day 17. The enantiomeric differences should be taken into consideration for fipronil risk assessment. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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