Effects of Routine Aquaculture Management on Elimination Rule of Fenvalerate and Its Cis-trans Isomers

doi:10.11924/j.issn.1000-6850.casb18060066

Abstract

Abstract: Fenvalerate (FV), as a highly toxic pesticide for aquatic organisms, will endanger the safety of cultured organisms in the aquaculture environment. In this study, sodium percarbonate and sodium hypochlorite were selected as added drugs, and the effects of added drugs on the elimination rule of FV in aquaculture routine management activities were explored. The detection results of the gas chromatograph were used to analyze the elimination rule of FV under the condition of different addition levels of the two drugs. The results showed that the addition of 30 mg/L sodium percarbonate and 40 mg/L sodium hypochlorite had a significant effect on the elimination of FV and its cis-trans isomers (trans isomer FV1 and cis-isomer FV2), and the half-life of FV elimination ranged from 2.87 to 10.85 d, the FV1 were 2.88 d ~ 12.55 d, the FV2 were 2.83 d ~ 9.56 d. Through the mean distribution of the corresponding indicators and correlation analysis, it was found that the elimination of FV is related to the impact of high concentrations of sodium percarbonate and sodium hypochlorite on the pH of the water. Sodium percarbonate mainly eliminates the residual FV in water by increasing the pH of the water and its own oxidation. Sodium hypochlorite is mainly used to hydrolyze FV in aquaculture water by increasing the pH of the water. In actual production, high concentrations of sodium percarbonate and sodium hypochlorite can be used to eliminate residues of FV in the aquaculture water, but the appropriate level of addition should be determined according to the culture object and the environmental conditions of the water body. In terms of the elimination of FV, the addition of the two types of drugs did not bring about a significant difference in the elimination of the cis-trans isomers of FV, and the factors influencing the elimination of the cis-trans isomers of FV remained to be further clarified. This study clarified the promotion of routine management activities of aquaculture on the elimination of FV and provided theoretical guidance for the safe use and elimination of FV in aquaculture environment.

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