Analytical and Bioanalytical Chemistry 2006-03-01

Determination of Etofenprox in environmental samples by HPLC after anionic surfactant micelle-mediated extraction (coacervation extraction).

Guifang Jia, Chenglu Bi, Qiuxia Wang, Jing Qiu, Wenjing Zhou, Zhiqiang Zhou

Index: Anal. Bioanal. Chem 384(6) , 1423-7, (2006)

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Abstract

A method is described for determination of residues of the insecticide Etofenprox in environmental samples. Anionic surfactant micelle-mediated extraction (coacervation extraction) was evaluated for isolation of Etofenprox before HPLC. The optimum conditions used for extraction included: 0.09 g sodium dodecanesulfonate (SDoS), 3.1 mL (3.3, for concentrations below 0.04 mg L(-1)) 12 mol L(-1) HCl, 5 min vortex stirring, 5 min centrifugation at 4000 rpm, 2 h equilibration time. The limits of quantification (LOQ) and detection (LOD) were 0.01 and 0.004 mg L(-1), respectively, and recoveries obtained from five real samples ranged from 94.33+/-2.48 to 100.13+/-2.71%. The precision of the method was good; relative standard deviations (RSD) were less than 7%.