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

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%.

Cloud Point Extraction of Pesticide Residues

“…The application of this method greatly enhanced the signal intensity in the chromatogram while reducing the interference of matrix components. Anionic surfactant micelle-mediated extraction (coacervation extraction) has been evaluated for isolation of Etofenprox before HPLC (Jia et al, 2006). The anionic surfactant sodium dodecylsulfonate (SDoS) has been used for extraction of Etofenprox from aqueous environmental samples and from biological samples by means of coacervation extraction.…”

“…Anionic surfactants such as alkyl sulfates, sulfonates, and sulfosuccinates undergo pH-induced coacervation. For extractions with cationic surfactants the main problem arises from the sharp dependence of the volume of the surfactant-rich phase obtained on the volume of the cosurfactant added, which can result in poor reproducibility (Jia et al, 2006). The recoveries obtained from five real samples ranged from 94.3 to 100.1%.…”

A simple HPLC-UVD method for detection of etofenprox in green tea using sample hydration

“…As a systemic insecticide, ETF is absorbed by roots and leaves and transmitted to plant tissues (3). ETF may remain in organisms and the environment for a long time and should be considered a carcinogenic agent, as suggested by US EPA reports (1). ETF induces liver tumor-promoting effects via increased cellular proliferation.…”

“…Etofenprox (2-(4-ethoxyphenyl)-2-methylpropyl-3-phenoxybenzyl ether) (ETF), a synthetic ether pyrethroid insecticide, has been used to control insects, including leafhoppers, bugs, whitefly, aphids, and plant hoppers on paddy rice, fruit, vegetables, and tea (1). ETF is a non-polar compound (log P=7.05, 25 o C) and has an extremely high bio-concentration approximately 10x higher than the value for DDT (2).…”

Highly sensitive quantification of pyrethroid insecticide etofenprox in vegetables with high-performance liquid chromatography and fluorescence detection

“…With regard to analytical methods particularly addressing the insecticide residues, several related papers have been published. Specifically, analytical methods have been proposed mainly for chromatographic techniques such as gas chromatography (GC) coupled with mass spectrometry (MS) [4], and high-performance liquid chromatography (HPLC) coupled with UV or diode array detection (DAD) [5][6][7][8][9], tandem MS [10][11][12], and time-of-flight MS [12]. Immunoassay for the preliminary screening method of the insecticide has also been reported as a non-chromatographic technique [13].…”