Resumo

NOORI, Arezoo Hassan; REZAEE, Mohammad; KAZEMIPOUR, Maryam  e  MASHAYEKHI, Hossein Ali. Simultaneous determination of permethrin and deltamethrin in water samples by magnetic solid-phase extraction coupled with dispersive liquid-liquid microextraction combined with gas chromatography. S.Afr.j.chem. (Online) [online]. 2017, vol.70, pp.200-208. ISSN 1996-840X.  http://dx.doi.org/10.17159/0379-4350/2017/v70a27.

In this study, new and efficient method, magnetic solid phase extraction coupled with dispersive liquid-liquid microextracton (MSPE-DLLME) combined with gas chromatography-flame ionization detector (GC-FID) was developed for the preconcentration and determination of permethrin and deltamethrin in water samples. Several factors influencing the extraction efficiency including amount of sorbent, sorption time, type of extraction solvent and its volume, type of disperser solvent and its volume and elution time were investigated and optimized. Using optimum extraction conditions, dynamic linear range of 0.5-100 L^-1 for both, limits of quantification (LOQs) of 0.6 L^-1 for both and limits of detection (LODs) of 0.01 L^-1 for both were obtained. Finally, the method was successfully applied for the extraction and determination of permethrin and deltamethrin in water samples in the range of micrograms per litre with RSDs < 4 %.

Palavras-chave : Magnetic solid-phase extraction; dispersive liquid-liquid microextraction; permethrin; deltamethrin; gas chromatography; water samples.

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