Microextraction in Packed Sorbent for the Determination of Pesticides in Honey Samples by Gas Chromatography Coupled to Mass Spectrometry

作者：Salami Fernanda H; Queiroz Maria Eugenia C^*

来源：Journal of Chromatographic Science, 2013, 51(10): 899-904.

DOI：10.1093/chromsci/bms187

The present work describes the development and analytical validation of a method involving microextraction packed sorbent and gas chromatography coupled to mass spectrometry (MEPS-GC-MS) for the multi-residue analysis of 22 pesticides (permethrin, fenpropathrin, aldrin, a-hexachlorocyclohexane, beta-hexachlorocyclohexane, lindane, vinclozolin, endosulfan, heptaclor, dodecaclor, tetradifon, 1,1-dichloro-2,2-bis (p-chlorophenyl) ethane, 1,1-bis(p-chlorophenyl)-2,2-dichloroethylen, carbofuran, carbaryl, pirimiphos methyl, chlorpyriphos, dimethoate, disulfoton, fenamiphos, terbufos and profenofos) in honey samples. The MEPS variables of sample pH, draw-eject cycles, ionic strength and desorption procedure were optimized to improve the sensitivity of the proposed method. The method was shown to be linear at concentrations ranging from 2, 5 and 10 ng/g (limit of quantification) to 75-100 ng/g. These values are lower than those established as the maximum residue limits for honey samples. The accuracy values (82-114%) were adequate for all the analytes, as were the inter-day precision data, with coefficient of variation lower than 14%. On the basis of analytical validation, the MEPS-GC methodology has been shown to be a promising alternative for the analysis of pesticides in honey samples. The MEPS packed syringe can be reused 40 times for honey samples, whereas the conventional solid-phase extraction (SPE) column can only be used once. Compared with liquid-liquid extraction and SPE, MEPS is able to reduce sample preparation time and organic solvent consumption.

• 出版日期2013-12