Application of solid-phase microextraction for the determination of pyrethroid residues in vegetable samples by GC-MS

• Autores: J. Beltran, A. Peruga, E. Pitarch, F. J. Lopez, F. Hernandez
• Localización: Analytical and bioanalytical chemistry, ISSN 1618-2642, Vol. 376, Nº 4, 2003, págs. 502-511
• Idioma: alemán
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• Resumen

  • A solid-phase microextraction (SPME) method has been developed for the determination of 7 pyrethroid insecticides (bifenthrin, lambda-cyhalothrin, permethrin, cyfluthrin, cypermethrin, fenvalerate, and tau-fluvalinate) in water, vegetable (tomato), and fruit (strawberry) samples, based on direct immersion mode and subsequent desorption into the injection port of a GC/MS. The SPME procedure showed linear behavior in the range tested (0.5–50 μg L−1 in water and 0.01–0.1 mg kg−1 in tomato) with r 2 values ranging between 0.97 and 0.99. For water samples limits of detection ranged between 0.1 and 2 μg L−1 with relative standard deviations lower than 20%. Detection limits for tomato samples were between 0.003 and 0.025 mg kg−1 with relative standard deviations around 25%. Finally, the SPME procedure has been applied to vegetable (tomato) and fruit (strawberry) samples obtained from an experimental plot treated with lambda-cyhalothrin, and in both cases the analyte was detected and quantified using a calibration curve prepared using blank matrix. SPME has been shown to be a simple extraction technique which has a number of advantages such as solvent-free extraction, simplicity, and compatibility with chromatographic analytical systems. Difficulties with the correct quantification in a complex matrix are also discussed.