A Simple and Rapid Extraction for Gas Chromatographic Determination of Thiabendazole and Imazalil Residues in Lemons

Abstract

Um método rápido e eficiente é descrito para a análise de resíduos de tiabendazol e imazalil em limão (casca e polpa). O procedimento é baseado numa extração com hexano:acetato de etila (1:1, v/v) e análise por cromatografia a gás com detector termiônico específico. A possibilidade do efeito de matriz foi investigada. Os valores de recuperação média de 8 análises de amostras de limão fortificadas variaram de 79% a 109%, com valores de desvio padrão relativo entre 2,4% e 12,8%. Os limites de detecção e de quantificação do método foram 0,2 mg kg A rapid and efficient method is described for the determination of thiabendazole and imazalil residues in lemons (peel and pulp). The procedure is based on the extraction with an hexane:ethyl acetate mixture (1:1, v/v) and gas chromatographic analysis using thermionic specific detection (TSD). The possibility of matrix effect was also studied. Mean recoveries from 8 replicates of fortified samples ranged from 79% to 109%, with relative standard deviation values between 2.4% to 12.8%. The detection and quantification limits of the method were 0.2 mg kg

Flow-Injection Determination of Thiabendazole Fungicide in Water Samples Using a Diperiodatocuprate(III)-Sulfuric Acid-Chemiluminescence System

“…These are based on spectrophotometry, [7][8][9] high-performance liquid chromatography (HPLC) and mass spectrometry (MS), [10][11][12][13][14] gas chromatography (GC) with thermionic specific 15 and GC/MS, [16][17][18] capillary electrophoresis with electrospray-MS, 19 micellar electrokinetic chromatography, 20 thin-layer chromatography, 21 polarography, 22 enzyme linked immunosorbent assay, 23 fluorescence, 24 sequential injection analysis with fluorescence, 25 flow injection analysis with fluorescence 26,27 and roomtemperature phosphorescence. 28 In recent years, the developments of new oxidant reagents for the chemiluminescence (CL) reaction based on analytical approaches have been the subject of considerable interest.…”

Analytical methods for the routinely evaluation of pesticide residues in lemon fruits and by products

“…Several analytical methodologies have been developed for the determination of pesticide residues in mandarins, oranges and other citrus fruits [9][10][11][12], but only a few studied systematically lemon as a matrix. Most of these reports cover the analysis of pesticide residues of imazalil, thiabendazole, carbendazim and 2-phenylphenol in lemon fruit [13][14][15][16]. In every case, the complexity of citrus fruits as an analytical matrix for pesticide residue analysis had been pointed out, either using LC-MS or GC-MS determinations [17,18].…”