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A rapid reversed‐phase high‐performance liquid chromatographic method, with fluorimetric detection, is described for routine analysis of sulfathiazole (STZ) residues in honey. Samples were dissolved in 1 M hydrochloric acid and submitted to pre‐column derivatization with fluorescamine. Liquid chromatographic analysis of the fluorescent derivative is performed on a C18 column using a mobile phase of 2% acetic acid/ acetonitrile (60:40, v/v). The quantification limit obtained for STZ in honey was 10 µg/kg.

The determination of iprodione, vinclozolin, and cymoxanil fungicide residues in raspberries and lettuce has been carried out by HPLC with an UV detector, by HPTLC with an densitometric detection, and by GC with an electron capture detector (ECD). In all cases, fungicide residues were extracted with acetone and liquid-liquid partitioning process and finally purified on silica gel. Recoveries are always higher than 70%. For iprodione, vinclozolin, and cymoxanil, respectively, the limits of detection were 0.01 ppm, 0.013 ppm, and 0.08 ppm for the HPLC method, 0.2 ppm, 0.43 ppm, and 0.5 ppm for the HPTLC method, and 0.025 ppm, 0.004 ppm, and 0.03 ppm for the GC method.