Pyrimethanil Residues on Table Grapes Italia after Field Treatment |
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Authors: | ALBERTO ANGIONI GIORGIA SARAIS FABRIZIO DEDOLA PIERLUIGI CABONI |
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Affiliation: | 1. Dipartimento di Tossicologia , Università di Cagliari , Cagliari, Italy;2. Centro Regionale Agrario Sperimentale , Cagliari, Italy |
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Abstract: | Residues of the pyrimidine fungicide pyrimethanil [N-(4,6-dimethylpyrimidin-2yl)aniline] were determined in table grapes “Italia” by gas chromatography nitrogen-phosphorus detector (GC-NPD). Pesticides were extracted from grapes with ethyl acetate and hexane solution (1:1 v/v), and were analyzed without any further clean up. Pyrimethanil was confirmed by high-performance liquid chromatography (HPLC) fitted with a diode array detector (DAD) and electrospray ionization mass spectrometry (ESI-MS) in the select ion-monitoring mode (SIM). The residue of pyrimethanil was under the legal limit immediately after treatment, and showed a half-life time, calculated as a reaction of pseudo first order, of 12 days, with a regression coefficient of 0.9954. Recoveries from fortified grapes ranged between 90 and 113% with a maximum coefficient of variation (CV) of 11%. The calculated limits of detection and quantitation for pyrimethanil were 0.005 and 0.01 mg/kg, respectively. |
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Keywords: | Pyrimethanil Table grapes Italia Red grapes Residues Degradation, GC-NPD HPLC-DAD-MS |
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