Pyrimethanil residues on table grapes Italia after field treatment

ANGIONI, ALBERTO;SARAIS, GIORGIA;Dedola F;CABONI, PIERLUIGI

2006-01-01

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Abstract

Residues of the pyrimidine fungicide pyrimethanil [ N-( 4,6-dimethylpyrimidin-2-yl) 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.