Pyrimethanil residues on table grapes Italia after field treatment

J Environ Sci Health B. 2006;41(6):833-41. doi: 10.1080/03601230600805881.

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.

MeSH terms

  • Chromatography, Gas
  • Chromatography, High Pressure Liquid
  • Fungicides, Industrial / analysis*
  • Half-Life
  • Italy
  • Pesticide Residues / analysis*
  • Pyrimidines / analysis*
  • Spectrometry, Mass, Electrospray Ionization
  • Vitis / chemistry*

Substances

  • Fungicides, Industrial
  • Pesticide Residues
  • Pyrimidines
  • pyrimethanil