Application of matrix solid-phase dispersion to the determination of a new generation of fungicides in fruits and vegetables.
A method based on matrix solid-phase dispersion (MSPD) and gas chromatography to determine eight fungicides in fruits and vegetables is described. Fungicide residues were identified and quantified using nitrogen-phosphorus detection and electron-capture detection connected in parallel and confirmed by mass spectrometric detection. The method required 0.5 g of sample, C18 bonded silica as dispersant sorbent, silica as clean-up sorbent and ethyl acetate as eluting solvent. Recoveries from spiked orange, apple, tomato, artichoke, carrot and courgette samples ranged from 62 to 102% and relative standard deviations were less than 15% in the concentration range 0.05-10 mg kg(-1). Detection and quantitation limits ranged 3-30 microg kg(-1) and 10-100 microg kg(-1), respectively, with linear calibration curves up to 10 mg kg(-1). The analytical characteristics of MSPD compared very favourably with the results of a classical multiresidue method, which uses ethyl acetate and anhydrous sodium sulphate for the extraction.
Navarro
M
M
Laboratori de Bromatologia i Toxicologia, Facultat de Farmàcia, Universitat de València, Burjassot, Spain.
Picó
Y
Y
Marín
R
R
Mañes
J
J
D002849:Chromatography, Gas / Q000379:methods; D005638:Fruit / Q000737:chemistry*; D005659:Fungicides, Industrial / Q000032:analysis*; D012015:Reference Standards; D012680:Sensitivity and Specificity; D014675:Vegetables / Q000737:chemistry*
D005659:Fungicides, Industrial