Quantitative gas-chromatographische Bestimmung des Wirkstoffrückstandes auf Weintrauben,in Traubenmost und in Wein nach Anwendung von Ortho-Phaltan

A quantitative gas-chromatographic method for the determination of the fungicide Ortho-Phaltan (N-trichloromethylthiophthalimide) on grapes, in must and wine is described. The residues are extracted with chloroform and after purification on a silica-gel column analysed by electron-capture gas-chromatography. The method is sensitive to 0,1 ppm. The average recovery of residues was 94% on grapes, 84% in must and 85% in wine.