GAS-CHROMATOGRAPHIC DETERMINATION OF BENALAXYL RESIDUES IN DIFFERENT CROPS AND WATER

A gas chromatographic method is described that is suitable for the det ermination of benalaxyl residues ranging from 10 to 0.1 mug/kg in seve ral crops, must, wine, and water. The compound is extracted with aceto ne and purified either by partitioning between water and n-hexane or b y passing the extract through an Extrelut column with n-hexane. Furthe r purification is achieved by column chromatography on alumina. The ac tive ingredient is finally determined by gas chromatography with nitro gen-phosphorus detection. Mean recoveries were greater-than-or-equal 9 5% in the various crops tested and in the 0.01-1.05 mg/kg fortificatio n range. Standard deviations for each crop were less-than-or-equal-to 6.5%.