Determination of fosetyl-aluminium in the presence of folpet Milinovic, J.; Lazarev, S.; Stojanovic, D. Pesticides and Phytomedicine 2006 v. 21(2) p. 161-165
A modified spectrophotometric method for determination of fosetyl-aluminium in the presence of folper was developed. The method is based on melting samples in heating furnace at a temperature of 800-900 deg C. The residues obtained were oxidized, and phosphonate from fosetyl-aluminium was converted into phosphate by adding solutions of nitric acid and hydrogen peroxide. Phosphate was determined spectrophotometrically at 440 nm with the molibdate-vanadate reagent. Based on phosphate content (as P2O5), fosetyl-aliminium content can be determined, taking into account that three moles of P2O5 are obtained from two moles of fosetyl-aluminium. Based on the values of relative standard deviation and recovery, it may be concluded that the proposed method is relatively reproducible and accurate.
Potential of liquid chromatography-atmospheric pressure chemical ionisation tandem mass spectrometry for determination of fosetyl-aluminium residues in dried hops. Poustka, J., Hajšlová, J., Holadová, K., Nováková, K. Czech Journal of Food Sciences, 2004 (Vol. 22) (No. 1) 24-28 Abstract: New analytical procedure for the determination of fosetyl-aluminium in hop cones (also called "hops") was developed. Liquid chromatography-atmospheric pressure chemical ionization tandem mass spectrometry (LC-APCI-MS/MS) allowed a highly selective determination of this fungicide which facilitated the sample preparation. The sufficiently low detection limit (1 mg/kg of dried hops) with the acceptable method performance characteristics (RSD 9%, recovery 76% - at the level of 10 mg/kg) complies with the need to inspect the observance of maximal residual limit of 100 mg/kg. The application of LC-MS technique thus provided an effective way of fosetyl-aluminium determination in the complex hops matrix.