A method has been developed for the determination of thirteen phenylurea herbicide residues in milk. It involves one-step solvent extraction of the milk with methanol by ultrasonication. The extract is cleaned up on an Amberchrom resin cartridge. Reversed-phase, gradient elution, high-performance liquid chromatography with UV detection at 242 nm is used to analyse the residues. The recovery of thirteen phenylurea pesticides is quantitative, ranging from 71.4% to 97.9% for the individual herbicides investigated at concentrations around 0.05 mg kg-1 and from 65.1% to 95.6% around 0.005 mg kg-1. The method is not associated with any of the emulsion problems common to conventional solvent extraction, which considerably reduce the sample clean-up process compared with existing methods.
Rapid method for determination ofphenylurea herbicides inmilk / Lagana', Aldo; Fago, Giovanna; Marino, Aldo; B., Pardo Martinez. - In: CHROMATOGRAPHIA. - ISSN 0009-5893. - STAMPA. - 38:1-2(1994), pp. 88-92. [10.1007/BF02275732]
Rapid method for determination ofphenylurea herbicides inmilk
LAGANA', Aldo;FAGO, Giovanna;MARINO, Aldo;
1994
Abstract
A method has been developed for the determination of thirteen phenylurea herbicide residues in milk. It involves one-step solvent extraction of the milk with methanol by ultrasonication. The extract is cleaned up on an Amberchrom resin cartridge. Reversed-phase, gradient elution, high-performance liquid chromatography with UV detection at 242 nm is used to analyse the residues. The recovery of thirteen phenylurea pesticides is quantitative, ranging from 71.4% to 97.9% for the individual herbicides investigated at concentrations around 0.05 mg kg-1 and from 65.1% to 95.6% around 0.005 mg kg-1. The method is not associated with any of the emulsion problems common to conventional solvent extraction, which considerably reduce the sample clean-up process compared with existing methods.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
