title: Study of the electro-adsorptive behaviour of the herbicide nitralin by means of voltammetric techniques.
abstract: The electroanalytical behaviour of the herbicide Nitralin has been studied by means of different voltammetric techniques. Nitralin is adsorbed on the mercury electrode and gives 2 reduction waves at -0.6 and -0.7 V versus Ag AgCl reference electrode, for pH values > 10. The electrochemical process is irreversible and strongly influenced by pH solution. A systematic study of the several instrumental and accumulation variables affecting the stripping response was carried out using square wave (SWV; Osteryoung's method) and differential pulse voltammetry (DPV) as redissolution techniques. The limits of detection were 4.4 x 10(-1) mol 1(-1) (AdS-SWV) and 3.5 x 10(-11) mol 1(-1) (AdS-DPV), with variation coefficients of 4.17 and 3.90% respectively, at a concentration level of 8 x 10(-9) mol 1(-1) (n = 10). A method, based on AdS-DPV, for the determination of Nitralin in ground-water is proposed. A detection limit of 8.7 x 10(-11) mol 1(-1) (AdS-DPV) was reached in real samples.
authors.affiliation: Departamento de Química Analítica, Facultad de Farmacia, Universidad del País Vasco, Apdo. 450. D.P. 01080. Vitoria, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Arranz
authors.forename: S F
authors.initials: SF
authors.lastname: de Betoño
authors.forename: J M
authors.initials: JM
authors.lastname: Moreda
authors.forename: J F
authors.initials: JF
authors.lastname: Arranz