Study of the conditions for the determination of metamitron by differential pulse polarography |
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Authors: | J. F. Arranz Valentin A. Goicolea Altuna R. J. Barrio Diez-Caballero A. Arranz Garcia |
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Affiliation: | (1) Department of Analytical Chemistry, Colegio Universitario de Alava, Aptdo. 450, E-01007 Vitoria, Spain |
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Abstract: | Summary The electrochemical behaviour of the herbicide 4-amino-3-methyl-6-phenyl-1,2,4 triazine-5(4H)-on (Metamitron) is studied in aqueous medium using voltammetric techniques, with the ionic strength adjusted to 0.1 mol/l in sodium perchlorate and using a Britton-Robinson buffer. Two reduction waves on the mercury drop electrode appear, at –0.49 V the first and the second folded at –0.95 V and –1.05 V. The system is identified as irreversible and fundamentally controlled by diffusion. Using differential pulse polarography the detection limit reached was 0.02 mg · l–1 for the first wave with an error of less than 2%. Thus a method is proposed for the determination of Metamitron in soil, with a detection limit of up to 0.02 g/g.
Untersuchung der Bedingungen zur Metamitronbestimmung durch Differential-Puls-Polarographie |
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