. . . "RIV/61989592:15310/01:00001339!RIV/2002/MSM/153102/N" . . "15310" . . . . . . "Electrochemical behavior and voltammetric determination of the herbicide metribuzin at mercury electrodes"@en . "7" . . . . . "SOLID-PHASE EXTRACTION; METAMITRON; REDUCTION; CHROMATOGRAPHY; METABOLITES; ATRAZINE; SOIL"@en . . "Electrochemical behavior and voltammetric determination of the herbicide metribuzin at mercury electrodes" . "5"^^ . . "Fresenius Journal of Analytical Chemistry" . . "The electrochemical behavior of the herbicide metribuzin (4 amino-6-teat-butyl-4,5-dihydro-3-methylthio-1,2,4-triazin-5 one) at mercury electrodes was studied in aqueous solutions by direct current (DC) and tast polarography, differential pulse (DPV) andcyclic voltammetry (CV), and controlled-potential coulometry. The electrolysis products were separated and identified by chromatographic techniques combined with mass spectrometric detection. The reduction process in acid media includes two irreversible steps. In the first four-electron step the N-NH2 and the 1,6-azomethine bonds are reduced. The second step leads to the formation of 5-tert-butyl-2,3,4,5 tetrahydroimidazol-4-one at the mercury-pool electrode. The first reduction step combined with adso rptive accumulation of the herbicide molecule at the mercury electrode surface was used for its determination by differential pulse adsorptive stripping voltammetry (DPAdSV). Calibration curves were linear in the range 1-30 mug L-1 with a detection limit" . . "7"^^ . "5"^^ . "Electrochemical behavior and voltammetric determination of the herbicide metribuzin at mercury electrodes"@en . "DE - Spolkov\u00E1 republika N\u011Bmecko" . "Skopalov\u00E1, Jana" . "Kotou\u010Dek, Milan" . "679085" . "Electrochemical behavior and voltammetric determination of the herbicide metribuzin at mercury electrodes" . "Lemr, Karel" . . "370" . "0"^^ . . "963-969" . "0"^^ . "Bart\u00E1k, Petr" . "RIV/61989592:15310/01:00001339" . "\u010C\u00E1p, Lubom\u00EDr" . . . . . "Z(MSM 153100013)" . "0937-0633" . "[2ADC8530FBE4]" . "The electrochemical behavior of the herbicide metribuzin (4 amino-6-teat-butyl-4,5-dihydro-3-methylthio-1,2,4-triazin-5 one) at mercury electrodes was studied in aqueous solutions by direct current (DC) and tast polarography, differential pulse (DPV) andcyclic voltammetry (CV), and controlled-potential coulometry. The electrolysis products were separated and identified by chromatographic techniques combined with mass spectrometric detection. The reduction process in acid media includes two irreversible steps. In the first four-electron step the N-NH2 and the 1,6-azomethine bonds are reduced. The second step leads to the formation of 5-tert-butyl-2,3,4,5 tetrahydroimidazol-4-one at the mercury-pool electrode. The first reduction step combined with adso rptive accumulation of the herbicide molecule at the mercury electrode surface was used for its determination by differential pulse adsorptive stripping voltammetry (DPAdSV). Calibration curves were linear in the range 1-30 mug L-1 with a detection limit"@en .