"[3880CF0F0ACC]" . "Electrochemical behaviour of Norflurazon at mercury electrodes, and its analytical applications" . . . "11"^^ . . "0232-0061" . "Norflurazon (systemic herbicide) is reducible at mercury electrodes to the different extent depending on media acidity, area of mercury cathode and its contact time with an electrode surface. The electrode reaction, investigated using direct current and pulse voltammetry, controlled-potential coulometry, and HPLC-MS, is a combination of the electro-reduction and a kinetic process. Four-electron (by voltammetry) or six- electron (by coulometry) irreversible reduction of a norflurazon protonized form was observed in strongly acid media. Simple compounds (HCl, NH3) are released and five- membered pyrrole cycle is formed at electroconversion in these types of media. Only two-electron reduction proceeds in weakly acid solutions and no signal is observed in neutral pH values. A new diffusion wave strongly affected by kinetics is formed in alkaline media. Norflurazon was determined in 0.01 M HCl using differential pulse voltammetry and adsorptive stripping voltammetry with limits of detection 43 nmol.L-1 (13" . "Lemr, Karel" . . "1" . "RIV/61989592:15310/07:00005777" . . . "Electrochemical behaviour of Norflurazon at mercury electrodes, and its analytical applications" . . "S, Z(MSM6198959216)" . . "47" . . "Acta Universitatis Palackianae Olomucensis, Facultas Rerum Naturalium, Chemica" . . "Kotou\u010Dek, Milan" . "Zimpl, Milan" . "3"^^ . "15310" . . . . "Skopalov\u00E1, Jana" . . . "CZ - \u010Cesk\u00E1 republika" . "herbicide; norflurazon; mercury electrodes; coulometry; voltammetry"@en . "Norflurazon (systemic herbicide) is reducible at mercury electrodes to the different extent depending on media acidity, area of mercury cathode and its contact time with an electrode surface. The electrode reaction, investigated using direct current and pulse voltammetry, controlled-potential coulometry, and HPLC-MS, is a combination of the electro-reduction and a kinetic process. Four-electron (by voltammetry) or six- electron (by coulometry) irreversible reduction of a norflurazon protonized form was observed in strongly acid media. Simple compounds (HCl, NH3) are released and five- membered pyrrole cycle is formed at electroconversion in these types of media. Only two-electron reduction proceeds in weakly acid solutions and no signal is observed in neutral pH values. A new diffusion wave strongly affected by kinetics is formed in alkaline media. Norflurazon was determined in 0.01 M HCl using differential pulse voltammetry and adsorptive stripping voltammetry with limits of detection 43 nmol.L-1 (13"@en . "4"^^ . . "RIV/61989592:15310/07:00005777!RIV10-MSM-15310___" . . "419695" . . . . "Electrochemical behaviour of Norflurazon at mercury electrodes, and its analytical applications"@en . "Electrochemical behaviour of Norflurazon at mercury electrodes, and its analytical applications"@en .