Electrochemical Behaviour and Square Wave Voltammetry of the Rice Herbicides Molinate,Bensulfuron-Methyl,Mefenacet and Thiobencarb |
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| Authors: | E Manuela Garrido Josél Costa Lima Cristina M Delerue-matos Ana Maria Oliveira Brett |
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| Institution: | 1. CEQUP/Departamento de Química-Fisica, Faculdade de Farmdcia , Universidade do Porto , 4050, Porto, Portugal;2. Institute Superior de Engenharia do Porto , 4200, Potto, Portugal;3. CEQUP/Departamento de Química-Fisica, Faculdade de Farmdcia , Universidade do Porto , 4050, Porto, Portugal;4. Departamento de Química, Faculdade de Ciěncias e Tecnologia , Universidade de Coimbra , 3000, Coimbra, Portugal |
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| Abstract: | Abstract Cyclic, differential pulse and square wave voltammetry were applied to develop an electroanalytical procedure for the determination of a group of herbicides used to treat rice crops: molinate, bensul-ruron-methyl, mefenacet and thiobencarb. The oxidation mechanism causes adsorption problems and consequent poisoning of the electrode surface by the products of the electrochemical reaction. Parameters such as pH, frequency and electrochemical electrode surface treatment were optimized. The analytical methodology developed using square wave voltammetry was applied to the determination of molinate and bensulfuron-methyl in simple or mixed commercial products. |
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| Keywords: | Molinate bensulfuron-methyl mefenacet thiobencarb herbicides square wave voltammetry |
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