Electrochemical behavior of metribuzin on a glassy carbon electrode in an aqueous medium including quantitative studies by anodic stripping voltammetry

Journal of the Brazilian Chemical Society

Tonholo, Josealdo¹  Abreu, Fabiane Caxico de¹  Goulart, Marília Oliveira Fonseca¹  Silva, Emanuella Gomes da¹  Silva, Tiago Terto da¹  Lima, Augusto César de Andrade¹  Universidade Federal de Alagoas, Maceió, Brazil¹ 

关键词: metribuzin;    herbicide;    anodic stripping voltammetry;    electro-Fenton;   

DOI  :  10.1590/S0103-50532009000900019

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

The electrochemical behavior of the herbicide metribuzin was studied in an aqueous solution on glassy carbon, carbon paste/Nujol oil and carbon paste/castor oil using cyclic voltammetry, square-wave voltammetry, differential pulse voltammetry, controlled-potential coulometry and electrolysis, for quantification and decontamination purposes. The main electrolytic products obtained from the reduction of metribuzin, after consumption of 8.26 mol electron mol-1, were deaminometribuzin and diketometribuzin. The anodic wave observed after electroreduction is associated with the oxidation of the methylthiolate generated in the electrolytic process. This wave was used to quantitatively determine metribuzin in a commercial sample by anodic stripping voltammetry. The electro-Fenton method was employed to promote decontamination by eliminating the herbicide, resulting in 80% of mineralization of the metribuzin.

【 授权许可】

Unknown