Electroanalytical studies of sulfentrazone in protic medium, its degradation by the electro-Fenton process, and toxicity assessment using ss-DNA.
Sulfentrazone is an herbicide used as a pre-plant incorporated or pre-emergence treatment. The electrochemical oxidation of sulfentrazone was studied, by cyclic, differential and square-wave voltammetry on unmodified and on glassy carbon nanotube-modified electrodes, and by controlled-potential coulometry and electrolysis. The voltammograms of sulfentrazone showed a main irreversible diffusion-controlled pH-dependent oxidation peak. The in situ DNA-damaging capacity of sulfentrazone was also investigated, employing double stranded ds-DNA-modified glassy carbon electrode, without evidence of interaction. On the other hand, in a solution of sulfentrazone and single stranded ss-DNA, the oxidation signals of the respective bases decreased concentration-dependently, indicating binding of sulfentrazone to guanine and adenine. The electro-Fenton method was employed to promote decontamination by eliminating the herbicide, resulting in almost 60% of mineralization.
de A Lima
Augusto C
AC
Instituto de Química e Biotecnologia, Universidade Federal de Alagoas, Campus A.C. Simões, Tabuleiro do Martins, 57072-970 Maceió, AL, Brazil.
dos S Melo
Acácia M
AM
Pires
Edjane Vieira
EV
dos Santos Ferreira
Roberta Costa
RC
Sant'Ana
Antônio E G
AE
Goulart
Marília O F
MO
de Abreu
Fabiane C
FC
D053904:DNA Breaks, Single-Stranded; D004277:DNA, Single-Stranded / Q000737:chemistry / Q000187:drug effects*; D004572:Electrolysis; D006540:Herbicides / Q000737:chemistry* / Q000633:toxicity; D006861:Hydrogen Peroxide / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D013449:Sulfonamides / Q000737:chemistry* / Q000633:toxicity; D018675:Toxicity Tests / Q000379:methods; D014230:Triazoles / Q000737:chemistry* / Q000633:toxicity
D004277:DNA, Single-Stranded; C045076:Fenton's reagent; D006540:Herbicides; D013449:Sulfonamides; D014230:Triazoles; C475571:N-(2,4-dichloro-5-(4-(difluoromethyl)-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl)phenyl)methanesulfonamide; D006861:Hydrogen Peroxide; D007501:Iron