Metodologia Para Detecção Eletroquímica Qualitativa De Compostos Orgânicos Em Interfaces Petróleo/Água

Abstract

publicado na web em 22/10/2018 METHODOLOGY TO PROMOTE THE QUALITATIVE DETECTION OF ORGANIC COMPOUNDS IN PETROLEUM/WATER INTERFACES.The possibility of detecting some organic compounds directly in a petroleum/water interface was described. Aqueous phase was composed by 1 x 10 -3 mol L -1 NaCl solution and the oil phase was carried out using crude oil forming an oil/water interface. Carbon based screen-printed electrodes was used in conjunction with square-wave voltammetry technique, constituting the main tools of this technical note. Petroleum was contaminated with phenol, naphthalene and cyclohexane. The oxidation potentials for these three molecules were 0,72, 0,81 and 0,87 V vs. Ag, respectively. Phenol was chosen to study the stability of currents during the process. After 15 minutes, the currents of this process were stable. Although the formation of a passivation film, the qualitative detection of the molecules was possible. Finally, the main advantage of this methodology is the possibility of detecting contaminants in oil without the necessity of complicated pre-treatment steps.

CONVERSÃO ELETROQUÍMICA DE NANOPARTÍCULAS DE δ-FeOOH EM NANOPARTÍCULAS DE AZUL DA PRÚSSIA SOBRE ELETRODOS IMPRESSOS DE CARBONO MODIFICADOS COM GRAFENO

“…Nessa estrutura tem-se a presença de um contra eletrodo e um eletrodo de trabalho compostos por carbono e de um eletrodo de pseudo-referência composto por prata metálica. Esse tipo de célula tem sido muito utilizado nos últimos anos devido ao seu baixo custo de produção e a redução de reagentes e amostras utilizados (SILVA et al, 2019).…”