Determination of sulfur compounds in gasoline using mercury film electrode by square wave voltammetry

Electrochemical determination of elemental sulfur in Brazilian naphtha: method and validation

“…The detection limit was found to be 0.5 mg L -1 . Therefore, the proposed method has a detection limit smaller than that used by Kashik et al However, works by Sid Kalal et al [27] and Serafim and Stradiotto [28] reported detections limits of 0.0001 mg L -1 and 0.0008 mg L -1 , respectively, which are lower than that obtained by the proposed method. Although their studies employ different techniques and working electrodes, their methodologies were those that reported the smallest DL up to now.…”

“…Voltammetry in the petroleum industry was initially used in the analysis of sulfur and its compounds, naphthalene and its derivatives, hydroperoxides, antioxidants and trace metals [17]. Table 1 shows some voltammetric applications for elemental sulfur determination in petroleum and its derivatives [18][19][20][21][22][23][24][25][26][27][28]. Elemental sulfur has been studied for many decades [17], and few changes have been observed from one methodology to another.…”

Electrochemical Behavior of a Glassy Carbon Electrode Chemically Modified with Nickel Pentacyanonitrosylferrate in Presence of Sulfur Compounds

“…Serafim and Stradiotto [30] developed a sensitive method based on square wave voltammetry for the quantitative determination of elemental sulfur, disulfide and mercaptan in gasoline using a mercury film electrode of 4.3 mm thickness by direct dissolution of gasoline in a solution of 1.4 mol L À1 sodium acetate and 2 % acetic acid in methanol. Voltammetric measurements were obtained for a mercury film, using a potential of À0.9 V and 600 s time of deposition, by square wave voltammetry with detection limits of the 3.0 10 À9 , 1.6 10 À7 and 4.9 10 À7 mol L À1 for elemental sulfur, disulfide and mercaptan, respectively.…”

Voltammetry: A Brief Review About Concepts

“…Dentro deste âmbito, as técnicas voltamétricas se apresentam como uma boa alternativa para muitas aplicações em química analítica, seja no controle de qualidade de produtos farmacêuticos, [4][5][6][7][8][9][10][11][12][13] controle de qualidade de produtos alimentícios, [14][15][16][17][18] estudos ambientais, [19][20][21] análise de combustíveis entre outras. [22][23][24][25][26][27] Suas vantagens se baseiam principalmente na alta sensibilidade, baixo custo instrumental e operacional, embora encontre certa resistência a um maior uso por parte dos analistas, o que pode estar relacionado ao fato de sua teoria básica ser o side ada difí il e a a ge te.…”