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Development of an Analytical Methodology for Quantification of Strong Acid in Diesel Oil
Author(s) -
de Souza Flávia C.,
da Rocha Janaina C.,
Vieira Eduardo,
Machado Sergio A. S.,
D'Elia Eliane
Publication year - 2009
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200900143
Subject(s) - sulfonic acid , chemistry , aqueous solution , extraction (chemistry) , diesel fuel , organosulfur compounds , toluene , degradation (telecommunications) , chloride , detection limit , chromatography , organic chemistry , sulfur , telecommunications , computer science
Many factors can affect the quality of diesel oil, in particular the degradation processes that are directly related to some organosulfur compounds. During the degradation process, these compounds are oxidized into their corresponding sulfonic acids, generating a strong acid content during the process. p ‐Toluene sulfonic acid analysis was performed using the linear sweep voltammetry technique with a platinum ultramicroelectrode in aqueous solution containing 3 mol L −1 potassium chloride. An extraction step was introduced prior to the voltammetric detection in order to avoid the adsorption of organic molecules, which inhibit the electrochemical response. The extraction step promoted the transference of sulfonic acid from the diesel oil to an aqueous phase. The method was accurate and reproducible, with detection and quantification limits of 5 ppm and 15 ppm, respectively. Recovery of sulfonic acid was around 90%.