Potentiometric Determinations of H-Ion Concentration in Hydrocarbon Oils

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Abstract
The paper discusses potentiometric measurements of hydrogen ion concentration carried out in hydrocarbon oils that have attained high electrical conductivity (a) through oxidation in the laboratory, (b) through deterioration in service, (c) through addition of certain compounds. The e.m.f. data are interpreted by comparing them with those obtained from lauryl sulfonic acid solutions in oil. The results indicate that the hydrogen ion concentration in the three types of oils is too low to account for the total observed electrical conductivity. It is obvious, then, that the predominant mechanism of ion generation is different from the usual acidic dissociation. A bimolecular reaction leading to two organic ions is suggested on the basis of evidence from organic chemistry and a quantitative relation that follows from conductivity data presented in this paper.

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