The S. W. Polarographic Determination of Disulfide, Mercaptan and Free Sulfur in Petroleum Naphtha
- 1 January 1967
- journal article
- Published by Oxford University Press (OUP) in Bulletin of the Chemical Society of Japan
- Vol. 40 (1) , 97-101
- https://doi.org/10.1246/bcsj.40.97
Abstract
The application of square-wave polarography to the determination of small amounts of disulfide, mercaptan and free sulfur in a mixed solution of methanol, glacial acetic acid, and sodium acetate was studied. Disulfide, mercaptan, and free sulfur in concentrations below 10 ppm were easily determined in these mixed solvents. The derivative wave heights were proportional to the concentrations predicted by the theory of s. w. polarography. The effects of changes in solvent and in supporting electrolyte concentration, dissolved oxygen, and temperature were discussed. It was determined that concentrations of 2 vol% glacial acetic acid and 1.4 m sodium acetate were necessary to obtain a constant peak height. The temperature coefficients of disulfide, mercaptan and free sulfur were about 4.5 (first wave), 0.7 and 4.5% per degree respectively in the neighborhood of 25°C. The effect of the dissolved oxygen was removed by passing nitrogen through for 5 min.This publication has 4 references indexed in Scilit:
- The Spectrophotometric Determination of Thiophene in Petroleum Naphtha with α-Nitroso-β-naphtholBulletin of the Chemical Society of Japan, 1966
- S.W. Polarographic Determination of Mercaptan Compounds and Free Sulfur in Petroleum NaphthaReview of Polarography, 1965
- The Quantitative Determinations of High-boiling Divalent Organo Sulfur Compounds by Copper —Determinations of Divalent Sulfur Compounds Formed in the Reaction between Benzene and Sulfur—Bulletin of the Chemical Society of Japan, 1963
- Removal of Elemental Sulfur from Hydrocarbon FractionsAnalytical Chemistry, 1957