Determination of total sulphur in naphthas

Abstract

The determination of total sulphur in naphthas and other volatile hydrocarbons is reported. The method developed involves the combustion of the sample in oxygen and conductimetric high-frequency micro-titration of the sulphate ions in the absorbing solution of hydrogen peroxide with standardised barium perchlorate solution. An aliquot is prepared by controlled evaporation to dryness (∼0.5 ml) and then diluted with ethanol-water mixture (3 + 2). The method has been established for samples containing 0.4–50 p.p.m. m/m of sulphur. Results for precision determinations are given.