Abstract
A method for the determination of trace total sulfur in petroleum distillates is described. The petroleum sample is combusted using an oxyhydrogen burner. The combustion products are collected in 50 ml of absorber solution containing 10 mg of sodium nitrite and 0.444 mg of sodium sulfate. The excess nitrite is destroyed by boiling. After cooling, sufficient 1,4-dioxane is added to make a 50 volume % solution for the titration. The titration is carried out using −0.5μamp polarizing current through a lead ion-selective electrode. Standardized (0.0025M) lead perchlorate is the titrant. The potential break at the endpoint is determined graphically from the titration curve and related to the total sulfur in the petroleum sample.
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