IS 1448 Pt.83-1974

标准号：IS 1448 Pt.83-1974
发布日期：1975/5/1 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：1.1 This method describes procedures for the determination of total sulphur in petroleum products. These procedures are applicable to volatile sulphur in natural, refinery, and liquefied petroleum gases; and to total sulphur in light distillate feed-stocks, solvents, gasolines, kerosines, gas oils, fuel oils, crudes, residues, and some lubricating oils. The method is particularly suitable for distillates with total sulphur contents of less than 300 ppm. Samples which are viscous, aromatic, or of high sulphur content are first diluted with a solvent.1.2 In the thorin finish, chlorine and nitrogen in the sample may exceed the sulphur concentration by several times without causing interference. Fluo-rine interferes, if present in concentrations higher than 30 percent of the sul-phur content. Phosphorus and cations interfere. Sodium, potassium, zinc, magnesium, and ammonium ions reduce results by 2 to 3 percent due to co-precipitation. Cations forming insoluble sulphates interfere quantita-tively and many other metal ions interfere by forming coloured complexes with thorin in alcoholic solutions. However, in the amounts normally present in products these interferences are not significant but do preclude the use of the method on most lubricating oils containing additives.