Revised Standard from Last Update.

1. SCOPE

1.1 This Indian Standard (Part 33) describes the procedure for the determination of sulphur in petroleum products, including lubricating oils containing additives, additive concentrates and lubricating greases, that cannot be burned completely in a wick lamp. The method is applicable to any petroleum product sufficiently low in volatility that it can be weighed accurately in an open sample boat and containing at least 0.1 percent sulphur.

1.2 This method is not applicable to samples containing elements that give residues, other than barium sulphate, which are insoluble in dilute hydrochloric acid solutions and would interfere in the precipitation step. These interfering elements include iron, aluminium, calcium, silicone and lead, which are sometimes present in greases, lube oil additives, or additive oils. Other acid insoluble materials that interfere are silica, molybdenum disulphide, asbestos, mica, etc. The method is not applicable to used oils containing wear metals and lead or silicates from contamination.

NOTE - Samples that are excluded may be analyzed by the method ASTM D1552 Test for sulphur in petroleum products (high temperature method).

2. REFERENCES

The standards given below contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of these standards.

265 : 1993 Hydrochloric acid - Specification (fourth revision)

1083 : 1978 Specification for industrial white oils (first revision)

1447 (Part 1) : 2021 Methods of sampling of petroleum and its products: Part 1 Manual sampling (second revision)

1448 (Part 6) : 1984 Method of test for petroleum and its products: Part 6 Heat of combustion of liquid hydrocarbon fuels by bomb calorimeter method (first revision)