Methods of test for petroleum and its products. Determination of saponification number Potentiometric titration method - Section 136.2: Potentiometric titration method

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Hardcopy , PDF

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English

Published date

15-02-2000

Publisher

British Standards Institution

Identical with IP 136 Section 2/99

This part of ISO 6293 specifies a method for the determination, by potentiometric titration, of the amount of constituents in petroleum products that will saponify under the conditions of the test. ISO 6293-1 specifies a determination by colour indicator titration.

The method is applicable to materials having saponification numbers in the range 2 mg KOH/g to 200 mg KOH/g.

Compounds of sulfur, phosphorus, halogens and some other compounds react with the alkali and acids under the test conditions.

NOTES

1 The results on used crankcase and turbine oils, and on oils containing the compounds above as additive constituents, should be interpreted with care, bearing in mind the possible higher values obtainable due to these additional reactions.

2 These extraneous materials include certain organic acids and most non-alkali soaps. The odour of hydrogen sulfide near the end of the back-titration step is an indication of the presence of certain reactive sulfur compounds, but other reactive sulfur compounds, as well as those of chlorine, phosphorus and other interfering materials, give no simple indication during the test. A gravimetric determination of fatty acid content is an alternative procedure for the estimation of such compounds.

Committee	PTI/13
DocumentType	Standard
Pages	10
PublisherName	British Standards Institution
Status	Current

Standards	Relationship
ISO 6293-2:1998	Identical

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BS 2000-136-2:1999

Methods of test for petroleum and its products. Determination of saponification number Potentiometric titration method - Section 136.2: Potentiometric titration method

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