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ISO 7537:1997

Current Revision

Petroleum products -- Determination of acid number -- Semi-micro colour-indicator titration method

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This International Standard specifies a semi-micro colour-indicator method for the determination of acidic constituents in new or used petroleum products and lubricants soluble in mixtures of toluene and propan-2-01, or capable of existing as suspensions in such mixtures, and where the suspended material is sufficiently dissociated that its acidic components can be titrated.

The method is especially intended for applications in which the amount of sample available to be analysed is too small to allow accurate analysis by ISO 6619 or ISO 6618. It is applicable to the determination of acids having dissociation constants in water larger than 10−9. Extremely weak acids having dissociation constants smaller than 10−9 do not interfere. Salts titrate if their hydrolysis constants are larger than 10−9.


SDO ISO: International Organization for Standardization
Document Number ISO 7537
Publication Date Not Available
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO TC 28
Publish Date Document Id Type View
Not Available ISO 7537:1997 Revision