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ISO 4326:1980

Current Revision

Non-ionic surface active agents -- Polyethoxylated derivatives -- Determination of hydroxyl value -- Acetic anhydride method

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The hydroxyl group is esterified by acetic anhydride in pyridine solution. The excess of acetic anhydride is hydrolized with water. The acidity which appears during the esterification and the acetic acid formed during the hydrolysis are neutralized by sodium hydroxide solution in the presence of phenolphthalein as indicator. The hydroxyl value is calculated from the difference between the volume od sodium hydroxide solution used for the titration of the blank and of the test solution.


SDO ISO: International Organization for Standardization
Document Number ISO 4326
Publication Date Not Available
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO TC 91
Publish Date Document Id Type View
Not Available ISO 4326:1980 Revision