PH-metric determination of acid numbers of petroleum oils without titration
Kuselman, I.; Tur'yan, Y.I.; Strochkova, E.; Goldfeld, I.; Shenhar, A.
Journal - Association of Official Analytical Chemists 83(2): 282-289
2000
ISSN/ISBN: 0004-5756 PMID: 10772165 Document Number: 512392
A pH-metric method was developed for determination of the acid numbers of oils containing organic and inorganic acids at levels <0.1 mg KOH/g oil. The method is based on rapid and complete extraction of acids from a test portion of oil into a special reagent, and measurement of the conditional pH of the mixture "oil-reagent" by a glass electrode. The method uses nontoxic reagents, is not time and labor consuming, and is cheap and simple enough for automation.