title: pH-Metric determination of acid numbers in petroleum oils without titration.
abstract: A new pH-metric method without titration has been developed for determination of acid numbers lower than 0.1 mg (KOH) g(-1) (oil) in petroleum oils such as White, Transformer and Basic oils. The method is based on rapid and complete extraction of acids from an oil test portion into the novel reagent and measurement of the conditional pH in the ;oil-reagent' mixture by a glass electrode. The method has a quantitation limit equal to 1x10(-3) mg (KOH) g(-1) (oil), uses non-toxic reagents, is not time and labor consuming, and is cheap and simple for automation.
authors.affiliation: The National Physical Laboratory of Israel, Danziger A. Building, The Hebrew University, Givat-Ram, Jerusalem 91904, Israel.
authors.forename: Y I
authors.initials: YI
authors.lastname: Tur'yan
authors.forename: E
authors.initials: E
authors.lastname: Strochkova
authors.forename: O Y
authors.initials: OY
authors.lastname: Berezin
authors.forename: I
authors.initials: I
authors.lastname: Kuselman
authors.forename: A
authors.initials: A
authors.lastname: Shenhar