title: pH-Metric determination of acid values in oilseeds without titration.
abstract: A new pH-metric method for determination of acid values in oilseeds without titration has been developed in the range 0.6-10 and more mg KOH/g. The method is based on a rapid (1-2 min) selective and complete extraction of free fatty acids from an oilseed test portion into a special reagent A, separation of the solution from the solid oilseed material by centrifugation or filtration, transfer of an aliquot of the solution into a pH-metric cell with reagent B for measurement of conditional pH(1)' of the formed mixture, addition of standard acid (HCl or H(2)SO(4)) and pH(2)' measurement. The reagents are non-toxic, and the method is rapid. Its metrological parameters for Soybean, Canola and Sunflower oilseeds are satisfactory for practical purposes.
authors.affiliation: The National Physical Laboratory of Israel, Danziger 'A' Bldg., The Hebrew University, Givat-Ram, Jerusalem 91904, Israel.
authors.forename: I
authors.initials: I
authors.lastname: Kuselman
authors.forename: Y I
authors.initials: YI
authors.lastname: Tur'yan
authors.forename: T
authors.initials: T
authors.lastname: Burenko
authors.forename: I
authors.initials: I
authors.lastname: Goldfeld
authors.forename: B
authors.initials: B
authors.lastname: Anisimov