934 International Standard (ISO Animal and vegetable fats and oils - Determination of water content - Entrainment method Corps gras d'origines animale et vegétale -- Détermination de la teneur en eau -- Méthode par entrainement First edition - 1980-08-01 UDC 664.3 : 543.812 Ref. No. ISO 934-1980 (E) (3) sO 934-1980 Descriptors : fats, animal fats, vegetable fats, chemical analysis, determination of content, water, distilation method, test equipment. apparatus. Price based on 2 pages itted without license from IHS Not for Resale Foreword ISO (the international Organization for Standardization) is a worldwide federation of national standards institutes (ISO member bodies). The work of developing Inter- national Standards is carried out through ISO technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 934 was developed by Technical Committee ISO/TC 34, Agricultural food products, and was circulated to the member bodies in February 1979. it has been approved by the member bodies of the following countries : Hungary Romania Australia Bulgaria India South Africa, Rep. of Canada Israel Spain Kenya Thailand Cyprus Czechoslovakia Korea, Rep. of Turkey Egypt, Arab Rep. of Malaysia United Kingdom Ethiopia Mexico Yugoslavia France Netherlands Germany, F.R New Zealand No member body expressed disapproval of the document. This International Standard cancels and replaces IS0 Recommendation R 934-1969, of which it constitutes a technical revision. This International Standard has also been approved by the International Union of Pure and Applied Chemistry (IUPAC). International Organization for Standardization, 1980 Printed in Switzerland Copyright Interational Organization for Standardization cense from IHS Not for Resale ISO 934-1980 (E) INTERNATIONAL STANDARD Animal and vegetable fats and oils -- Determination of water content Entrainment method Scope and field of application 6.2.3 Receiver, having a graduated tube of capacity 5 ml, 1 interposed between the flask (6.2.1) and the condenser (6.2.2). This International Standard specifies a method for the deter mination, by entrainment, of the water content of animal or NOTE -- In order to remove all traces of fat from the graduated tube of the receiver and the inside of the condenser tube, thoroughly clean the vegetable fats or oils. apparatus by suitable means, and wash successively with distilled The method is applicable to products having water contents without heating. greater than or equal to 0,5 % (m / m). 6.3 Boiling aid, for example pumice-stone fragments. 2 Reference Sampling Iso 661, Animal and vegetable fats and oils - Preparation of 7 test sample. Proceed from a representative sample of at least 250 g. Definition Procedure 8 water content : The amount of water entrained and collected under the conditions specified in this International Standard, 8.1 Preparation of the test sample and expressed as a percentage by mass. Prepare the test sample in accordance with ISO 661. 4Principle 8.2 Test portion Entrainment of the water present in a test portion, by Weigh, to the nearest 0,01 g, 20 to 100 g of the test sample azeotropic distillation with the aid of an organic liquid not (8.1), according to the expected water content, into the flask miscible with water, and measurement of the volume of water (6.2.1). collected. 8.3 Determination 5 Reagent Add to the flask containing the test portion (8.2), 100 to 300 ml (according to the mass of the test portion) of the xylene Xylene, commerciai quality, containing isomers or mixtures of (clause 5) and a boiling aid