1026 International Standard (ISO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION·MEXAYHAPOAHAA OPIAHW3AUMA NO CTAHAAPTM3ALWMORGANISATION INTERNATIONALE DE NORMALISATION Fruit and vegetable products -- Determination of dry matter content by drying under reduced pressure and of water content by azeotropic distillation Produits derives des fruits et legumes - Determination de la teneur en matiere seche par dessiccation sous pression réduite et déterminationdelateneureneaupardistillationazéotropique First edition -- 1982-03-01 UDC 634.1/635.6 : 543.8 Ref. No. ISO 1026-1982 (E) 1026-1982 ( Descriptors : agricultural products, fruit and vegetable products, tests, determination of content, solids. 8 Price based on 4 pages CopyrightInternational Organization for Standardization 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 1026 was developed by Technical Committee ISO/TC 34, Agricultural food products, and was circulated to the member bodies in December 1980. It has been approved by the member bodies of the following countries : Australia Philippines Iran Bulgaria Iraq Poland Canada Ireland Portugal Romania Czechoslovakia Israel Egypt, Arab Rep. of Kenya South Africa, Rep. of Ethiopia Korea, Dem. P. Rep. of Spain France Sri Lanka Korea, Rep. of Germany, F. R. Thailand Malaysia Hungary Netherlands USSR Yugoslavia India Pakistan No member body expressed disapproval of the document. This International Standard cancels and replaces ISO Recommendation R 1026-1969, of which it constitutes a technical revision. @ International Organization for Standardization, 1982 Printed in Switzerland icense from IHS Not for Resale ISO 1026-1982 (E) INTERNATIONAL STANDARD Fruit and vegetable products -- Determination of dry matter content by drying under reduced pressure and of water content by azeotropic distillation 1 Scope and field of application containing sulphuric acid, placed in front of the tap ensuring expansion of the air. The temperature shall be uniform at all This International Standard specifies a method for the deter- points in the oven. mination of the dry matter content of fruit and vegetable pro- ducts by drying under reduced pressure, and a method for the 2.3.2 Desiccator, provided with an efficient desiccant. determination of water content by azeotropic distillation. 2.3.3 Dishes, of corrosion-resistant metal (aluminium, nickel, The method by drying under reduced pressure is applicable to or, preferably, thin stainless steel), cylindrical with a flat bottom all fruit and vegetable products, with the exception, however, (for example, of diameter about 60 mm and height 25 mmi, of products for which drying would modify the state of the provided with well-fitting lids (see 2.7.1). components, and of certain products having a water content below 10 %. 2.3.4 Glass rods, of length appropriate to the size of the In these latter cases, the dry matter content may be obtained by dishes (2.3.3). difference after determination of the water content by azeo- tropic distllation. This latter method, however, is subject to 2.3.5 Analytical balance. certain restrictions, for example products soluble in water or benzene, or products rich in certain volatile substances or fermentation products. 2.4 Materials 2.4.1 Paper strips, for liquid products. Determination of dry matter content Use