BS-EN-ISO-1741-1995.pdf
BRITISH STANDARD BS EN ISO 1741:1995 Dextrose Determination of loss in mass on drying Vacuum oven method The European Standard EN ISO 1741:1994 has the status of a British Standard UDC 664.162:543.81 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:56:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 1741:1995 This British Standard, was published under the authority of the Standards Board and comes into effect on 15 January 1995 © BSI 01-2000 The following BSI reference relate to the work on this standard: Draft announced in BSI News, March 1993 ISBN 0 580 23176 3 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: AustriaOesterreichisches Normungsinstitut BelgiumInstitut belge de normalisation DenmarkDansk Standard FinlandSuomen Standardisoimisliito, r.y. FranceAssociation française de normalisation GermanyDeutsches Institut für Normung e.V. GreeceHellenic Organization for Standardization IcelandTechnological Institute of Iceland IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione LuxembourgInspection du Travail et des Mines NetherlandsNederlands Normalisatie-instituut NorwayNorges Standardiseringsforbund PortugalInstituto Portuguès da Qualidade SpainAsociación Española de Normalización y Certificación SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:56:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 1741:1995 © BSI 01-2000i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 1Scope and field of application3 2Principle3 3Apparatus3 4Procedure3 5Expression of results3 6Test report3 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:56:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 1741:1995 ii © BSI 01-2000 National foreword This British Standard has been prepared under the direction of the BSI Standards Board and is the English language version of EN ISO 1741:1994 Dextrose Determination of loss in mass on drying Vacuum oven method, published by the European Committee for Standardization (CEN). It is identical with ISO 1741:1980 Dextrose Determination of loss in mass on drying Vaccum oven method, published by the International Organization for Standardization (ISO). This British Standard has been produced to fulfil BSIs obligation to publish all approved European Standards but, because of the absence of interest in the UK in the subject concerned, there has been no UK participation in the preparation of EN ISO 1741. Any queries relating to the EN should be directed to BSI. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, pages 2 and 3 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:56:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN ISO 1741 August 1994 UDC 664.162:543.81 Descriptors: Carbohydrates, glucose, tests, determination, mass losses, dehydration analysis, stoves (chemistry), low pressure tests English version Dextrose Determination of loss in mass on drying Vacuum oven method (ISO 1741:1980) Dextrose cristallisé Détermination de la perte de masse à la dessiccation Méthode par étuvage sous pression réduite (ISO 1741:1980) Dextrose Bestimmung des Masseverlustes durch Trocknen Vakuumschrank-Verfahren (ISO 1741:1980) This European Standard was approved by CEN on 1994-08-22. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 1994 Copyright reserved to CEN members Ref. No. EN ISO 1741:1994 E Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:56:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 1741:1994 © BSI 01-2000 2 Foreword The text of the International Standard ISO 1741:1980, prepared by ISO/TC 93, Starch, was submitted to the formal vote and was approved by CEN as EN ISO 1741:1994 on 1994-08-22 without any modifications. This European Standard shall be given the status of a national standard, either by publication of and identical text or by endorsement, at the latest by February 1995, and conflicting national standards shall be withdrawn at the latest by February 1995. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:56:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 1741:1994 © BSI 01-20003 1 Scope and field of application This International Standard specifies a vacuum oven method for the determination of the loss in mass on drying of dextrose. The method is applicable to anhydrous dextrose and to dextrose monohydrate. 2 Principle Drying of the test portion in a vacuum oven at 100 °C, at a pressure not exceeding 135 mbar1). 3 Apparatus 3.1 Analytical balance 3.2 Dish, of metal (inert under the test conditions) or of glass, of diameter approximately 50 mm, provided with a closely fitting lid. 3.3 Electrically heated vacuum oven, capable of being maintained at 100 ± 1 °C, equipped with a calibrated thermometer and an absolute pressure gauge. The drying oven shall provide uniform heat distribution and shall maintain the reduced pressure for several hours after the vacuum pump is turned off. The oven shelves shall be so constructed and fitted as to ensure good heat transfer to the dishes. 3.4 Vacuum pump, suitable for reducing the pressure in the oven to 135 mbar or less. 3.5 Drying train, consisting of a drying column filled with dried silica gel; the column is connected in series to a gas scrubber containing concentrated sulphuric acid, which is in turn connected to the air inlet of the drying oven. 3.6 Desiccator, containing an efficient desiccant. 4 Procedure 4.1 Preparation of the test sample Mix the sample thoroughly and rapidly by stirring with a spatula in the sample container. If the sample container is too small for this purpose, transfer the entire sample to another pre-dried container of a suitable size to facilitate mixing. 4.2 Preparation of the dish Place the open dish (3.2) and its lid in the oven (3.3), controlled at 100 °C for 1 h. Allow to cool to room temperature in the desiccator (3.6) and weigh to the nearest 0,000 2 g. 4.3 Test portion Place about 10 g of anhydrous dextrose or about 5 g of dextrose monohydrate, in the dish (3.2), fit the lid and weigh to the nearest 0,000 2 g. 4.4 Determination Place the covered dish (3.2) containing the test portion (4.3) in the oven (3.3) maintained at 100 ± 1 °C, remove the lid and leave it in the oven. Leave at the test temperature for 4 h, maintaining the pressure in the oven at not more than 135 mbar. During drying, draw a slow stream of air through the drying train (3.5) into the oven. After 4 h, shut off the vacuum pump (3.4) and allow air to slowly enter the oven through the drying train until atmospheric pressure is obtained. Before withdrawing the dish from the oven, fit the cover. Place the covered dish in the desiccator (3.6), allow to cool to room temperature, and weigh to the nearest 0,000 2 g. Do not put more than four dishes in the desiccator (3.6) at the same time. Carry out two determinations on the same test sample (4.1). NOTEIf, during or after the test, the material develops a more or less pronounced yellow colour, repeat the test at a lower temperature, and state this in the test report. 5 Expression of results The loss in mass on drying, expressed as a percentage by mass of the product as received, is equal to where m0is the mass, in grams, of the dish and cover (4.2); m1is the mass, in grams, of the dish and cover and the test portion before drying (4.3); m2is the mass, in grams, of the dish and cover and the test portion after drying (4.4). Take as the result the arithmetic mean of the two determinations. 6 Test report The test report shall indicate the method used and the result obtained. It shall also mention all operating conditions not specified in this International Standard, or regarded as optional, as well as any circumstances that may have influenced the result. The report shall include all details required for complete identification of the sample. 1) 1 mbar = 0,1 kPa m1 m2() × 100 m1 m0 - Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 13:56:24 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 1741:1995 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. 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