BS-EN-ISO-119-1998.pdf
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1、BRITISH STANDARD BS EN ISO 119:1998 Implementing Amendment No. 1 to BS 2782-4: Method 451E: 1978/ISO 119:1977 (renumbers the BS as BS EN ISO 119:1998), not published separately Plastics Phenol-formaldehyde mouldings Determination of free phenols Iodometric method (ISO 119:1977) ICS 83.140.99 License
2、d Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 119:1998 BSI 05-1999 ISBN 0 580 10171 1 Foreword This British Standard is technically identical to International Standard ISO 119:1977 Plastics Phenol-formaldehyde mouldings Determination of
3、 free phenols Iodometric method. In 1998 the European Committee for Standardization (CEN) accepted ISO 119:1977 as European Standard EN ISO 119:1998. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correc
4、t 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 to 4, an inside back cover and a back cover. This standard has be
5、en updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments 10255October 1998Implementing European Standard Licensed Copy: sheffieldun sheffieldun, na, Mon
6、Nov 20 02:09:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 119:1998 BSI 05-1999i Contents Page ForewordInside front cover Foreword2 Text of EN ISO 1193 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:13 GMT+00:00 2006, Uncontrolled Cop
7、y, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 119 July 1998 ICS 83.080.10 Descriptors: See ISO document English version Plastics Phenol-formaldehyde mouldings Det
8、ermination of free phenols Iodometric method (ISO 119:1977) Plastiques Pices moules base de phnoplastes Dosage des phnols libres Mthode iodomtrique (ISO 119:1977) Kunststoffe Phenoplast-Formteile Bestimmung der freiem Phenole Iodometrisches Verfahren (ISO 119:1977) This European Standard was approve
9、d by CEN on 12 June 1998. 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 stan
10、dards 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
11、 the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and Unit
12、ed Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref. No. EN ISO 1
13、19:1998 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 119:1998 BSI 05-1999 2 Foreword The text of the International Standard from Technical Committee ISO/TC 61, Plastics, of the International Organization for Standardization (ISO)
14、 has been taken over as a European Standard by Technical Committee CEN/TC 249, Plastics, the Secretariat of which is held by IBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 1999, and
15、conflicting national standards shall be withdrawn at the latest by January 1999. According to CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, G
16、ermany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard ISO 119:1977 has been approved by CEN as a European Standard without any modification. Contents Page Forewo
17、rd2 1Scope and field of application3 2References3 3Principle3 4Reagents3 5Apparatus3 6Preparation of test sample3 7Procedure3 8Expression of results4 9Test report4 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:09:13 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 119:1998 BSI 05-19993
18、1 Scope and field of application This International Standard specifies an iodometric method for the semi-quantitative determination of the amount of free phenols in phenol-formaldehyde mouldings. NOTEThis International Standard does not provide an absolute measure of the free phenols present. The am
19、ount of free phenols in a moulded article is influenced to a major extent by the degree of cure. Its evaluation is also of interest where the possibility of contamination of foodstuffs or other materials in contact with the article has to be considered. 2 References ISO/R 385, Burettes. ISO 565, Tes
20、t sieves Woven metal wire cloth and perforated plate Nominal sizes of apertures. ISO 648, Laboratory glassware One-mark pipettes1). 3 Principle Hot aqueous extraction of free phenols from a powdered test portion. Iodination of the aqueous extract by a solution of iodine in the presence of sodium tet
21、raborate. Acidification, then immediate titration of the excess iodine with standard volumetric sodium thiosulphate solution, using a starch solution as indicator. Calculation of the result assuming the reaction of six atoms of iodine with each molecule of phenol. 4 Reagents During the analysis, use
22、 only reagents of recognized analytical grade, and only distilled water or water of equivalent purity. 4.1 Sodium tetraborate, decahydrate (Na2B4O7.10H2O). 4.2 Sulphuric acid, 2 N solution. 4.3 Iodine, about 0,05 N solution. Dissolve 6,35 g of iodine in approximately 40 ml of a 500 g/l solution of p
23、otassium iodide and dilute to 1 000 ml with water. 4.4 Sodium thiosulphate, 0,05 N standard volumetric solution. 4.5 Starch, approximately 2,5 g/l solution. 5 Apparatus Ordinary laboratory apparatus and 5.1 Means for reducing the mouldings to a powder. 5.2 Sieve, with nominal apertures of 250 m, com
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