ISO-14849-1999.pdf
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1、A Reference number ISO 14849:1999(E) INTERNATIONAL STANDARD ISO 14849 First edition 1999-08-01 Plastics Phenol-formaldehyde mouldings Determination of free ammonia and ammonium compounds Indophenol method Plastiques Pices moules base de phnoplastes Dosage de lammoniac libre et des composs ammoniacau
2、x Mthode lindophnol Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 19:56:09 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14849:1999(E) ISO 1999
3、All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Cas
4、e postale 56 CH-1211 Genve 20 Switzerland Internetisoiso.ch Printed in Switzerland ii Contents 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Principle2 5 Reagents.2 6 Apparatus.3 7 Preparation of test sample4 8 Procedure.4 9 Expression of results 7 10 Precision.7 11 Test report8 Copy
5、right International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 19:56:09 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO 14849:1999(E) iii Foreword ISO (the Internat
6、ional Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has bee
7、n established 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. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical stand
8、ardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at lea
9、st 75 % of the member bodies casting a vote. International Standard ISO 14849 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 12, Thermosetting materials. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical
10、Standards 1/9972545001 Not for Resale, 04/22/2007 19:56:09 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/20
11、07 19:56:09 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISOISO 14849:1999(E) 1 Plastics Phenol-formaldehyde mouldings Determination of free ammonia and ammonium compounds Indophenol method 1 Scope This International Standard specifies a colorimetr
12、ic comparison method for the determination of the amount of ammonia and ammonium compounds in phenol-formaldehyde mouldings. NOTE This International Standard does not provide an absolute measure of the amount of ammonia present. The amount of ammonia in a moulded article is of importance when corros
13、ion of metal inserts or contamination of foodstuffs in contact with the article has to be considered. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequ
14、ent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the l
15、atest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 565:1990, Test sieves Metal wire cloth, perforated metal plate and electroformed sheet Nominal sizes of openings. ISO 648:1977, Laboratory glassware
16、One-mark pipettes. ISO 835-2:1981, Laboratory glassware Graduated pipettes Part 2: Pipettes for which no waiting time is specified. ISO 1042:1988, Laboratory glassware One-mark volumetric flasks. ISO 3696:1987, Water for analytical laboratory use Specification and test methods. ISO 4788:1980, Labora
17、tory glassware Graduated measuring cylinders. ISO 4793:1980, Laboratory sintered (fritted) filters Porosity grading, classification and designation. ISO 5725-2:1994, Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and r
18、eproducibility of a standard measurement method. 3 Terms and definitions For the purposes of this International Standard, the following terms and definitions apply. 3.1 free ammonia ammonia that is present in the form of NH3 in phenol-formaldehyde mouldings Copyright International Organization for S
19、tandardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 19:56:09 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 14849:1999(E) ISO 2 3.2 ammonium compound an ammonium salt, present in a phenol-forma
20、ldehyde moulding, that has been produced by the reaction of ammonia with acid NOTE In this method, ammonium compounds are determined as NH3. 4 Principle The ammonia in a test portion of ground mouldings is extracted by heating with water. The extract is then distilled in alkaline conditions. The amm
21、onia present in the distillate is determined by measuring the spectrophotometric absorbance of the indophenol blue generated by the reaction with phenol in the presence of hypochlorite ions. The reactions are as follows: 5 Reagents During the analysis, use only ammonia-free reagents of recognized an
22、alytical grade, and only ammonia-free distilled water of grade 3 as defined in ISO 3696. 5.1 Potassium permanganate. 5.2 Sodium hydroxide, 2 % solution. 5.3 EDTA solution. Dissolve 5 g of ethylenediaminetetraacetic acid disodium dihydrate in 100 ml of water. 5.4 Sodium phenolate solution. Dissolve 2
23、0 g of sodium hydroxide in 100 ml of water. Then dissolve 25 g of phenol in 55 ml of this NaOH solution. Allow to cool to room temperature and add 6 ml of acetone. Dilute the resulting solution to 200 ml with water. Since the solution of sodium phenolate tends to absorb carbon dioxide from the atmos
24、phere, prepare it immediately before use. 5.5 Sodium hypochlorite solution, available-chlorine content 0,01 g/ml. Determine the concentration of available chlorine in a solution of sodium hypochlorite with an available-chlorine content between 0,05 g/ml and 0,12 g/ml and dilute it with water so that
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