1、C AN/C GSB-4.2 NO. 73.5-M91/ NATIONAL STANDARD OF CANADA IS0 3073:1975 Textile Test Methods Wool - Determination of Acid Content Prepared by the International Organizati Reviewed by the Canadian Gener on la I for Sta Stan in this remains the continuing responsibility of the accredited standards-writ
2、ing organization. Those who have a need to apply standards are encouraged to use National Standards of Canada whenever practicable. These standards are subject to periodic review; therefore, users are cautioned to obtain the latest edition from the organization preparing the standard. The responsibi
3、lity for approving National Standards of Canada rests with the: Standards ,Council of Canada 350 Sparks Street Ottawa, Ontario KIP 6N7 How to order SS Publications: by Telephone - (819) 956-0425 or - (819) 956-0426 by Fax - (819) 956-5644 by Mail - CGSB, Sales Unit Ottawa, Canada K1A 1G6 in Person -
4、 Place du Portage III, 9C1 11 Laurier Street Hull, Quebec Copyright Canadian General Standards Board Provided by IHS under license with CGSBNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CGSB CAN/CGSB-4.2 N0=73=5-N9L * m L74b50 OOLL94L 29 m NATIONAL STANDARD OF CA
5、NADA CAN/CGSB-4.2 NO. 73.5-M91/ IS0 3073: 1975 TEXTILE TEST METHODS WOOL - DETERMINATION OF ACID CONTENT Prepared by the International Organization for Standardization Reviewed by the Canadian General Standards Board es Approved by the Standards Council of Canada Published June 1991 by the Canadian
6、General Standards Board Ottawa, Canada KIA 1G6 Minister of Supply and Services Canada - 1991 No part of this publication may be reproduced in any form without the prior permission of the publisher. Copyright Canadian General Standards Board Provided by IHS under license with CGSBNot for ResaleNo rep
7、roduction or networking permitted without license from IHS-,-,-CGSB CAN/CGSB-4-2 N0.73.5-fI9L tt m l187Lib50 001rL942 765 m L CANADIAN GENERAL STANDARDS BOARD COMMITTEE ON TEXTILE TEST METHODS (Membership at date of approval) Crown, Dr. E.M. Chairperson Biron, C. Clarke, Mrs. N. Cosman, Ms. V. Demer
8、s, A. Dolhan, Mrs. P. Duhamel, Ms. D. Edwards, D.S. Famworth, Dr. B. Graham, M. Grgoire, Miss M. Hurley, Ms. M. Kasem, Dr. M.A. King, Dr. M. Kiimes, A. Mitton, Miss M.T. Monk, W.B. Mortimer, R.A. Muniak, Ms. E. Patel, A. Rashid, M.A. Ronsyn, Dr. C. Routhier, D. Scrafton, Ms. K. Randall, Mrs. J. Secr
9、etary University of Alberta Celanese Canada Inc. Du Pont Canada Inc. Department of Consumer and Corporate Affairs Professional Association of Cleaners and Launderers of Quebec Department of National Defence Textile Technology Centre Canadian Carpet Institute Mustang Industries Inc. The Wool Bureau o
10、f Canada Ltd. Dominion Fabrics Inc. Department of National Revenue (Customs and Excise) Department of Consumer and Corporate Affairs University of Manitoba Dominion Textile Inc. Consultant Consultant ORTECH International The T. Eaton Company Canada Ltd. Sears Canada Inc. Department of Public Works,
11、Alberta Department of Supply and Services Consoltex Inc. The Retail Research Foundation of Canada Canadian General Standards Board Acknowledgment is made for the French translation of this National Standard of Canada by the Translation Bureau of the Department of the Secretary of State. CANKGSB-4.2
12、NO. 73.5-M91/ IS0 3073:1975 Copyright Canadian General Standards Board Provided by IHS under license with CGSBNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CGSB CAN/CGSB-4.2 N0.73.5-M91 XX W 1874650 OOLL943 bTL W National Standard of Canada TEXTILE TEST METHODS C
13、ANKGSB-4.2 Ottawa Canada KIA 1G6 NO. 73.5-M9l/ IS0 3073:1975 Preface to the Nationai Standard of Canada This National Standard of Canada has been prepared by the CGSB Committee on Textile Test Methods. It is identical in content and in layout with the International Standard IS0 3073, Wool - Determin
14、ation of acid content, published 1975-12-15 by the International Organization for Standardization (ISO). The international standard was reviewed by the CGSB committee to determine its suitability for Canadian use. It was agreed to use it in total, without editorial changes. Throughout this standard,
15、 the words “National Standard of Canada” are to be understood as replacing the words “International Standard” wherever they appear. Some terminology and conventions are not identical to those used in other test methods within CAN/CGSB-4.2-M - Textile Test Methods. For example, the comma is used thro
16、ughout this standard as a decimal marker rather than the point. The testing and evaluation of a product against this method may require the use of materials andor equipment that could be hazardous. This document does not purport to address ali the safety aspects associated with its use. Anyone using
17、 this method has the responsibility to consult the appropriate authorities and to establish appropriate health and safety practices in conjunction with any existing applicable regulatory requirements prior to its use. The referenced International Standard may be obtained from the Standards Council o
18、f Canada, Standards Sales Branch, 350 Sparks Street, Suite 1200, Ottawa, Ontario KIP 6N7. Copyright Canadian General Standards Board Provided by IHS under license with CGSBNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CGSB CANICGSB-4-2 N0.73.5-ML XXm 1874650 0011
19、944 538 INTERNATIONAL STANDARD IS0 3073-1975 (E) Wool - Determination of acid content 1 SCOPE AND FIELD OF APPLICATION 5.2 Conical flasks, 250 ml capacity. This International Standard specifies a method for determining the acid content of a wool sample, expressed as 5.3 Pipettes, 50 and 100 ml capac
20、ity. a percentage by mass. This method is applicable to undyed wool in any form, for example loose fibre, sliver, yarn or fabric. It is also applicable to dyed wool when the amount of dye extracted 5.4 Burette, 25 ml capacity. 5.5 Stqpeied weighing bottle. during the test does not interfere with the
21、 determination 5.6 Analytical to o,ooo g. of the end-point of the titration. 5.7 Desiccator. 5.8 Ventilated oven for drying samples at 105 f 3 “C. 2 PRINCIPLE Immersion of a known amount of the wool in a dilute solution of pyridine which extracts the acid from the wool. Determination of the amount o
22、f acid extracted, by titration 59 Mechanical shaker (optional) with standard sodium hydroxide solution. 5.10 Glass beakers, 250 ml capacity. 3 REFERENCE 5.1 1 Glass wool. IS0 1130, Textile fibres - Some methods of sampling for testing. 6 SAMPLING 4 REAGENTS Take a sample representative of the bulk a
23、nd of mass not less than 10 gl). It is assumed that the sample is commercially free from oil and fatty matter. Useful information on sampling is given in IS0 1130. 4.1 Pyridine, 5 g/l solution. Dissolve 5 g of pyridine (analytical grade) in 1 I of distilled water. 7 PROCEDURE 4.2 Sodium hydroxide, 0
24、.1 N solution. Standardize this solution by titration with standard 1 f 0,001 9. potassium hydrogen phthalate solution. 7.1 Take at least two test specimens representative of the sample, each of mass 2 f 0,001 g, and one specimen of mass 4.3 Phenolphthalein, 5 g/l ethanolic solution. 7.2 Place the 1
25、 g test specimen in a weighing bottle (5.5) and dry in the ventilated oven (5.8) at 105 f 3 “C. Stopper the bottle, cool in the desiccator (5.7) and determine. the constant mas.9) has been attained. Remove the contents of Dissolve O.5 Of phenolphthalein in 95 % ( ethanol mass of the bottle and antin
26、ue heating until and dilute to 100 ml with the same ethanol. 5 APPARATUS the bottle and determine the dry mass of the specimen by determining the mass of the empty bottle. NOTE - Ensure that each specimen is treated in such a way that all have the same moisture mntent. 5.1 Glass-stoppered conical fl
27、asks, 250 ml capacity. 1) This quantity is taken to provide for a second test if necessary 21 Constant mass may be deemed to have been attained when the change in mass of a specimen which has been redried for at least 30 min does not exceed 0.001 9. NO. 73.5-M91 1 Copyright Canadian General Standard
28、s Board Provided by IHS under license with CGSBNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CGSB CANICGSB-4-2 N0-73-5-MqL * L874b50 0011945 474 IS0 3073-1975 (E) 7.3 Place the other two test specimens in separate glass-stoppered conical flasks (5.1) and add 100
29、ml of pyridine solution (4.1) to each. Stopper each flask and shake on the mechanical shaker (5.9) for 1 h. Alternatively, allow each flask to stand overnight after initial shaking to ensure wetting of the specimen. Decant the liquid from each flask into separate glass beakers (5.10). filtering thro
30、ugh plugs of glass wool (5.11) to retain fibrous material. From each beaker, pipette 50 ml of the filtered liquid into separate conical flasks (5.2). add 3 drops of phenolphthalein solution (4.3) to each flask and titrate each extract with the sodium hydroxide solution (4.2) until a faint pink colou
31、r persists after a gentle shaking by hand. A potentiometric end-point determination is allowed. 8 EXPRESSION OF RESULTS The mass of acid, A, expressed as a percentage of the dry mass of the test specimen, is given by the formula : TxVxk m A =- where T is the normality of the sodium hydroxide solutio
32、n used for the titration; V is the volume, in millilitres, of sodium hydroxide solution used for the titration; k is a constant which has the following values : for calculating as hydrochloric acid : 3.65 for calculating as formic acid : 4.6 for calculating as sulphuric acid : 4.9 for calculating as
33、 acetic acid : 6.0 m is the dry mass, in grams, of the test specimen of mass approximately 1 g. 9 TESTREPORT The test report shall include the following information : a) the reference to this International Standard; b) the mean of the results obtained; c) the type of acid for which the calculation h
34、as been made; d) the mass of the acid for each of the two 2 g test specimens used and also the mean of the results obtained. 2 NO. 73.5-M91 Copyright Canadian General Standards Board Provided by IHS under license with CGSBNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
