1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ICS 59.060.10 ISBN 0-626-14146-X SANS 3074:2003 Edition 1 ISO 3074:1975 Edition 1 SOUTH AFRICAN NATIONAL STANDARD Wool Determination of dichloromethane-s
4、oluble matter in combed sliver This national standard is the identical implementation of ISO 3074:1975 and is adopted with the permission of the International Standards Organization. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax
5、: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa 2003 SANS 3074:2003 Edition 1 ISO 3074:1975 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard was approved by STANSA SC 5110.04C, Chemical analysis, in accordance with proce
6、dures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. INTERNATIONAL STANDARD 3074 INTERNATIONAL ORGAfJIZATION FOR STANDARDIZATION .MEikJJHAPO,qHA5l OPI-AHM3ALJM(I I-IO Cl-AHAPTM3ALUiM*ORGANISATION INTERNATIONALE DE NORMALISATION wo01 - Determination of dichloromethane
7、-soluble matter in combed sliver Laine - Dbermination de Iextrait dichloromethanique dans un ruban de peigne First edition - 1975-12-15 UDC 677.31-486.7 : 677.014.53 : 547.2 Ref. No. ISO 3074-1975 (E) Descriptors : wool, tests, Chemical analysis, determination of content, fats, oils, soluble matter,
8、 chloromethanes. Price based on 3 pages FOREWORD ISO (the International Organization for Standardization) is a worldwide federation of national Standards institutes (ISO Member Bodies). The work of developing International Standards is carried out through ISO Technical Committees. Every Member Body
9、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 Committee
10、s are circulated to the Member Bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 3074 was drawn up by Technical Committee ISO/TC 38, Textiles, and circulated to the Member Bodies in October 1974. lt has been approved by the Member B
11、odies of the following countries : Austral ia Belgium Bulgaria Canada Chile Czechoslovakia Denmark Finland France Germany Hungary India l ran Ireland Israel Japan Netherlands New Zealand No Member Body expressed disapproval of the document. Poland Romania South Africa, Rep. of Spain Swede n Turkey U
12、.S.A. U.S.S. R. Yugoslavia This International Standard is based on Test Method IWTO-10-66, drawn up by the International Wool Textile Organization (1 WTO). 0 International Organkation for Standardkation, 1975 l Printed in Switzerland INTERNATIONAL STANDARD ISO 3074-1975 (E) Wool- Determination of di
13、chloromethane-soluble matter in combed sliver 0 INTRODUCTION Wool textiles may contain solvent-extractable oils and fats. These are derived mainly from a) the wool grease occurring naturally in raw wool; b) oils added to assist textile processing; c) detergents picked up during washing and scouring
14、processes; d) special finishing agents. The amount of these substances present depends on the Stage of manufacture and its estimation is important for determining the clean wool content of a Sample. These different materials connot be estimated individually by solvent extraction methods, since there
15、 are no known solvents that are specific for each component. Hence, it is only possible to determine the amount of these substances extracted by a given solvent under specified conditions, any additional information being obtained by detailed analysis of the extracted material. Dichloromethane is re
16、cognized as a suitable solvent for extracting oils and fats. The method described in this International Standard is based on the results of inter-laboratory trials organized by the Technical Committee of the International Wool Textile Organization. 1 SCOPE AND FIELD OF APPLICATION This International
17、 Standard specifies a method for determining the dichloromethane-soluble matter in combed wool sl iver. Its use may be extended to wool in other forms. lt should be recognized that extraction with dichloro- methane under the prescribed conditions does not completely remove all the fatty material pre
18、sent in a Sample of wool. A further amount, possibly material of similar Character, will usually be extracted by the use of solvents that Cause greater swelling of the wool fibres. The method is applicable only to 100 % wool products. lt may give misleading results if applied to products in which fi
19、bres other than wool are present. 2 REFERENCES ISO 139, Textiles - Standard a tmospheres for conditioning and tes ting. ISO 1 130, Textile fibres - some methods of sampiing for tes ting. 3 DEFINITION dichloromethane-soluble extract : The material extracted from wool by dichloromethane under prescrib
20、ed conditions. 4 PRINCIPLE Extraction of a known amount of wool in a Soxhlet apparatus with dichloromethane. Filtration of the dichloromethane Solution, evaporation of the solvent and determination of the mass of the residue. 5 REAGENTS 5.1 Dichloromethane (methylene chloride), boiling range 39 to 4
21、1 “c. When 100 ml of the solvent is evaporated, the residue shall not exceed 1 mg. WARNING. Dichloromethane is toxic : the room in which extractions are made shall be adequately ventilated. 5.2 Acetone, analy.tical reagent quality. 6 APPARATUS 6.1 Soxhlet extraction apparatus assembled with ground g
22、lass joints and protected against the entry of moisture. The extractor (barrel) of the Soxhlet shall conveniently have a capacity of about 200 to 300 ml and the flask 250 ml. (Note of the volume of the extractor shall be made in the test report. ) 6.2 Water-bath or other suitable means of low temper
23、ature heating. 1 ISO 3074-1975 (E) 6.3 iarge Balance, with an accuracy of 0,05 g, preferably with scale-pan. 6.4 Analytical balance, accurate to 0,000 1 g. 6.5 Desiccator. 6.6 Drying oven, capable of being controlled at a temperature of 105 i 3 “C. .7 Conical flasks, 100 ml capacity. 6.8 Funnel. 6.9
24、 Distillation mit. 6.10 F-at-free filter Papers.1 ) 7 CONDITIONING AND TESTING ATMOSPHERE The atmospheres for pre-conditioning, conditioning and testing shall be those specified in IS0 139. 8 SAMPLING The laboratory Sample shall be representative of the bulk of material and shall be sufficient to pr
25、ovide two test specimens each of mass approximately 20 g. Useful information on sampling is given in IS0 1130. 9 PROCEDURE 9.1 Pre-condition the laboratory Sample as specified in IS0 l39# and then bring it to constant mass by exposing it for not less than 24 h in the Standard atmosphere for testing
26、(see clause 7). 9.2 In the Standard atmosphere for testing, prepare two test specimens each sf mass 20 + 0,05 g. For each duplicate test, introduce the test specimen into the Soxhlet barrel in such a way that the extract will not carry wool fibres into the Siphon tube and that the level of the top o
27、f the test specimen is below that of the end of the Siphon tube. A particle-free extract may be secured by one of the following methods : a) Insert a glass wool plug at the bottom of the Soxhlet barrel, effectively covering the exit tube. b) Pack the test specimen into a Soxhlet thimble covering wit
28、h a loose plug of dichloromethane-extracted cotton wool. c) Enclose the test specimen in a Iightweight woven or knitted dichloromethane-extracted fabric. If a water-bath is used, heat it to approximately 45 “C. Assemble the flask and Soxhlet barrel. Pour into the barrel sufficient dichloromethane (5
29、.1) to Cause a first siphoning, together with a small excess. Complete the assembly of condenser, Soxhlet barrel, flask and heating device. Check that all joints -arc tight. Adjust the heating so that satisfactory siphoning occurs at the rate of not less than 6 cycles per hour. Allow 20 to 24 siphon
30、ings, adding additional solvent if desired. Reject any test in which the siphoning does not function correctly. 9.3 Filter the contents of the extraction flask, previously concentrated (if necessary) to approximately 25 ml, through filter Paper (6.10) into a tared 100 ml conical flask (6.7) which is
31、 heated on a boiling water-bath, but not in direct contact with the w specimen, by the formula : lOOm, m2 is the dry mass, in grams, of the extracted test specimen. 20-m, where rnl is the mass, in grams, of the dichloromethane- 11 TEST REPORT soluble extract. The test report shall include the follow
32、ing infor- mation : 10.2 The dichloromethane-soluble extract is given, as a percentage of the dry mass of the de-greased specimen, by the following formula : IOOm, m2 reference to th is International Standard; b) the individual results and their mean, stating whether the results are expressed as a percentage of the dry mass or the conditioned mass of the de-greased wool; 4 the volume of the Soxhlet extractor;
