BS-2924-2-1992 ISO-6587-1992.pdf
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1、BRITISH STANDARD BS 2924-2: 1992 ISO 6587:1992 Aqueous extracts of paper, board and pulp Part 2: Determination of conductivity Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:51:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2924-2:1992 This British Standard, having been prepared under t
2、he direction of the Paper and Printing Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 July 1992 BSI 08-1999 First published as part of BS 2924 December 1957 Second edition September 1968 First published as BS 2924-2 October 1983 Secon
3、d edition July 1992 The following BSI references relate to the work on this standard: Committee reference PAM/11 Draft for comment 91/41083 DC ISBN 0 580 21032 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Paper and Printing Standard
4、s Policy Committee (PAM/-) to Technical Committee PAM/11, upon which the following bodies were represented: British Fibreboard Packaging Association British Paper and Board Industry Federation (PIF) British Printing Industries Federation British Telecommunications plc Envelope Makers and Manufacturi
5、ng Stationers Association Her Majestys Stationery Office Man-made Fibres Producers Committee Ministry of Defence Paper Sack Development Association Ltd. PIRA (The Research Association for the Paper and Board, Printing and Packaging Industries) Post Office Society of British Printing Ink Manufacturer
6、s University of Manchester Institute of Science and Technology Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:51:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2924-2:1992 BSI 08-1999i Contents Page Committees responsibleInside fr
7、ont cover National forewordii 1Scope1 2Normative references1 3Principle1 4Reagents1 5Apparatus1 6Sampling and preparation of the sample1 7Procedure2 8Calculation and expression of results2 9Test report3 Table 1 Conductivity of potassium chloride standard solutions1 List of referencesInside back cove
8、r Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 02:51:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2924-2:1992 ii BSI 08-1999 National foreword This Part of BS 2924 has been prepared under the direction of the Paper and Printing Standards Policy Committee. It is identical with ISO 6587:
9、1992 Paper, board and pulps Determination of conductivity of aqueous extracts, published by the International Organization for Standardization (ISO). This edition supersedes BS 2924-2:1983, which is withdrawn. A British Standard does not purport to include all the necessary provisions of a contract.
10、 Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International StandardCorresponding British Standard ISO 186:1985BS 3430:1986 Method for sampling to determine the
11、 average quality of paper and board (Identical) ISO 287:1985BS 3433:1986 Method for determination of moisture content of paper and board by the oven-drying method (Identical) ISO 638:1978BS 4502:1980 Method for determination of dry-matter content of pulps (Identical) ISO 7213:1981BS 6269:1982 Method
12、 for sampling pulps for testing (Identical) IEC 554-2:1977BS 5626 Cellulosic papers for electrical purposes Part 2:1979 Methods of test (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, an inside back cover and a back cover. This
13、 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, Wed Nov 29 02:51:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2924-2:1992 BSI 08-19991 1
14、Scope This International Standard specifies a method for the determination of the conductivity of aqueous extracts of paper, board or pulp, these extracts having been prepared by a hot or a cold method. The method is applicable to all kinds of paper, board and pulps, except for papers used for elect
15、rical purposes. For high purity papers used for electrical purposes, the method used should be that given in IEC 554-2. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of public
16、ation, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registe
17、rs of currently valid International Standards. ISO 186:1985, Paper and board Sampling to determine average quality. ISO 287:1985, Paper and board Determination of moisture content Oven-drying method. ISO 638:1978, Pulps Determination of dry matter content. ISO 7213:1981, Pulps Sampling for testing.
18、IEC 554-2:1977, Specification for cellulosic papers for electrical purposes Part 2: Methods of test. 3 Principle A 2 g sample is extracted for 1 h with 100 ml of boiling or cold, distilled or deionized water. Measurement of the conductivity of the extract at 25 C by means of a conductivity meter or
19、resistance bridge, using alternating current. 4 Reagents 4.1 Distilled or deionized water Distilled or deionized water shall be used throughout the test. The conductivity of the water shall not exceed 0,2 mS/m after boiling and cooling as specified in 7.2.2 (see note 2). NOTE 1Usually, both distilla
20、tion and deionization are required. Unless great care is exercised when distilling, and with the materials employed in the condenser and subsequent surfaces with which the condensed vapour would possibly come in contact, the distillate can fail to reach the required level of conductivity. NOTE 2When
21、 it is not possible to obtain water of the specified purity, water with a higher conductivity may be used, but the conductivity of the water used should be stated in the test report. 4.2 Potassium chloride, standard solutions. Use potassium chloride (KCl) of recognized analytical reagent grade, powd
22、ered, or fine crystals. Dry for 2 h at 105 C 2 C and immediately prepare the following two solutions. 4.2.1 0,01 mol/l solution Dissolve 0,745 5 g of the potassium chloride in water having a conductivity not greater than 0,2 mS/m, and dilute to 1 000 ml. 4.2.2 0,001 mol/l solution Dilute 100 ml of t
23、he 0,01 mol/l solution (4.2.1) to 1 000 ml. Store the solutions in waxed glass bottles with ground glass stoppers. The conductivity values, in millisiemens per metre, of the two solutions are given in Table 1. Table 1 Conductivity of potassium chloride standard solutions 5 Apparatus Ordinary laborat
24、ory apparatus, and 5.1 Flasks of chemically resistant glass, with ground glass joints, stoppers and efficient water-cooled reflux condensers made of the same quality of glass. All glassware shall be carefully rinsed with boiling distilled or deionized water (4.1). 5.2 Electric heater, adjustable at
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