BS-7164-22.1-1994.pdf
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1、BRITISH STANDARD BS 7164-22.1: 1994 Chemical tests for raw and vulcanized rubber Part 22: Determination of chlorine content Section 22.1 Parr bomb method UDC 678.763:543:546.13 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:35:00 GMT+00:00 2006, Uncontrolled
2、 Copy, (c) BSI BS 7164-22.1:1994 This British Standard, having been prepared under the direction of the Plastics and Rubber Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 August 1994 BSI 08-1999 The following BSI references relate to
3、the work on this standard: Committee reference PRM/23 Draft for comment 93/309891 DC ISBN 0 580 2332 6 X Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/23
4、, upon which the following bodies were represented: Institute of Water and Environmental Management Laboratory of the Government Chemist Ministry of Defence Royal Society of Chemistry Rubber and Plastics Research Association Amendments issued since publication Amd. No.DateComments Licensed Copy: Lon
5、don South Bank University, London South Bank University, Fri Dec 08 14:35:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7164-22.1:1994 BSI 08-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2References1 3Principle1 4Reagents1 5Apparatus1 6Sampling1 7Procedure1 8Cal
6、culation and expression of results2 9Test report2 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:35:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7164-22.1:1994 ii BSI 08-1999 Foreword This Section of 7164 has been prep
7、ared under the direction of the Plastics and Rubber Standards Policy Committee. It supersedes Section 3 of BS 903-B12:1960, which Section is withdrawn. BS 7164 rationalizes all the methods that deal with chemical analysis of raw, compounded and vulcanized rubber, some of which have previously been p
8、ublished in BS 903, BS 1673 and BS 5923. Relevant Parts of those standards will be withdrawn or deleted by amendment, as appropriate, when superseded by Parts and Sections of BS 7164. This British Standard calls for the use of substances that may be injurious to health if adequate precautions are no
9、t taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct ap
10、plication. 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, pages 1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright
11、date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:35:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7164-22.1:1994 BSI 08-19991 1 Scope Th
12、is Section of BS 7164 describes a fusion method for the determination of chlorine. This method is applicable to the determination of total chlorine in neoprene. 2 References 2.1 Normative references This Section of BS 7164 incorporates, by dated or undated reference, provisions from other publicatio
13、ns. These normative references are made at the appropriate places in the text and the cited publications are listed on the inside back cover. For dated references, only the edition cited applies; any subsequent amendments to or revisions of the cited publication apply to this Section of BS 7164 only
14、 when incorporated in the reference by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments. 2.2 Informative references This Section of BS 7164 refers to other publications that provide information or guidance. Editions of t
15、hese publications current at the time of issue of this standard are listed on the inside back cover, but reference should be made to the latest editions. 3 Principle Extraction of a weighed test portion of the rubber with light petroleum or methanol is carried out. The extracted rubber is decomposed
16、 by fusion with sodium peroxide in a Parr bomb. The chlorine is converted to sodium chloride which is determined by titration with silver nitrate. 4 Reagents WARNING. All recognized health and safety precautions should be taken when performing this method of analysis. It is essential that all proced
17、ures should be carried out in a fume cupboard (hood). 4.1 General. Use only reagents of recognized analytical grade and only distilled water conforming to grade 3 of BS 3978:1987 or water of equivalent purity. 4.2 Silver nitrate solution, c(AgNO3) = 0.025 mol/l. 4.3 2, 7- dichlorofluorescein indicat
18、or solution Dissolve 0.2 g 2, 7-dichlorofluorescein in 100 cm3 industrial methylated spirits. 4.4 Nitric acid solution, c(HNO3) = 16 mol/l. 4.5 Dilute nitric acid solution. Dilute one volume of 4.4 with four volumes of water. 4.6 Fusion mixture. Prepare a mixture of 3 parts of sodium peroxide and 1
19、part of sodium carbonate. 4.7 Sucrose 5 Apparatus 5.1 Parr bomb, the design and construction of which shall be such as to resist any pressure likely to occur during the reaction. The Parr bomb apparatus should be complete with a lid, gasket and union, and the metal and gasket shall be resistant to c
20、hemical attack by the reaction mixture. WARNING. A suitable fusion guard should be used during the firing of the bomb. A short metal cylinder, two or three times the diameter of the bomb and about twice the height, is suitable. 5.2 Oven, capable of maintaining a temperature of 100 C. 5.3 Standard la
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