1、BRITISH STANDARD CONFIRMED AUGUST 1993 BS 576-1:1988 Acetic acid for industrial use Part 1: Specification for acetic acid UDC 66.061:546:547.292:620.1BS576-1:1988 This British Standard, having been prepared under the directionof the Chemicals Standards Committee, was published under the authority of
2、the Board of BSI and comes intoeffect on 29 February 1988 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference CIC/51 Draft for comment 87/52164 DC ISBN 0 580 16499 3 Committees responsible for this British Standard The preparation of this British Standar
3、d was entrusted by the Chemicals Standards Committee (CIC/-) to Technical Committee CIC/51, upon which the following bodies were represented: British Pharmacopoeia Commission British Society of Perfumers Chemical Industries Association Department of Trade and Industry (Laboratory of the Government C
4、hemist) Royal Society of Chemistry Amendments issued since publication Amd. No. Date of issue CommentsBS576-1:1988 BSI 10-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Description 1 3 Sampling and size of sample 1 4 Requirements 1 Table 1 Requirements 1 Publi
5、cations referred to Inside back coverBS576-1:1988 ii BSI 10-1999 Foreword This Part of BS 576, which has been prepared under the direction of the Chemicals Standards Committee, comprises a specification for acetic acid to meet the requirements of a wide range of industrial users. It does not, howeve
6、r, apply to material intended for medicinal use, which is included in the British Pharmacopoeia, or to material for photographic use, which is specified in BS5569. First published in 1934, BS576 was last revised in1969 and is now withdrawn, being superseded by this Part of BS576 together with Part2.
7、 The following changes have been made in this revision of BS576. a) The grade referred to as “technical glacial acetic acid” has been omitted. b) The requirements for residue on evaporation are more stringent for each grade. c) The requirements for crystallizing point, acetic acid content and water
8、content of glacial acetic acid are more stringent. d) The requirements for inorganic chlorides, inorganic sulphates, heavy metals and formic acid content of glacial acetic acid and “80% dilute acetic acid” are more stringent. e) The maximum value for colour of glacial acetic acid and “80 % dilute ac
9、etic acid” is now15Hazen units instead of10Hazen units. f) The methods of test which were appended to BS576:1969 are now published as Part2. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct applica
10、tion. 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, pagesi andii, pages1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) an
11、d may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS576-1:1988 BSI 10-1999 1 1 Scope This Part of BS 576 specifies requirements for three grades of acetic acid suitable for industrial use. It does not apply to material for medicinal use o
12、r to material for photographic use. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Description At ambient temperatures above the crystallizing point, the material shall be a liquid which is clear and free from matter in suspension, other than a
13、 slight opalescence resulting from storage in aluminium or wax-lined containers, as assessed by visual inspection. It shall consist essentially of acetic acid, CH 3 COOH. 3 Sampling and size of sample A sample of not less than1L shall be taken in accordance with BS576-2. 4 Requirements The material
14、shall comply with the requirements given inTable 1, when tested by the appropriate method as indicated in the final column. Table 1 Requirements Property Grade Method of test Glacial acetic acid 80% dilute acetic acid 80% dilute technical acetic acid Colour, Hazen units, maximum 15 15 40 BS 5339 Cry
15、stallizing point, C, minimum 15.6 a a BS 576-2 (byreferencetoBS 4633) Acetic acid content, % (m/m): minimum maximum 99.5 a 79.5 80.5 79.5 80.5 BS 576-2 Residue on evaporation, % (m/m), maximum 0.005 0.005 0.01 BS 4524 Iron content, % (m/m), maximum 0.0002 0.0002 a BS 576-2 (byreferenceto BS 6337-3)
16、Inorganic chlorides, % (m/m) of Cl , maximum 0.0003 0.0003 0.002 BS 576-2 Inorganic sulphates, % (m/m) of SO, maximum 0.0002 0.0002 0.002 BS 576-2 Heavy metals (including iron), as%(m/m) of Pb, maximum 0.0003 0.0003 0.002 BS 576-2 Formic acid content, % (m/m), maximum 0.10 0.10 0.35 BS 576-2 Acetald
17、ehyde monomer content, %(m/m), maximum 0.05 0.05 0.15 BS 576-2 Water content, % (m/m), maximum 0.35 a a BS 2511 a Not specified. 2 42 blankBS576-1:1988 BSI 10-1999 Publications referred to BS 576, Acetic acid for industrial use. BS 576-2, Methods of test for acetic acid. BS 2511, Methods for the det
18、ermination of water (Karl Fischer method). BS 4524, Method for determination of residue on evaporation on a water bath. BS 4633, Method for the determination of crystallizing point. BS 5339, Method of measurement of colour in Hazen units (platinum-cobalt scale) of liquid chemical products. BS 5569,
19、Specification for photographic grade glacial acetic acid 1) . BS 6337, General methods of chemical analysis. BS 6337-3, Method for determination of iron content (1,10-phenanthroline spectrophotometric method). 1) Referred to in the foreword only.BS 576-1:1988 BSI 389 Chiswick High Road London W4 4AL
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