BS-6068-2.37-1990 ISO-9297-1989.pdf
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1、BRITISH STANDARD BS 6068-2.37: 1990 ISO 9297:1989 Water quality Part 2: Physical, chemical and biochemical methods Section 2.37 Method for the determination of chloride via a silver nitrate titration with chromate indicator (Mohrs method) Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:29:
2、53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.37:1990 This British Standard, having been prepared under the direction of the Environment and Pollution Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 30 September 1990 BSI 04-1999 Th
3、e following BSI references relate to the work on this standard: Committee reference EPC/44 Draft for comment 88/50947 DC ISBN 0 580 18754 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Environment and Pollution Standards Policy Commit
4、tee (EPC/-) to Technical Committee EPC/44, upon which the following bodies were represented: Association of Consulting Scientists British Association for Chemical Specialities British Gas plc Chemical Industries Association Department of the Environment for Northern Ireland Department of the Environ
5、ment (Water Directorate) Department of Trade and Industry (Laboratory of the Government Chemist) Electricity Supply Industry in England and Wales Industrial Water Society Institute of Petroleum Institution of Gas Engineers Institution of Water and Environmental Management National Rivers Authority R
6、oyal Institute of Public Health and Hygiene Royal Society of Chemistry Scottish Association of Directors of Water and Sewerage Services Soap and Detergent Industry Association Water Companies Association Water Research Centre Water Services Association of England and Wales Amendments issued since pu
7、blication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:29:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.37:1990 BSI 04-1999i Contents Page Committees responsibleInside front cover National forewordii 1Scope1 2Normative references1 3Principle1 4Reagents1 5A
8、pparatus2 6Procedure2 7Expression of results2 8Test report3 Table 1 Interferences1 Table 2 Precision data3 Publication(s) referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:29:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.37:1990 ii BSI 04-1999 National
9、foreword This Section of BS 6068, which has been prepared under the direction of the Environment and Pollution Standards Policy Committee, is identical with ISO 9297:1989 “Water quality Determination of chloride Silver nitrate titration with chromate indicator (Mohrs method)”. The International Stan
10、dard was prepared by subcommittee 2, Physical, chemical and biochemical methods, of Technical Committee 147, Water quality, of the International Organization for Standardization (ISO) with the active participation and approval of the UK. NOTEThe tests described in this Section of BS 6068 should only
11、 be carried out in laboratories with suitable facilities and by qualified persons with an appropriate level of chemical expertise. Standard chemical procedures should be followed throughout. BS 6068 is being published in a series of Parts subdivided into Sections that will generally correspond to pa
12、rticular international standards. Sections are being, or will be, published in Parts 1 to 7, which, together with Part 0, are listed below. Part 0: Introduction; Part 1: Glossary; Part 2: Physical, chemical and biochemical methods; Part 3: Radiological methods; Part 4: Microbiological methods; Part
13、5: Biological methods; Part 6: Sampling; Part 7: Precision and accuracy. The Technical Committee has reviewed the provisions of ISO 385-1, which is referred to in the text, and has decided that they are acceptable for use in conjunction with this standard. A related British Standard to ISO 385-1 is
14、BS 846 “Specification for burettes”. Cross-references International standardCorresponding British Standard BS 6068 Water quality ISO 5667-1:1980Section 6.1:1981 Guidance on the design of sampling programmes (Identical) ISO 5667-2:1982Section 6.2:1983 Guidance on sampling techniques (Identical) ISO 5
15、667-3:1985Section 6.3:1986 Guidance on the preservation and handling of samples (Identical) ISO 5725:1986BS 5497 Precision of test methods Part 1:1987 Guide for the determination of repeatability and reproducibility for a standard test method by interlaboratory tests (Identical) Licensed Copy: sheff
16、ieldun sheffieldun, na, Tue Dec 05 01:29:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.37:1990 BSI 04-1999 iii A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance wit
17、h 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 to iv, pages 1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amen
18、dments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:29:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:29:53 GMT+00:00 2006, Uncontroll
19、ed Copy, (c) BSI ISO 9297:1989(E) BSI 04-19991 1 Scope 1.1 Application range This International Standard specifies a titration method for the determination of dissolved chloride in water. The method is applicable to the direct determination of dissolved chloride in concentrations between 5 mg/l and
20、150 mg/l. The working range may be extended to 400 mg/l by using a burette of larger capacity or by sample dilution. Due to many interferences the method is not applicable to heavily polluted waters of low chloride content. 1.2 Interferences Normal concentrations of common constituents of ground wat
21、er, surface water and potable water do not interfere with the determination. The following substances interfere with the method Substances forming insoluble silver compounds, such as bromides, iodides, sulfides, cyanides, hexacyanoferrates(II) and hexacyanoferrates(III). If necessary, bromide and io
22、dide ions shall be determined separately, and the result of the chloride determination corrected accordingly. Compounds forming complexes with silver ions, such as ammonium and thiosulfate ions. Compounds which will reduce chromate ions, including iron(II) and sulfite ions. The interferences mention
23、ed above will lead to high chloride values. Highly coloured or turbid solutions may obscure the end point, for example hydrated iron oxide. Table 1 Interferences Table 1 gives a summary of the concentrations of interfering compounds, in milligrams per litre, that give an increase of approximately 2
24、% in the result when in the presence of 70 mg/l of chloride. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are
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