BS-6068-2.48-1995 ISO-10359-2-1994.pdf
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1、BRITISH STANDARD BS 6068-2.48: 1995 ISO 10359-2: 1994 Water quality Part 2: Physical, chemical and biochemical methods Section 2.48 Determination of inorganically bound total fluoride after digestion and distillation Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:30:42 GMT+00:00 2006, Unc
2、ontrolled Copy, (c) BSI BS 6068-2.48:1995 This British Standard, having been prepared under the direction of the Health and Environment Sector Board, was published under the authority of the Standards Board and comes into effect on 15 April 1995 BSI 07-1999 The following BSI references relate to the
3、 work on this standard: Committee reference EPC/44 Draft for comment 92/58404 DC ISBN 0 580 23959 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee EPC/44, Water quality, upon which the following bodies were represented:
4、Association of Consulting Scientists British Association for Chemical Specialists British Gas plc Chemical Industries Association Convention of Scottish Local Authorities Department of the Environment (Water Directorate) Department of the Environment for Northern Ireland Department of Trade and Indu
5、stry (Laboratory of the Government Chemist) Electricity Association Industrial Water Society Institute of Gas Engineers Institution of Water Officers Institution of Water and Environmental Management National Rivers Authority Royal Institute of Public Health and Hygiene Royal Society of Chemistry Sc
6、ottish 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 The following bodies were also represented in the drafting of the standard, through subcommittees a
7、nd panels: The Association of the Laboratory Supply Industry British Agrochemicals Association Ltd. British Ceramic Research British Soft Drinks Association Ltd. GAMBICA (BEAMA) Ltd. Society of Chemical Industry Swimming Pool and Allied Trades Association Ltd. Amendments issued since publication Amd
8、. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:30:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.48:1995 BSI 07-1999i Contents Page Committees responsible Inside front cover National foreword ii Introduction 1 1Scope1 2Normative reference1 3Principle1 4Reagents1
9、 5Apparatus2 6Sampling and samples2 7Procedure2 8Calculation5 9Precision5 10Test report5 Annex A (informative) Bibliography6 Figure 1 Example of a distillation apparatus3 Table 1 Preparation of reference solutions4 Table 2 Precision data5 List of references Inside back cover Licensed Copy: sheffield
10、un sheffieldun, na, Tue Dec 05 01:30:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.48:1995 ii BSI 07-1999 National foreword This Section of BS 6068 has been prepared by Technical Committee EPC/44, and is identical with ISO 10359-2:1994 Water quality Determination of fluoride Part 2: Determ
11、ination of inorganically bound total fluoride after digestion and distillation. The international standard was prepared by Technical Committee 147, Water quality, of the International Organization for Standardization (ISO) with the active participation and approval of the UK. BS 6068 is being publis
12、hed in a series of Parts subdivided into Sections that will generally correspond to particular 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 bio
13、chemical methods; Part 3: Radiological methods; Part 4: Microbiological methods; Part 5: Biological methods; Part 6: Sampling; Part 7: Precision and accuracy; NOTEThe tests described in this Section of BS 6068 should only be carried out by suitably qualified persons with an appropriate level of biol
14、ogical expertise. Standard chemical procedures should be followed throughout. 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 with a British Standard does not of itself con
15、fer immunity from legal obligations. Cross-reference International standardCorresponding British Standard ISO 5667-3:1994BS 6068 Water quality Section 6.3:1986 Guidance on the preservation and handling of samplesa a In preparation. The 1986 edition was identical with ISO 5667-3:1985. Summary of page
16、s This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 6, an inside back cover and a back cover. This 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.
17、Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:30:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 10359-2:1994(E) BSI 07-19991 Introduction Fluoride ions occur in almost all ground and surface waters. Their concentration depends primarily on the hydrogeological conditions and is general
18、ly below 1 mg/l. Certain industrial waste waters may also contain fluoride ions in higher concentrations. The fluoride concentration is also dependant on the type and concentration of cations present at the same time in water, such as Ca2+, Mg2+, Al3+ or Fe3+, which may form sparingly soluble compou
19、nds with fluoride ions or complexes of low dissociation grade. In addition, stable boron-fluoride complexes exist. Several different methods are available for determining fluoride and the choice of method depends on the type of problem posed as follows. a) Direct measurement using fluoride ion selec
20、tive electrodes. This method is suitable for the determination of fluoride in drinking and surface water. It is included in ISO 10359-1. b) Determination of inorganically bound total fluoride using decomposition, distillation and potentiometric measurement. This method is included in this part of IS
21、O 10359. 1 Scope 1.1 Field of application This part of ISO 10359 specifies a method for the determination of inorganically bound total fluoride. The method is applicable to waste waters which are highly contaminated inorganically, with a fluoride ion concentration of more than 0,2 mg/l. 1.2 Interfer
22、ences Interferences caused by certain cations (see introduction) or boron, which may occur in the determination of fluoride, need to be eliminated by distillation. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this pa
23、rt of ISO 10359. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this part of ISO 10359 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of
24、 IEC and ISO maintain registers of currently valid International Standards. ISO 5667-3:1994, Water quality Sampling Part 3: Guidance on the preservation and handling of samples. 3 Principle Evaporation of the water sample to dryness in an alkaline medium. Fusing of the residue with sodium hydroxide.
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