BS-6068-2.19-1986 ISO-6703-3-1984.pdf
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1、BRITISH STANDARD BS 6068-2.19: 1986 ISO 6703-3: 1984 Water quality Part 2: Physical, chemical and biochemical methods Section 2.19 Method for determination of cyanogen chloride ISO title: Water quality Determination of cyanide Part 3: Determination of cyanogen chloride UDC 556.11 + 614.777 + 628.1/.
2、3 + 663.63:53/54 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:28:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.19:1986 This British Standard, having been prepared under the direction of the Environment and Pollution Standards Committee, was published under the authority of the
3、 Board of BSI and comes into effect on 28 February 1986 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference EPC/44 Draft for comment 82/56063 DC ISBN 0 580 14989 7 Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffield
4、un sheffieldun, na, Tue Dec 05 01:28:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.19:1986 BSI 10-1999i Contents Page National forewordii 0Introduction1 1Scope and field of application1 2Definition1 3Principle1 4Reagents1 5Apparatus2 6Sampling and samples2 7Procedure2 8Expression of result
5、s6 9Precision6 10Test report6 Figure 1 Three-necked distillation flask3 Figure 2 Absorption vessel4 Figure 3 Separating funnel5 Figure 4 10 ml sampling funnel5 Figure 5 1 ml sampling funnel5 Table Interferences1 Bibliography7 Publication referred toInside back cover Licensed Copy: sheffieldun sheffi
6、eldun, na, Tue Dec 05 01:28:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.19:1986 ii BSI 10-1999 National foreword This Section of this British Standard, which has been prepared under the direction of the Environment and Pollution Standards Committee, is identical with ISO 6703-3:1984 “Wat
7、er quality Determination of cyanide Part 3: Determination of cyanogen chloride”. The International Standard was prepared by subcommittee 2, Physical, chemical and biochemical methods, of Technical Committee 147, Water quality, of the International Organization for Standardization (ISO) as a result o
8、f discussion in which the UK participated. This British Standard is being published 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 6, which, together with Part 0, are listed b
9、elow. Part 0: Introduction; Part 1: Glossary; Part 2: Physical, chemical and biochemical methods; Part 3: Radiological methods; Part 4: Microbiological methods; Part 5: Biological methods; Part 6: Sampling. Terminology and conventions. The text of the International Standard has been approved as suit
10、able for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to u
11、se a full point on the baseline as the decimal marker. Wherever the words “International Standard” or “part of ISO 6703” appear, referring to this standard, they should be read as “British Standard” or “Section of BS 6068” respectively. In British Standards it is current practice to use the symbol “
12、L” for litre (and its submultiples) rather than “l” and to use the spelling “sulphur”, etc., instead of “sulfur”, etc. ISO 6703-1:1984 and ISO 6703-2:1984 are referred to in clause 0 for information only. Accordingly, the validity of this standard is not affected. British Standards related to ISO 67
13、03-1 and ISO 6703-2 are BS 6068-2.17 and BS 6068-2.18 respectively. Textual errors. When adopting the text of the International Standard, the following textual errors were discovered. They have been marked in the text and have been reported to ISO in a proposal to amend the text of the International
14、 Standard. a) In clause 6, the beginning of paragraph 4 should read as follows “Transfer the collected sample to the separating funnel (5.3) as follows. Rinse the outside of the sampling funnel (5.4 or 5.5) with water and place it on .”. b) In 7.1, the end of the first sentence should read “ into th
15、e vessel above the fritted glass”. Cross-references International Standard Corresponding British Standard BS 6068 Water quality: Part 2 Physical, chemical and biochemical methods ISO 6703-4:1985aSection 2.20:1986 Method for determination of cyanide by diffusion at pH6 (Identical) a Referred to in th
16、e text as at the stage of draft. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:28:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.19:1986 BSI 10-1999iii c) In 7.1, paragraph 2, the second and third sentences should read as follows “Place the separating funnel (5.3) in one side ne
17、ck with the open-topped funnel in the second side neck. Pour 10 ml of the buffer solution (4.9) into the flask via the open-topped funnel.” d) In clause 10 d) line 2, delete “sections 1 and 3 of”. Additional information a) Air bubbles through the buffered sample in the flask when the stopcock of the
18、 separating funnel is closed in 7.1, paragraph 3. b) With respect to 7.1, paragraph 4, to be comparable with the standard matching solutions, it is necessary to transfer the contents of the absorption vessel to a one-mark volumetric flask of 25,0 ml capacity. c) The standard matching solutions prepa
19、red in 7.4.1 contain 0,0008; 0,002; 0,008 and 0,010 of cyanide, in milligrams, respectively. d) Experience may show that the checking of new batches of chemicals referred to in 7.4.3 may be particularly necessary with respect to new batches of barbituric acid. A British Standard does not purport to
20、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 confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, p
21、ages i to iv, pages 1 to 8, 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. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:28:12 GM
22、T+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:28:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.19:1986 BSI 10-19991 Attention is drawn to the toxicity of cyanide and to the need to take extreme care when handling cyanides and th
23、eir solutions. Carry out all operations in a fume cupboard. Avoid contact with the skin and eyes. When pipetting, always use a safety pipette (pipette by bulb). Detoxify samples and solutions containing cyanides or heavy metals in accordance with local official regulations. Other chemicals specified
24、 in this part of ISO 6703 are also hazardous, for example pyridine. 0 Introduction Cyanides may be present in water as hydrocyanic acid (prussic acid), as cyanide ions and as complex cyanides. They may be determined as total cyanide or as easily liberatable cyanide. If cyanide compounds are chlorina
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