BS-6068-2.24-1986 ISO-7875-2-1984.pdf
《BS-6068-2.24-1986 ISO-7875-2-1984.pdf》由会员分享,可在线阅读,更多相关《BS-6068-2.24-1986 ISO-7875-2-1984.pdf(14页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS 6068-2.24: 1986 ISO 7875-2: 1984 Water quality Part 2: Physical, chemical and biochemical methods Section 2.24 Method for the determination of non-ionic surfactants using Dragendorff reagent ISO title: Water quality Determination of surfactants Part 2: Determination of non-ionic
2、surfactants using Dragendorff reagent UDC 566:614.777:628.1/.3:663.63:543.257.1:661.185.4 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:28:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.24:1986 This British Standard, having been prepared under the direction of the Environment an
3、d Pollution Standards Committee, was published under the authority of the board of BSI and comes into effect on 31 July 1986 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference EPC/44 Draft for comment 83/54482 DC ISBN 0 580 15159 X Amendments issued sin
4、ce publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:28:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.24:1986 BSI 10-1999i Contents Page National forewordii 0Introduction1 1Scope1 2Field of application1 3References1 4Principle1 5Reagents1 6
5、Apparatus2 7Sampling and samples2 8Procedure2 9Expression of results4 10Interferences4 11Test report4 Annex A Bismuth determination6 Figure Gas-stripping apparatus5 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:28:16 GMT+00:00 2006, Uncontrolled
6、Copy, (c) BSI BS 6068-2.24:1986 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 7875-2:1984 “Water quality Determination of surfactants Part 2: Determinatio
7、n of non-ionic surfactants using Dragendorff reagent”. 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 of discussion in which the
8、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 as follows. Part 0: Introduction; P
9、art 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 suitable for publication as a Bri
10、tish 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. It is current practice in British Standards to use a full point on the baseli
11、ne as the decimal marker. Wherever the words “part of ISO 7875” appear, referring to this standard, they should be read as “Section of BS 6068”. In British Standards it is current practice to use the symbol “L” for litre (and its submultiples) rather than “l”, and to use the spelling “sulphur”, etc.
12、, instead of “sulfur”, etc. NOTETypographical error. In the note to 6.3, lines 2 and 3, “subsequently” should be read as “subsequently”. Cross-references International StandardsCorresponding British Standards BS 6068 Water quality ISO 5667-2:1982Section 6.2:1983 Guidance on sampling techniques (Iden
13、tical) ISO 5667-3:1985aSection 6.3:1986 Guidance on the preservation and handling of samples (Identical) ISO 7875-1:1984Section 2.23:1986 Method for the determination of anionic surfactants by the methylene blue spectrometric method a This Part, referred to in the footnote to clause 3 as being at th
14、e stage of draft, has now been published. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:28:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.24:1986 BSI 10-1999iii Additional information. In the UK it is common practice to use a smaller apparatus than that shown in the Figure, alth
15、ough the diameter of the sintered disc and cylinder is identical, thereby ensuring a similar efficiency of stripping. 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
16、 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 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendme
17、nts incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:28:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:28:16 GMT+00:00 2006, Uncontrolled
18、Copy, (c) BSI BS 6068-2.24:1986 BSI 10-19991 0 Introduction Anionic and non-ionic surface active substances, generally called surfactants, are used in synthetic products for general cleaning purposes. ISO 7875 consists of the following parts: Part 1: Determination of anionic surfactants by the methy
19、lene blue spectrometric method; Part 2: Determination of non-ionic surfactants using Dragendorff reagent. 1 Scope This part of ISO 7875 specifies a method for the determination of non-ionic surfactants in aqueous media using Dragendorff reagent. 2 Field of application This part of ISO 7875 applies t
20、o the determination of low concentrations of bismuth active substances (BiAS), i.e. non-ionic surfactants of the alkylphenol-alkylene oxide and alcohol-alkylene oxide adduct types, as long as they can be stripped and precipitated with Dragendorff reagent (for example ethoxylates with about 5 to 30 e
21、thylene oxide groups per molecule). The method is suitable for influents and effluents of sewage treatment plants and waste water. When investigating surface waters it may be necessary to handle large sample volumes (up to 5 000 ml). The detection limit is 0,05 mg/l for a 1 litre sample and the opti
22、mum range of application is 250 to 800 4g. 3 References ISO 5667, Water quality Sampling Part 2: Guidance on sampling techniques Part 3: Guidance on the preservation and handling of samples1). 4 Principle Air stripping of surfactants from the sample and collection in ethyl acetate. Removal of ethyl
23、acetate and precipitation of the non-ionic surfactants with Dragendorff reagent (KBil4 + BaCl2 + acetic acid). Isolation and dissolution of the precipitate, and potentiometric determination of the concentration of bismuth equivalent to the concentration of non-ionic surfactant with sodium pyrrolidin
24、-1-yl dithiocarboxylate solution. Alternative methods for the determination of the bismuth ion are, among others, atomic absorption and UV spectrometry (see the Annex A). 5 Reagents During the analysis, unless otherwise stated, use only reagents of recognized analytical grade, and only distilled wat
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- BS-6068-2.24-1986 ISO-7875-2-1984 BS 6068 2.24 1986 ISO 7875 1984
链接地址:https://www.31doc.com/p-3772871.html