BS-6068-2.8-1984 ISO-6058-1984.pdf
《BS-6068-2.8-1984 ISO-6058-1984.pdf》由会员分享,可在线阅读,更多相关《BS-6068-2.8-1984 ISO-6058-1984.pdf(12页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS 6068-2.8: 1984 ISO 6058:1984 Water quality Part 2: Physical, chemical and biochemical methods Section 2.8 Determination of calcium content: EDTA titrimetric method ISO title: Water quality Determination of calcium content EDTA titrimetric method UDC 556:614.777:628.1/.3:663.63:54
2、3.24:546.41 Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:28:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.8:1984 This British Standard, having been prepared under the direction of the Environment and Pollution Standards Committee, was published under the authority of the Board
3、 of BSI and comes into effect on 31 December 1984 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference EPC/44 Draft for comment 83/50597 DC ISBN 0 580 14198 5 Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun she
4、ffieldun, na, Tue Dec 05 01:28:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.8:1984 BSI 10-1999i Contents Page National forewordii 1cope and field of application1 2References1 3Principle1 4Reagents1 5Apparatus2 6Sampling and samples2 7Procedure2 8Expression of results2 9Precision2 10Interf
5、erences2 11Test report3 Bibliography4 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:28:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.8:1984 ii BSI 10-1999 National foreword This Section of this British Standard, which has been prepared
6、under the direction of the Environment and Pollution Standards Committee, is identical with ISO 6058:1984 “Water quality Determination of calcium content EDTA titrimetric method”. The International Standard was prepared by subcommittee 2, Physical, chemical and biochemical methods, of Technical Comm
7、ittee 147, Water quality, of the International Organization for Standardization (ISO) as a result of 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. S
8、ections are being, or will be, published in Parts 1 to 6 which, together with Part 0, are as follows. 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: Samplin
9、g. Terminology and conventions. The text of the International Standard has been approved as suitable 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 followin
10、g. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. It is current practice in
11、British Standards for the symbol “L” to be used for litre rather than “l” and for the term “sulphur” to be used rather than “sulfur”. The following ISO standard (at present in course of preparation), which is referred to in clause 2, is essentially of an advisory nature and the absence of correspond
12、ing British Standards does not affect the validity of this standard. However, it is intended that this International Standard will be published as a Section of this British Standard and the anticipated title has been included for information only. Cross-references International StandardsCorrespondin
13、g British Standards ISO 5667 Part 1:1980 BS 6068 Water quality Part 6 Sampling Section 6.1:1981 Guidance on the design of sampling programmes (Identical) Part 2:1982Section 6.2:1983 Guidance on sampling techniques (Identical) International StandardCorresponding British Standard ISO 5667-3BS 6068 Wat
14、er quality Section 6.3 Guidance on the preservation and handling of samples Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:28:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.8:1984 BSI 10-1999iii The Technical Committee has reviewed the provisions of ISO 385-1 (at present in the c
15、ourse of preparation) to which reference is made in clauses 2 and 5, and has decided that burettes specified to BS 846:1980, 25 mL nominal capacity, smallest scale interval 0.05 mL, Class A, are suitable. A British Standard does not purport to include all the necessary provisions of a contract. User
16、s 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, pages i to iv, pages 1 to 4, an inside back cover and a b
17、ack 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 01:28:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licens
18、ed Copy: sheffieldun sheffieldun, na, Tue Dec 05 01:28:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6068-2.8:1984 BSI 10-19991 1 Scope and field of application This International Standard specifies a titrimetric method using ethylenediaminetetraacetic acid (EDTA) for the determination of the cal
19、cium content of ground waters, surface waters and drinking waters. It can also be used for municipal and industrial raw waters, provided they do not contain interfering amounts of heavy metals. The method is not applicable to sea waters and other similar waters with a high concentration of salts. It
20、 is applicable to waters with calcium contents ranging from 2 to 100 mg/l (0,05 to 2,5 mmol/l). For waters containing more calcium than 100 mg/l, a diluted sample shall be used. 2 References ISO 385-1, Laboratory glassware Burettes Part 1: General requirements1). ISO 5667, Water quality Sampling Par
21、t 1: Guidance on the design of sampling programmes Part 2: Guidance on sampling techniques Part 3: Guidance on the preservation and handling of samples2). 3 Principle Complexometric titration of calcium ions with an aqueous solution of the disodium salt of EDTA at a pH value of between 12 and 13. HS
22、N, which forms a red complex with calcium, is used as the indicator. Magnesium is precipitated as the hydroxide and does not interfere with the determination. In the titration, the EDTA first reacts with the free calcium ions and then with the calcium ions combined with the indicator. The indicator
23、then changes its colour from red to bright blue. 4 Reagents During the analysis, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity. 4.1 Sodium hydroxide, 2 mol/l, solution. Dissolve 8 g of sodium hydroxide in 100 ml of freshly distilled water. St
24、ore in a polyethylene bottle. NOTETake precautions to avoid contamination by atmospheric carbon dioxide. 4.2 EDTA, standard volumetric solution, c(Na2EDTA) . 10 mmol/l. 4.2.1 Preparation Dry a portion of the disodium salt of EDTA dihydrate (C10H14N2O8Na22H2O) at 80 C for 2 h, dissolve 3,725 g of the
- 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-6068-2.8-1984 ISO-6058-1984 BS 6068 2.8 1984 ISO 6058
链接地址:https://www.31doc.com/p-3772424.html