1、CEN EN*IS0*3696 95 3404589 0307762 T82 = t - BRITISH STANDARD water for analytical laboratory use - Specification and test methods L The European Standard EN IS0 3696 : 1995 has the status of a British Standard BS EN IS0 3696 : 1995 CEN EN*ISO*3696 95 3404589 0307763 919 M . BS 3978 : 1987 Contents
2、National foreword Committees responsible Specification 1 Scope and field of application 2 Descriqion 3 Classification 4 Requirements Page Inside front cover 5 Sampling Back cover 6 Storage 7 Methods of test 8 Test reports 1 1 Table 1 Requirements 1 Page 2 2 2 5 2 National foreword This British Stand
3、ard has been prepared under the direction of the Chemicals Standards Committee. It is identical with IS0 3696 : 1987 Water for analytical laboratory use - Specification and test methods, published by the International Organization for Standardization (ISO). In- 1995 the European Committee for Standa
4、rdization (CEN) accepted IS0 3696 : 1987 as European Standard EN IS0 3696. As a consequence of implementing the European Standard this British Standard is renumbered as BS EN IS0 3696 and any reference to BS 3978 should be read as a reference to BS EN Is0 3696. This standard IS a rewntc;u IS wiLnara
5、wn. I he principal changes ;-.this edition.are as tiiows. (a) The single grade of water has been replaced by three grades, of which grade 3 is roughly Equivalent to the water specified in the previous edition. (b) Residue on ignition is no longer specified and the requirement (for grade 3 water) for
6、 residue on evaporation has been tightened. (c) Electrical conductivity is now measured at 25 “C instead of 20 OC, and the requirement for grade 3 water has been changed from 1 mS/m to 0.5 mS/m. (d) The limit for oxidizable matter for grade 3 water has been tightened. (e) Requirements for ammonia co
7、ntent, chloride content and sulphate content are no longer included. 99.9 % of Cio7), previously dried at 110 OC, into the 7.6.2.2 Matched Nessler cylinders, of capacity 50 ml. platinum dish (7.5.2.3)- dd 4,s g of sodium carbonate * (anhydrous Na,CO,) and intimately mix the sample with a dry, smooth
8、-ended glass rod. Ease the mixture into the centre of the dish and flatten it so that it covers an area 0.5 g of the sodium carbonate, then gently brush any 7.6.2.3 Muffle 4oo oc. capable of being at 3oo to 30 mm in diameter. cover the mixture with a further 7.6.2.4 Water-bath. capable of being Cont
9、rolled at approx- imately 60 OC. particles adhering to the glass rod into the dish. Cover the dish with a platinum lid and place in the muffle fur- nace (7.6.2.31. controlled at 300 to 400 OC. Heat the mixture, gradually raising the temperature for about 10 min or until fusion is complete. Remove th
10、e dish from the furnace and gently swirl it to incorporate any particles. Allow to cool, wash into the dish any particles adhering to the underside of the lid with hot water, then dissolve the fused mass in hot water. Cool, transfer the solution quantitatively to a 1 o00 ml one- mark volumetric flas
11、k, dilute to the mark and mix. Transfer the solution to the plastics bottle for storage. 1 ml of this standard solution contains 1 mg of 50,. 7.6.3 Procedure 7.6.3.1 Test portion Take 520 ml of grade 1 water or 270 ml of grade 2 water. 7.6.3.2 Test Evaporate the test portion (7.6.3.1 1 in the dish (
12、7.6.2.1) in suc- cessive portions, to produce a final volume of 20 ml. Add 1 ml of the ammonium molybdate solution (7.6.1.31. After exactly 5 min, add 1 ml of the oxalic acid solution (7.6.1.6) and mix well. After 1 min, add 1 ml of the metol solution (7.6.1.41, and See national foreword for details
13、 of textual errors. 4 CEN EN*IS0*3696 95 = 3404589 0307770 059 BS 3978 : 1987 heat for 10 min in the water bath (7.6241, maintained at ap- proximately 60 OC. Transfer the solution to one of the matched Nessler cylinders (7.6.2.2). Prepare a standard colour solution following the same pro- cedure, bu
14、t using a mixture of 19.0 ml of the sample and 1.0 rnl of the standard silica solution (7.6.1.2) instead of the 20 ml resulting from the evaporation of the test portion (7.6.3.1 ). Transfep the solution to the other matched Nessler cylinder (7.6.2.2). kS, Viewing vertically downwards, check that the
15、 intensity of any blue colour produced in the test solution does not exceed that produced in the standard colour solution 8 Test reports Each test report shall include the following particulars : al an identification of the sample; b) the reference of the method used: e) the results and the methad b
16、f expression used; di any unusual features noted during the determination; e) dard, or regarded as optional. any operation not included in this International Stan- 5 CEN EN*IS0*3bb 95 = 3404569 0107771 T95 Amd. No. -? - This British Standard, having been prepared under the direction of the Chemicals
17、 Standards Committee, was published under the authority of the Board of BSI and comes into effect on 31 December 1987. O British Standards Institution, 1987 First published February 1966 First revisioryDecember 1987 ISBN O 580 16312 1 The following BSI references relate to the work on this standard:
18、 Committee reference CIC/26 Draft for comment 83/55146 DC Date of issue 3 E? +I- 1-5- 9 .- 4 British Standards Institution. Incorporated by Royal Charter, BSI is the independent national body for the preparation of British Standards. It is the UK member of the International Organization for Standard
19、ization and UK sponsor of the British National Committee of the International Electrotechnical Commission. In addition to the preparation and promulgation of standards, BSI offers specialist services including the provision of information through the BSI Library and Standardline Database; Technical
20、Help to Exporters; and other services. Advice can be obtained from the Enquiry Section, BSI, Milton Keynes MK14 6LE. telephone 0908 221 166, telex 825777. Copyright. Users of British Standards are reminded that copyright subsists in ali BSI publications. No part of this publication may be reproduced
21、 in any form without the prior permission in writing of BS 3978: 1987 IS0 3696 : 1987 Xi This does not preclude the free use, in the course of implenienting the standard, of necessary details such as symbols and size, type or grade designations Enquiries should be addressed to the Publications Manag
22、er, BSI, Linford Wood, Milton Keynes XiK14 6LE. The number for telephone enquiries is 0908 220022 and for telex 825777 Cantract requirements. A British Standard does.pot purport to include all the necessary provisions of a contract Users of British erandards are responsible for their correct applica
23、tion Revision of British Standards. British Standards are revised, when necessary, by the issue either of amendments or of revised editions. It is important that users of British Standards should ascertain that they are in possession of the latest amendments or editions. Automatic updating service.
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25、available to subscribing members of BSI and gives details of new publications, revisions, amendments and withdrawn standards. Any person who. when making use of a British Standard, encounters an inaccuracy or ambiguity, is requested to notify BSI without delay in order that the matter may be investi
26、gated and appropriate action taken. Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Chemicals Standards Committee (CiC/-) to Technical Committee CIC/26, upon which the following bodies were represented: British Pharmacopoeia Commission C
27、hemical Industries Association Institute of Petroleum Milk Marketing Board Royal Society of Chemistry Society of Glass Technology Textile Institute The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Ceramic Research Association Briti
28、sh Effluent and Water Association Standardization of Tar Products Tests Committee ,$*A British Standards Institution . 2 Park Street London W1A 2BS - Telephone 01-629 9000 . Telex 266933 87 12-3-1.8k-B CI Cl26 I CEN EN*ISO*3676 75 3404589 0307772 723 BRITISH STANDARD Water for analytical Specificati
29、on and test methods ldboratory use - s. The European Standard EN IS0 3696 : 1995 has the status of a British Standard BS EN IS0 3696 : 1995 CEN EN*IS0*3696 95 W 3404589 0307773 b8 = . aTANDrn n EUROPl3“E EUROP&CHE NORM EN IS0 3696 April 1995 ICs 71.040.30 Descnptors Inorganic chenustry, chemical ana
30、lysis, chemical reagents, water, classification, specification, tests, storage -. 4 -Lb English version Water for analytical laboratory use- Specification and test methods (IS0 3696 : 1987) Eau pour laboratoire usage andytique- Spcification et mthodes dessai (IS0 3696 : 1987) Wasser fr analytische L
31、aborzwecke- Spezifikation und Pnifverfahren (IS0 3696 : 1987) This European Standard was approved by CEN on 1995-02-13. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without
32、 any alteration. Up-to-date lists and bibiiographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made
33、 by translation under the responsibility of a CEN member into its own language and notified to the Centrai Secretariat has the same status as the officiai versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finiand, Rance, Germany, Greece, Iceland, Ireland, Italy, L
34、uxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fur Normung Centrai Secretariat: rue de Stassart 36, B-1050 Brussels O 1995 AU rights of reproduction and communicati
35、on in any form and by any means reserved in ail countries to CEN and its members Ref. No. EX IS0 3696 : 1995 E CEN EN*IS0*3bSb 95 = 3404589 0307774 7T4 = Page 2 EN IS0 3696 : 1995 Foreword The text of the international standard has been taken as a European Standard by the Technical Committee CENT 19
36、, Petroleum products, lubricants, and related International Organization for Standardization (ISO). Thic European Standard shall be given the status of a nationai standard, either by publication of an identical text or by endorsement, at the btest by October 1995, and conflicting national standards
37、shall be withdrawn at the latest by October 1995. According to the CENKENELEC Internai Regulations, the foliowing countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal,
38、Spain, Sweden, Switzerland and United Kingdom. 2- products, from ISORC 47, Chemistry, of the i I I CEN EN*IS0*3bSb 95 3404589 0307775 630 -I) n-= U- WU= AMD 8807 Amendment No. 1 published and effective from 15 September 1995 to BS 3978 : 1987 (IS0 3696 : 1987) Sflcification for water for laboratory
39、use $4 NOTE. The European Committee for Standardization (CEN) has accepted 1S0 3696 : 1987 as a European Standard designated as EN IS0 3696 : 1995. This amendment implements EN IS0 3693 : 1995 as a British Standard in the BS EN IS0 series. Implementation of European Standard hont cover Delete the co
40、ver page and substitute the attached new- cover page. AMD 8807/September 1995 . _-_- National foreword At the end of paragraph 1, insert the following new paragraph. In 1995 the European Comuttee for Standardization (CEN) accepted IS0 3G96 : 1987 as European Standard EN IS0 3G9G. As a consequence of
41、 implementing the European Standard this British Standard is renumbered as BS ES IS0 3696 and any reference to BS 3978 shoirld be read as a reference to BS EN IS0 3596. AMD 8807/September 1995 _-_-_-_-_-_-_-_- New EN titie page and foreword Inmediateiy after the national foreword insert the attached new EN title page and foreword page. AMD SSO7/September 1995 -_-_-_-_-
