SANS 886-2009 Water quality - Enumeration of micro-organisms in water samples - Guidance on the estimation of variation of results with particular reference to the contribution of .pdf
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1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-22710-4 SANS 886:2009 Edition 1SOUTH AFRICAN NATIONAL STANDARD Water quality Enumeration of micro- organisms in water samples Guidance on
4、the estimation of variation of results with particular reference to the contribution of uncertainty of measurement This national standard is the identical implementation of BS 8496:2007 and is adopted with the permission of British Standards Publishing Ltd. Published by SABS Standards Division 1 Dr
5、Lategan Road Groenkloof Private Bag X191 Pretoria 0001 Tel: +27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS This standard may only be used and printed by approved subscription and freemailing clients of the SABS. SANS 886:2009 Edition 1 Table of changes Change No. Date Scope National forewo
6、rd This South African standard was approved by National Committee SABS SC 147B, Water Biological treatment and assessment of water, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in March 2009. This
7、standard may only be used and printed by approved subscription and freemailing clients of the SABS.BS 8496:2007 Water quality Enumeration of micro-organisms in water samples Guidance on the estimation of variation of results with particular reference to the contribution of uncertainty of measurement
8、 ICS 03.120.30; 07.100.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD SANS 886:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS.Publishing and copyright information The BSI copyright notice display
9、ed in this document indicates when the document was last issued. BSI 2007 ISBN 978 0 580 49930 2 The following BSI references relate to the work on this standard: Committee reference EH/3/4 Publication history First published January 2007 Amendments issued since publication Amd. no. Date Text affect
10、ed BS 8496:2007 SANS 886:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS. BSI 2007 i BS 8496:2007 Contents Foreword ii Introduction 1 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 General 3 5 Procedure 8 Annexes Annex A (in
11、formative) Worked examples 14 Bibliography 18 List of figures Figure 1 Illustration of hypothetical water sample containing 30 micro-organisms distributed at random throughout 10 equal sized sub-samples 7 List of tables Table A.1 Counts on 10 replicate sub-samples from a sample from each of 5 water
12、sources 14 Table A.2 Replicate counts on daily duplicate sub-samples 16 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 19 and a back cover. SANS 886:2009This standard may only be used and printed by approved subscription and freemailing clie
13、nts of the SABS.BS 8496:2007 ii BSI 2007 Foreword Publishing information This British Standard was published by BSI and came into effect on 31 January 2007. It was prepared by Subcommittee EH/3/4, Microbiological methods, under the authority of Technical Committee EH/3, Water quality. A list of orga
14、nizations represented on this committee can be obtained on request to its secretary. Supersession This British Standard supersedes DD 260:2003, which is withdrawn. Relationship with other publications This British Standard gives guidance on the interpretation of the requirements in BS EN ISO/IEC 170
15、25:2005 for estimating uncertainty of measurement, in the context of microbial counts in water samples. It is intended to form an adjunct to BS ISO 8199 which gives guidance on the enumeration of micro-organisms in water samples. Use of this document As a guide, this British Standard takes the form
16、of guidance and recommendations. It should not be quoted as if it were a specification and particular care should be taken to ensure that claims of compliance are not misleading. Any user claiming compliance with this British Standard is expected to be able to justify any course of action that devia
17、tes from its recommendations. Presentational conventions The provisions in this standard are presented in roman (i.e. upright) type. Its recommendations are expressed in sentences in which the principal auxiliary verb is “should”. Commentary, explanation and general informative material is presented
18、 in smaller italic type, and does not constitute a normative element. Contractual and legal considerations This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immu
19、nity from legal obligations. SANS 886:2009This standard may only be used and printed by approved subscription and freemailing clients of the SABS. BSI 2007 1 BS 8496:2007 Introduction BS EN ISO/IEC 17025:2005, 5.4.6.2 specifies that “Testing laboratories shall have and shall apply procedures for est
20、imating uncertainty of measurement”. This is difficult to apply to water microbiology because the distribution and behaviour of microbial cells in water is not uniform. The purpose of the present document is to provide practical guidance on how to interpret and implement these requirements within th
21、e context of a water microbiology laboratory. It is intended to form an adjunct to BS ISO 8199:2005. 1 Scope This British Standard gives guidance on interpretation of the requirements specified in BS EN ISO/IEC 17025:2005 with regard to the uncertainty of measurement in microbial counts in water sam
22、ples. It gives guidance on the estimation of variation in results between replicate sub-samples, which will include that due to uncertainty of measurement, in order to assess whether the variation due to uncertainty of measurement has been controlled in accordance with the requirements specified in
23、BS EN ISO/IEC 17025:2005. It is applicable to examination of sub-samples as part of a quality assurance system. It is applicable to samples of all types of water. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references on
24、ly the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. BS EN ISO/IEC 17025:2005, General requirements for the competence of testing and calibration laboratories DD ENV ISO/TR 13843:2001, Water quality Guidance on valida
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