Bsi bs en 12918 1999 (2008) bs 6068 2 67 1999

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This British Standard, having

been prepared under the

direction of the Health and

Environment Sector Committee,

was published under the

authority of the Standards

Committee and comes into effect

on 15 December 1999

 BSI 12-1999

ISBN 0 580 35104 1

Amendments issued since publication

National foreword

This British Standard is the English language version of EN 12918:1999

The UK participation in its preparation was entrusted by Technical Committee EH/3,Water quality, to Subcommittee EH/3/2, Physical, chemical & biochemical methods,which has the responsibility to:

Ð aid enquirers to understand the text;

Ð present to the responsible European committee any enquiries on theinterpretation, or proposals for change, and keep the UK interests informed;

Ð monitor related international and European developments and promulgatethem in the UK

A list of organizations represented on this subcommittee can be obtained on request

to its secretary

BS EN 12918 is one of a series of standards on water quality, others of which havebeen, or will be, published as Sections of BS 6068 This standard has therefore beengiven the secondary identifier BS 6068-2.67 The various Sections of BS 6068 arecomprised within Parts 1 to 7, which, together with Part 0, are listed below

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

Part 7 Precision and accuracy

NOTE The tests described in this British Standard should only be carried out by suitably qualified persons with an appropriate level of chemical expertise Standard chemical procedures should be followed throughout.

Cross-references

The British Standards which implement international or European publicationsreferred to in this document may be found in the BSI Standards Catalogue under thesection entitled ªInternational Standards Correspondence Indexº, or by using theªFindº facility of the BSI Standards Electronic Catalogue

A British Standard does not purport to include all the necessary provisions of acontract Users of British Standards are responsible for their correct application

Compliance with a British Standard does not of itself confer immunity from legal obligations.

There are three possible calibration methods that are allowable:

(6)

(7)

(8)

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