1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 13342:2000 The Euro
2、pean Standard EN 13342:2000 has the status of a British Standard ICS 13.030.20 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Characterization of sludges Determination of Kjeldahl nitrogenThis British Standard, having been prepared under the direction of the Health and Enviro
3、nment Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 October 2000 BSI 10-2000 ISBN 0 580 36290 6 BS EN 13342:2000 Amendments issued since publication Amd. No. Date Comments National foreword This British Standard is the official English lan
4、guage version of EN 13342:2000. The UK participation in its preparation was entrusted to Technical Committee EH/5, Sludge characterization, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or pro
5、posals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Further information Users of this standard are informed tha
6、t the UK submitted some substantial comments at the final voting stage of the draft EN for the following reasons. 1) In annex A, it is essential that the description of the four samples used in the inter-laboratory comparison is given. This can be achieved by the addition of a simple footnote. It is
7、 recommended that this topic is discussed at the TC308 meeting in Utrecht. A documented minimum requirement for inter-laboratory comparisons is needed. 2) The following note should be added to the scope: “The validation for this standard has only been carried out using materials as described in anne
8、x A. For other sludges, the user should validate the method using recovery and reproducibility tests”. 3) The date that the laboratory inter-comparison was carried out should be also given. 4) The final phrase “and sludge products”, in the first sentence of the scope should be removed as it is inapp
9、ropriate. 5) In 5.1, suggest replacing the first sentence, “The digestion fails to determine nitrogen in the form ”, with “The digestion may fail to fully recover nitrogen in the form of ”. Also suggest that a cross-reference to the UK Blue Book method be made. This has a useful introductory histori
10、cal section (A1) on recoveries of “difficult” nitrogen species using the Kjeldahl method. Kjeldahl Nitrogen in Waters 1987, HMSO 1988, ISBN 0 11 752129 9 6) In annex A: (i) CV R , in column 6, should be CV r in all three language versions: (ii) all of the English and German coefficients of variation
11、 of both reproducibility (CV R ) and repeatability (CV r ) are wrongly calculated. The values are wrong by up to a factor three, which is to high.BS EN 13342:2000 BSI 10-2000 i 7) In the section on Analytical Quality Control (AQC), it is recommended that an additional brief section be added on the u
12、se of adequate AQC as per CEN/TC223 methods: “The analysis described in this standard should be carried out within a Quality Control system utilizing Analytical Quality Control measures. Where perfomance data is absent for the sample type, at a minimum recovery and reproducibility data should be obt
13、ained”. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standar
14、ds Electronic Catalogue. 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 British Standard does not of itself confer immunity from legal obligations. Summary of pages
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