&nbsp
International Customer Service
Phone +49 30 2601-2759
Fax +49 30 2601-1263

Standard 2014-06

DIN EN ISO 17994:2014-06

Water quality - Requirements for the comparison of the relative recovery of microorganisms by two quantitative methods (ISO 17994:2014); German version EN ISO 17994:2014

German title
Wasserbeschaffenheit - Anforderungen für den Vergleich der relativen Wiederfindung von Mikroorganismen durch zwei quantitative Verfahren (ISO 17994:2014); Deutsche Fassung EN ISO 17994:2014
Publication date
2014-06
Original language
German

Please select

from 88.00 EUR VAT included

from 82.24 EUR VAT excluded

Purchasing options

PDF download
  • 88.00 EUR

  • 110.20 EUR

Shipment
  • 106.50 EUR

  • 133.10 EUR

Subscription 1
Publication date
2014-06
Original language
German
DOI
https://dx.doi.org/10.31030/2066736

Quick delivery via download or delivery service

Buy securely with a credit card or pay upon receipt of invoice 

All transactions are encrypted

Overview

This International Standard specifies criteria and procedures for comparing the average quantitative results obtained by two microbiological analytical methods, one of which may, but need not, be a standard or reference method. The methods considered are based on counts of colonies or of positive and negative liquid enrichment tubes (MPN, most probable number). It specifies an evaluation procedure for comparing two methods intended for the detection or quantification of the same target group or species of microorganisms. This International Standard provides the mathematical basis for the evaluation of the average relative performance of two quantitative methods against chosen criteria for the comparison. The document does not provide data for assessment of the precision of the methods being compared. The precision of methods should be assessed as part of their performance characterization. This International Standard does not provide methods for the verification of method performance characterization in a single laboratory. The decision rules are described according to these two methods are considered as "not different". The most important basic requirement of comparison studies is a wide range of samples. Participation by a number of laboratories is usually necessary, allowing the expansion of the sample range over large geographical areas. Also the credibility of a general conclusion is commonly believed to require the participation of several laboratories. The result of the comparison is generally valid only within the range of sample types studied. Advice on the conduct of comparison studies is given. It is important to note that the principles of operation of the two methods being compared should be well understood and that the significance of any differences in the methods on the outcome of the comparative assessment should be recognized. This is particularly important if the confirmed results from each method are based on different principles. This document (EN ISO 17994:2014) has been prepared by Technical Committee ISO/TC 147 "Water quality" in collaboration with Technical Committee CEN/TC 230 "Water analysis" the secretariat of which is held by DIN. The responsible German body involved in its preparation is Subcommittee NA 119-01-03-03 "Mikrobiologie" ("Microbiology") of Working Committee NA 119-01-03 AA "Wasseruntersuchung (CEN/TC 230, ISO/TC 147)" ("Water examination (CEN/TC 230, ISO/TC 147)") at DIN Standards Committee Water Practice (NAW).

Content
DOI
https://dx.doi.org/10.31030/2066736
Amendments

Cooperation at DIN

Your contact person

Also available in
Loading recommended items...
Loading recommended items...
Loading recommended items...
Loading recommended items...