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Norm

ISO 9308-1:2014

Ausgabedatum: 2014 09 16

Water quality — Enumeration of Escherichia coli and coliform bacteria — Part 1: Membrane filtration method for waters with low bacterial background flora

ISO 9308-1:2014 specifies a method for the enumeration of Escherichia coli (E. coli) and coliform bacteria. The method is based on membrane filtration, subsequent culture...
Gültig
Herausgeber:
International Organization for Standardization
Format:
Digital | 10 Seiten
Sprache:
Englisch

ISO 9308-1:2014 specifies a method for the enumeration of Escherichia coli (E. coli) and coliform bacteria. The method is based on membrane filtration, subsequent culture on a chromogenic coliform agar medium, and calculation of the number of target organisms in the sample. Due to the low selectivity of the differential agar medium, background growth can interfere with the reliable enumeration of E. coli and coliform bacteria, for example, in surface waters or shallow well waters. This method is not suitable for these types of water.

ISO 9308-1:2014 is especially suitable for waters with low bacterial numbers that will cause less than 100 total colonies on chromogenic coliform agar (CCA). These may be drinking water, disinfected pool water, or finished water from drinking water treatment plants.

Some strains of E. coli which are ß-D-glucuronidase negative, such as Escherichia coli O157, will not be detected as E. coli. As they are ß-D-galactosidase positive, they will appear as coliform bacteria on this chromogenic agar.

ISO 9308-1:2014
2014 09 16
Water quality — Enumeration of Escherichia coli and coliform bacteria — Part 1: Membrane filtration ...
Norm
ISO 9308-1:2000/Cor 1:2007
2007 06 14
Water quality — Detection and enumeration of Escherichia coli and coliform bacteria — Part 1: Membra...
Norm
ISO 9308-1:2000
2000 09 21
Water quality — Detection and enumeration of Escherichia coli and coliform bacteria — Part 1: Membra...
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ISO 9308-1:1990
1990 09 20
Water quality — Detection and enumeration of coliform organisms, thermotolerant coliform organisms a...
Norm
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