Norm

NEN-EN-ISO 9308-1:2014 en

Water - Telling van Escherichia coli en bacteriën van de coligroep - Deel 1: Methode met membraanfiltratie voor water met een lage achtergrondconcentratie aan bacteriën

52,53

Over deze norm

Status Definitief
Aantal pagina's 10
Commissie Microbiologische parameters
Gepubliceerd op 01-10-2014
Taal Engels
NEN-EN-ISO 9308-1 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. This part of ISO 9308 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 β-D-glucuronidase negative, such as Escherichia coli O157, will not be detected as E. coli. As they are β-D-galactosidase positive, they will appear as coliform bacteria on this chromogenic agar.

Details

ICS-code 07.100.20
13.060.70
Nederlandse titel Water - Telling van Escherichia coli en bacteriën van de coligroep - Deel 1: Methode met membraanfiltratie voor water met een lage achtergrondconcentratie aan bacteriën
Engelse titel Water quality - Enumeration of Escherichia coli and coliform bacteria - Part 1: Membrane filtration method for waters with low bacterial background flora
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