International Standard
ISO 9308-1:2014
Water quality — Enumeration of Escherichia coli and coliform bacteria — Part 1: Membrane filtration method for waters with low bacterial background flora
Reference number
ISO 9308-1:2014
Edición 3
2014-09
International Standard
Vista previa
ISO 9308-1:2014
55832
No disponible en español
Publicado (Edición 3, 2014)
Esta norma se revisó y confirmó por última vez en 2019. Por lo tanto, esta versión es la actual.
Esta norma tiene 1 modificaciones.

ISO 9308-1:2014

ISO 9308-1:2014
55832
Idioma
Formato
CHF 63
Convertir Franco suizo (CHF) a tu moneda

Resumen

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 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.

Informaciones generales

  •  : Publicado
     : 2014-09
    : Norma Internacional confirmada [90.93]
  •  : 3
     : 10
  • ISO/TC 147/SC 4
    07.100.20 
  • RSS actualizaciones

 Modificaciones

Las enmiendas se emiten cuando se decide que puede ser necesario agregar nuevo material a un documento de normalización existente. También pueden incluir correcciones editoriales o técnicas que deban aplicarse al documento existente.

Amendment 1

Edición 2016

ISO 9308-1:2014/Amd 1:2016
70094
Idioma
Formato
CHF 18
Convertir Franco suizo (CHF) a tu moneda

Ciclo de vida

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