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BOS ISO 9308-1:2014
P444.60
Water quality — Enumeration of Escherichia coli and coliform bacteria — Part 1: Membrane
filtration method for waters with low bacterial
background flora
Description
This part of ISO 9308 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.