DIN Standards Committee Water Practice
Water quality - Enumeration of intestinal enterococci - Part 3: Most probable number method (ISO/DIS 7899-3:2024); German and English version prEN ISO 7899-3:2024
Abstract
This document specifies a method for the enumeration of intestinal enterococci in water. The method is based on the growth of target organisms in a liquid medium and calculation of the “Most Probable Number” (MPN) of microorganisms by reference to MPN tables or using informatic programs. The test described in this document relies upon the detection of intestinal enterococci based upon expression of the enzyme ß-D-glucosidase. This method provides a confirmed result in 24 h with no requirement for confirmation of positive wells. This method can be applied to a range of types of water (for example, drinking water, bathing water, groundwater, surface water and wastewater), including those containing an appreciable amount of suspended matter and high background counts of heterotrophic bacteria. For marine waters, enterococci are best enumerated using diluted samples.
Begin
2023-07-14
WI
00230436
Planned document number
DIN EN ISO 7899-3
Project number
11904903
Responsible national committee
NA 119-01-03-03 UA - Microbiology
Responsible european committee
Responsible international committee
ISO/TC 147/SC 4/WG 29 - Enterococci
draft standard
Water quality - Enumeration of intestinal enterococci - Part 3: Most probable number method (ISO/DIS 7899-3:2024); German and English version prEN ISO 7899-3:2024
2024-06
Order from DIN Media
