DIN EN ISO 7899-3:2025-12
Water quality - Enumeration of intestinal enterococci - Part 3: Most probable number method (ISO 7899-3:2025); German version EN ISO 7899-3:2025
| Fecha edición: |
2025-12-01
En Vigor
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| Idiomas disponibles: | Inglés, Alemán |
| Resumen: | 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. |
| Keywords: | Bacteria|Bacteria cultures|Bacterial count|Bathing water|Counting|Culture|Definitions|Determination|Determination procedures|Drinking water|Enterococci|Faeces|Fresh water|Germs|Intestines|Methods|Microorganisms|Numbers|Quality assurance|Samples|Sampling methods|Seawater|Verification|Water|Water analysis|Water pollution|Water practice|Water quality|Water samples |
| ICS: | 07.100.20 - Microbiología del agua |
| CTN: | |
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Equivalencia Internacional |
Idéntica EN ISO 7899-3:2025 Idéntica ISO 7899-3:2025 |
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Reemplazo Normas |
Reemplaza a DIN EN ISO 7899-3:2024-06 |
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