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Sampling standard reference
The syllabus contains standard references for all analyses and components. These are also stated on the analysis report. The Sampling tab contains the standard references for sampling activities that cannot always be linked directly to a specific component or analysis.
Note on statistically significant counting areas in microbiological research
Membrane filtration techniques (coli37, E. coli, enterococci, sulfite-reducing clostridia, aeromonas, Clostridium perfringens) have a statistically significant counting range between 10 and 80 colony forming units per plate. For the moulding plate method (colony number 22 °C and 37 °C) and the method for Legionella, a statistically significant counting range between 10 and 300 colony-forming units per plate applies.
- If 0 colony forming units are reported in the examined volume, this should be interpreted as: “the micro-organism was not found in the examined volume”;
- If 1 or 2 colony forming units are reported in the examined volume, this should be interpreted as “the micro-organism is present in the examined volume”;
- If 3 to 9 colony forming units are reported in the examined volume, this should be interpreted as “an estimated number of colony forming units in the examined volume”.
- The analysis report does not mention these interpretations.
If numbers are reported above the counting areas mentioned, the reported value must be regarded as indicative. However, this is stated on the report. The counting areas are in accordance with NEN-EN-ISO 8199, 2018. If the result is obtained from multiple analysis in microbiological research, the mean is used.
The current syllabus views have incorporated the changes until March 31, 2021. Current data, as well as historical data, are registered in our LIMS and are always available on request.
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