Comparing EN 17075 and VaMPIS approaches for in situ continuous monitoring of free chlorine in drinking water |
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| Nathalie Guigues, Sandrine Raveau, Jérémie Majar, Gaëlle Canteau, Béatrice Lalere |
- Abstract:
- The performances of commercially available on-line analysers for monitoring free chlorine in water was carried out following protocols described in EN 17075 standard. Measurement uncertainty was estimated under controlled conditions considering bias, repeatability, and deviation from linearity as well as key influential factors for amperometric chlorine measurement: pH and temperature. The performance under real conditions was estimated as the percentile 90 of the differences between the free chlorine concentration measured by the on-line analyser, and the reference value obtained using the DPD (N,N-diethyl-1,4-phenylenediamine) method with a portable spectrophotometer, in accordance with EN 17075 standard. The VaMPIS (Validation of Measurement Procedures that Include Sampling) simultaneous approach using the duplicate method was applied to data obtained in real conditions from two on-line amperometric analysers. The measurement uncertainties estimated by both approaches agreed well, considering the confidence intervals of each of the estimates.
- Download:
- IMEKO-TC8-11-24-2025-035.pdf
- DOI:
- 10.21014/tc24-2025.035
- Event details
- IMEKO TC:
- TC24
- Event name:
- IMEKO TC8, TC11 and TC24 Conference
- Title:
Joint conference of the TCs ‘Traceability in Metrology’ (IMEKO TC8), ‘Measurement in Testing, Inspection and Certification’ (IMEKO TC11), and ‘Chemical Measurements’ (IMEKO TC24).
- Place:
- Torino, ITALY
- Time:
- 14 September 2025 - 17 September 2025