Benefits of the implementation of a metrological structure for water analyses |
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Authors: | Email author" target="_blank">Ph?CharletEmail author A?Marschal |
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Institution: | (1) Bureau National de Métrologie—Laboratoire National d'Essais, 1 rue Gaston Boissier, 75724 Paris Cedex 15, France |
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Abstract: | Traceability of measurements still often remains a non-operational notion for end-user chemists. A practical project, sponsored by the French Ministry of Research, has been conducted to evaluate and to demonstrate possible benefits of the implementation of a metrological structure for improvement of the quality of water analyses. LNE (Laboratoire National d'Essais) was in charge of the build up of the traceability chain in a concrete case of determination of some heavy metals (cadmium and lead) in a groundwater. Pure solutions for calibration and a matrix RM have been certified by LNE and then used by 46 labs (mainly French) in a inter-laboratory study. Results have shown a measurable bias in lead analysis in the groundwater for all methods in routine use by laboratories. This project has demonstrated the interest of a metrological approach for method calibration, method validation and estimation of measurement uncertainty. |
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Keywords: | Metrology Traceability Analytical chemistry Certified reference material Water analyses |
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