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Uniform analyses for clean drinking water in Europe
Date:12/10/2009

oncept for conducting round-robin tests by PTB, AQS BW and IWW uses metrologically traceable reference values with possible uncertainties in the range of one percent or less. These reference values serve as a basis for the increasingly required international comparability of measurement values and are, moreover, available to the participating laboratories as reliable reference points for checking the accuracy of their measuring methods.

This is made possible by very accurate sample preparation: The sample preparations are performed by gravimetric or volumetric addition of certain amounts of the analytes to tap water (matrix). The reference values are determined from the added amounts as well as the concentration of the analytes present from the outset in the original tap water. To determine the latter is difficult, however, due to the mostly low concentration. It was now possible to demonstrate that the participants' results could be drawn on to determine the initial concentration of the water. To this end, a method similar to that of the standard addition was developed, with which these initial concentrations were obtained through extrapolation, without additional work expended and with sufficiently good uncertainty.

Contact at PTB: Detlef Schiel, Working Group 3.11 Inorganic Analytics, Tel.: +49 531 592-3110, e-mail: detlef.schiel@ptb.de Olaf Rienitz, Working Group 3.11 Inorganic Analytics, Tel.: +49 531 592-3318, e-mail: olaf.rienitz@ptb.de


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Contact: Detlef Schiel
detlef.schiel@ptb.de
49-531-592-3110
Physikalisch-Technische Bundesanstalt (PTB)
Source:Eurekalert

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