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The International Measurement Evaluation Programme (IMEP) has now completed its 6th measurement round, (IMEP-6) Trace Elements in Water. The IMEP aims at being a tool for field laboratories to compare their results to SI-traceable values and is offered also to regulating and accrediting bodies. Samples with undisclosed values are sent to interested laboratories which return their measurement results with a statement of uncertainty claiming to contain the true value. The SI-traceable values are established by Isotope Dilution Mass Spectrometry (IDMS). For IMEP-6, this was done in collaboration with NIST (USA) and University of Regensburg (Germany). A strategy of IMEP is that the SI-traceable values, which will serve as references, should be obtained by means of well understood processes rather than from averaging a number of values from different analytical techniques. IMEP rounds are run in cases where the objective evaluation of measurement results are important (for example toxic and life-essential elements in water and body fluids). In IMEP-6, fourteen trace elements (Ag, B, Ba, Cd, Cu, Fe, Li, Mo, Ni, Pb, Rb, Sr, Tl and Zn) were under investigation in a synthetic and a natural water material. IMEP rounds planned in near future are shown.

Additional information

Authors: DE BIÈVRE P, JRC Geel (BE)
Bibliographic Reference: Paper presented: EUROLAB Workshop on Confidence in Testing-Customers' needs, Copenhagen (DK), September 10-11, 1997
Availability: Available from (1) as Paper EN 40859 ORA
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