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The International Measurement Evaluation Programme (IMEP) was established in order to shed light on the current state of practice in chemical amount measurements. The aim of this inter-laboratory comparison was to picture objectively the degree of equivalence and the quality of chemical measurements by comparing participants measurement results with external reference values. IMEP-12 was the fourth inter-laboratory comparison in a series of water comparisons, IMEP-3, IMEP-6 and IMEP-9 being the previous ones.

Under directive 98/83/EC it is obligatory to monitor the water quality by means of frequent measurements. Hence, measurements of metals (such as Cd and Pb) in water play a key role in complying with this directive. Participants in IMEP-12 were asked to measure the amount of As, B, Cd, Cr, Cu, Fe, Mg, Mn, Ni and Pb. Measurement results were reported by 348 participants, from 46 countries and 5 continents. This report presents in a graphical form the results of all participants together with the reference value. Sorting the results was done according to different criteria e.g. certification, authorisation for the element under investigation in this type of material, analytical technique used, the quality management system in use in the laboratory and geographical location.

Additional information

Authors: PAPADAKIS I ET AL, European Commission, Joint Research Centre, Institute for Reference Materials and Measurements (IRMM), Geel (BE)
Bibliographic Reference: EUR 20156 EN (2002), 93pp. Free of charge
Availability: Available from European Commission, JRC Knowledge Management Unit, Ispra (IT) Tel: +39 033278 9843 or +39 033278 9864 Fax: +39 033278 9623 E-mail:
Record Number: 200315865 / Last updated on: 2003-02-13
Original language: en
Available languages: en