Ensuring international comparability of chemical measurements of Chilean laboratories through the international measurement evaluation programme (IMEP) of IRMM
An analytical intercomparison programme was organized for Chilean laboratories involved in the determination of trace elements in water. Two water samples were distributed to the participating laboratories. One of the samples was synthetic and one was natural water. In addition, a certified water reference material was sent to the laboratories for validation of the analytical methods prior to the analysis of the samples of interest. 26 laboratories reported results. The reported results present a distribution normally found in this type of comparison: some lower and higher values as compared to the certified (assigned) concentrations with others comparable to the true value. Not all laboratories reported results for all the elements for which there were certified or assigned concentration values in both samples. Most of the laboratories are concerned with those elements that have an economic (ie Cu, Fe, Ni, Zn) or environmental relevance (ie, As, Cd, Pb). To a lesser extent, the elements Ba, Li, Mo and Se could to be measured by some of the participating laboratories. It can be inferred that the elements Ag, B, Rb, Sr and Tl are not often requested by the users since just a few laboratories measured them in this programme.
Bibliographic Reference: Paper presented: Conference BERM-7, Antwerpen (NL), 21-25 April 1997
Availability: Available from (1) as Paper EN 41112 ORA
Record Number: 199810234 / Last updated on: 1998-03-09
Original language: en
Available languages: en