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dc.contributor.authorDEHOUCK PIETERen_GB
dc.contributor.authorCORDEIRO RAPOSO Fernandoen_GB
dc.contributor.authorSNELL Jamesen_GB
dc.contributor.authorDE LA CALLE GUNTINAS Maria Beatrizen_GB
dc.identifier.citationANALYTICAL AND BIOANALYTICAL CHEMISTRY no. 408 p. 3223-3232en_GB
dc.description.abstractThis manuscript presents the results of the International Measurement Evaluation Programme 40 (IMEP-40) study, a proficiency test (PT) which was organized to assess the world-wide performance of laboratories for the determination of trace elements in seawater. This PT supports the implementation of the European Union Water Framework Directive 2000/60/EC, which aims at achieving a long-term high level protection of the aquatic environment, covering lakes, ground water and coastal waters. Forty-six participants reported results. The test item was seawater containing the trace elements As, Cd, Co, Cr, Cu, Fe, Mn, Mo, Ni, Pb, Se and Zn. The trace elements in the test item were present in very low concentrations to mimic natural levels. The results of the participants were rated with z- and zeta (ζ-) scores in accordance with ISO 13528 and ISO 17043. The standard deviation for proficiency assessment, σ̂, was set at 25 % of the respective assigned values for the 12 measured elements based on previous experience with similar PTs. The low levels of the trace elements combined with the high salt concentration of the seawater made the measurements challenging. Many laboratories were unable to detect or quantify the elements and reported "lower than X" values. The percentage of satisfactory performances (expressed as z-scores) ranged from 41% (Cr, Fe) to 86% (Mo). The PT study showed that the use of proper standard methods, like ISO 17294-2, and sensitive techniques, like inductively coupled plasma mass spectrometry (ICP-MS), contributed to performing well in this PT round.en_GB
dc.description.sponsorshipJRC.D.5-Standards for Food Bioscienceen_GB
dc.titleState of the art in the determination of trace elements in seawater: a worldwide proficiency testen_GB
dc.typeArticles in periodicals and booksen_GB
JRC Directorate:Health, Consumers and Reference Materials

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