Title: IMEP-23: The Eight EU-WFD Priority PAHs in Water in the Presence of Humic Acid
Authors: VAN DE KREEKE JohannesDE LA CALLE GUNTINAS Maria BeatrizHELD AndreaBERCARU OfeliaRICCI MarinaSHEGUNOVA PenkaTAYLOR Philip
Citation: TRAC-TRENDS IN ANALYTICAL CHEMISTRY vol. 29 no. 8 p. 928-937
Publisher: ELSEVIER SCIENCE LONDON
Publication Year: 2010
JRC Publication N°: JRC57254
ISSN: 0165-9936
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC57254
DOI: 10.1016/j.trac.2010.04.009
Type: Articles in Journals
Abstract: Recently, the International Measurement Evaluation Programme (IMEP) organized an interlaboratory comparison on total concentrations of eight polycyclic aromatic hydrocarbons (PAHs) in natural inland waters. It was carried out in support to the European Union Water Framework Directive (EU-WFD) that lists these eight as priority substances. As sample matrix, we used groundwater spiked with humic acid as a model for the colloidal substances that are present in natural inland waters. Humic substances can adsorb PAHs, but we found that some laboratories did not apply analytical procedures that sufficiently accounted for this. One of these laboratories was involved in establishing the reference values. We show how this impacted on the reliability of their measurements. Many participants accepted our invitation to report their measurement uncertainties. We assessed their results against our reference values and uncertainties, and provided z and zeta scores. Although the overall measurement capability appears satisfactory, there is room for improvement of analytical procedures as regards the use of measurement standards.
JRC Institute:Institute for Reference Materials and Measurements

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