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FP7

IMEP-23, the eight WFD PAHs in water in presence of humic acid -Interlaboratory comparison report

Funded under: FP7-JRC

Abstract

The Water Framework Directive (WFD) 2000/60/EC provides a legislative framework for the protection of inland and coastal waters in the EU. Decision 2455/2001/EC defines the major (priority) water pollutants and Proposal 2006/0397/EC their maximum levels. These include seven polycyclic aromatic hydrocarbons (PAHs): naphthalene, anthracene, benzobfluoranthene, benzokfluoranthene, benzoapyrene, indeno1,2,3-cdpyrene and benzoghiperylene, plus fluoranthene as an indicator substance. These eight PAHs are the subject of this study. The matrix is ground water with humic acid which was added to simulate colloidal organic matter in surface water. The PAH concentrations were set close to the levels of the Proposal when practically feasible. The concentrations of six congeners were certified (i.e. given a reference value plus the associated uncertainty) whereas only indicative values could be attributed to benzoapyrene and benzoghiperylene. The presence of humic acid made the certification campaign very complicated. PAHs adsorb onto humic acid and this can lead to material losses that may remain undetected if no internal standard is used or the internal standard is given insufficient time to reach the adsorption equilibrium before further sample treatment. There are indications that a number of participating routine laboratories have overlooked this effect.

Additional information

Authors: VAN DE CALLE J, European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Geel (BE);DE LA BYNENS B, European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Geel (BE)
Bibliographic Reference: EUR 23287 EN (2008), 65 pp. Free of Charge
Availability: http://bookshop.europa.eu/is-bin/INTERSHOP.enfinity/WFS/EU-Bookshop-Site/en_GB/-/EUR/ViewPublication-Start?PublicationKey=LANA23287 (Catalogue Number: LA-NA-23287-EN-C)
Record Number: 200819934 / Last updated on: 2008-07-28
Category: PUBLICATION
Original language: en
Available languages: en