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Abstract

The inter-comparison exercise discussed in this report is the third AQUACON exercise on samples with concentrations close to those of natural freshwater, and including chemical variables that play a major part in eutrophication studies, such as phosphate, total phosphorus, total nitrogen and silica. A total of 155 laboratories sent back results. Artificial surface water samples, with concentrations close to the values ordinarily measured in nature, and solutions of some specific chemicals were prepared in September 2000 by the Environment Institute of the Joint Research Council.

Results showed a high number of outliers in the measurements of ammonium, phosphate and nitrate, indicating a lack of precision, which was more, marked in the low concentration samples. For other variables the number of outliers is relatively low, but there is a wide dispersion of values around the expected concentrations. A detailed study of the causes of errors in ion chromatography analyses for anions and cations was part of the present inter-comparison. One important source of error was neglect of the non-linearity of calibration curves.

Additional information

Authors: MOSELLO R ET AL, Istituto Italiano di Idrobiologia, Consiglio Nazionale delle Recerche, Verbania Pallanza (IT);BIANCHI M, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);REMBGES D, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);MUNTAU H, European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra (IT);POLSELLO H, Istituto di Ricerca sulle Aque, Consiglio Nazionale delle Ricerche, Brugheria (IT)
Bibliographic Reference: EUR 20427 EN (2002), pp.114. 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: jrc-publications-office@ec.europa.eu
Record Number: 200215651 / Last updated on: 2002-12-12
Category: PUBLICATION
Original language: en
Available languages: en