Spectrometric determination of silicon in food and biological samples: an interlaboratory trial

Kristien Van Dyck; Harry Robberecht; Rudy Van Cauwenbergh; Hendrik Deelstra; Josiane Arnaud; Lieve Willemyns; Frank Benijts; José A. Centeno; Helen Taylor; Maria E. Soares; Maria L. Bastos; Margarida A. Ferreira; Patrick C. D'Haese; Ludwig V. Lamberts; Michel Hoenig; Günter Knapp; Stanislaw J. Lugowski; Luc Moens; Jörgen Riondato; René Van Grieken; Martine Claes; Rudy Verheyen; Lieve Clement; Marc Uytterhoeven

doi:10.1039/B000572J

Kristien Van Dyck,^a Harry Robberecht,*^a Rudy Van Cauwenbergh,^a Hendrik Deelstra,^a Josiane Arnaud,^b Lieve Willemyns,^c Frank Benijts,^c José A. Centeno,^d Helen Taylor,^e Maria E. Soares,^f Maria L. Bastos,^f Margarida A. Ferreira,^f Patrick C. D'Haese,^g Ludwig V. Lamberts,^g Michel Hoenig,^h Günter Knapp,ⁱ Stanislaw J. Lugowski,^j Luc Moens,^k Jörgen Riondato,^k René Van Grieken,^l Martine Claes,^l Rudy Verheyen,^m Lieve Clement^m and Marc Uytterhoevenⁿ

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* Corresponding authors

^a Antwerp University (UIA), Department of Pharmaceutical Sciences, Laboratory of Food Sciences, Universiteitsplein 1, Antwerp (Wilrijk), Belgium
E-mail: labrom@uia.ua.ac.be

^b Laboratory for the Biology of Oxidative Stress, Université Joseph Fourier (Grenoble I), France

^c Laboratory ECCA, Zwijnaarde, Belgium

^d Biophysical Toxicology Branch, Armed Forces Institute of Pathology, Washington DC, USA

^e Centre for Inorganic Chemistry Materials Science, Keele University, UK

^f Laboratory of Bromatology and Toxicology, University of Porto, Portugal

^g Laboratory of Nephrology and Hypertension, Antwerp University (UIA), Belgium

^h Centre for Veterinary and Agrochemical Research, Ministry of Agriculture, Belgium

ⁱ Institute for Analytical Chemistry, Micro- and Radiochemistry, Technische Universität Graz, Austria

^j Centre for Biomaterials, University of Toronto, Canada

^k Laboratory of Analytical Chemistry, University of Ghent, Belgium

^l Micro- and Trace Analysis Centre, Antwerp University (UIA), Belgium

^m Water Laboratory, Antwerp University (UIA), Belgium

ⁿ AML Hof ter Beke, Wilrijk, Belgium

Abstract

Accuracy and precision of silicon determination in biological matrices (serum, urine, water, beer and spinach) by spectrometric techniques (when necessary after acid destruction) were assessed by means of a collaborative interlaboratory trial. The trial was set up in accordance with ISO 5725-2 (1994). The relative overall repeatability standard deviation was acceptable. It varied between 4% for spinach powder (mean content: 176 mg kg⁻¹) and 11% for serum (mean content: 5.33 mg L⁻¹). On the other hand, the relative overall between-laboratory standard deviation was found to vary from a satisfactorily 15% for spinach after destruction (mean content: 3.32 mg L⁻¹) to an unacceptable 107% for spinach powder (mean content: 176 mg kg⁻¹). The overall conclusion of the trial was that silicon determination in biological matrices can properly be performed by spectrometric techniques. However, when sample pretreatment (i.e., acid destruction) is needed prior to silicon determination problems still remain.

Journal of Analytical Atomic Spectrometry

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Spectrometric determination of silicon in food and biological samples: an interlaboratory trial

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