Determination of Water-Soluble Hexavalent Chromium in Clinker Samples by Wavelength-Dispersive X-ray Fluorescence Spectrometry After Concentration in Activated Layers

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Abstract:

The determination of hexavalent chromium (Cr(VI)) in cement-related material extracts is frequently monitored in cement industries to comply with the European Directive (2003/53/EC) that limits the use of cements containing more than 2 mg kg−1 of water-soluble Cr(VI). In the present work, a rapid and simple method for the determination of water-soluble Cr(VI) in clinker samples has been developed. The analytical methodology is based on the combined use of a low cost Cr(VI) isolation procedure using activated layers followed by their analysis using wavelength-dispersive X-ray fluorescence (WDXRF) spectrometry. WDXRF instrumentation is a common tool used for determining the chemical composition of all materials involved in cement production and also for the quality control of the products produced in cement and concrete factories. Therefore, the presented methodology does not imply the use of additional instrumentation in cement-industries laboratories and can be used as a comparative method to the spectrophotometric reference (EN 196-10:2006). The analytical parameters evaluated (selectivity, limit of detection, linearity, and precision) prove to be suitable for the intended purpose, and the methodology has successfully been applied to determine water-soluble Cr(VI) in several clinker samples.

Keywords: CEMENT DERMATITIS; CHROMIUM; CLINKER; WAVELENGTH-DISPERSIVE X-RAY FLUORESCENCE; WDXRF

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370210791211736

Affiliations: 1: Laboratory of X-Ray Analytical Applications, Institute of Earth Sciences "Jaume Almera", CSIC, Solé Sabarís s/n, 08028 Barcelona, Spain 2: Department of Chemistry, University of Girona, Campus Montilivi, 17071 Girona, Spain 3: Department of Quality Control. Cementos Molins Industrial S.A. Sant Vicenç dels Horts, 08620 Barcelona, Spain

Publication date: May 1, 2010

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