TY - JOUR A1 - Tirez, K. A1 - Scharf, Holger A1 - Calzolari, D. A1 - Cleven, R. A1 - Kisser, M. A1 - Lück, Detlef T1 - Validation of a European standard for the determination of hexavalent chromium in solid material T2 - Journal of environmental monitoring N2 - A European standard for the determination of Cr(VI) in solid material has been elaborated in the framework of an international co-operation and finally validated in the course of an interlaboratory comparison. The procedure is based on the alkaline digestion prescribed by EPA method 3060A followed by ion chromatography and determines an operationally defined content of Cr(VI), including water-soluble and insoluble chromates. A preliminary robustness study was carried out in order to compare different extraction methodologies and to study the equivalency of different analytical methods for the determination of Cr(VI) in alkaline extracts of soil and waste materials. During an interlaboratory validation trial with 19 European laboratories a set of 4 samples (2 soil and 2 waste samples) was analysed to determine performance characteristics for different combinations of digestion and detection methods. With the procedures prescribed by the new European standard (EN 15192) acceptable results were obtained for both soil samples and one of the waste samples (sludge). However, for the second waste sample (fly ash) a large deviation in analytical results was observed. This indicates that particularly for waste materials a possible occurrence of strong matrix effects has to be considered and supplementary quality control data are needed in order to assess the validity of analytical results. The accuracy of the determination of Cr(VI) in solid matrices remains a challenging field in terms of maximum extraction efficiency and minimum species interconversion. PB - Royal Society of Chemistry CY - Cambridge KW - Umweltanalytik KW - Chrom(VI) KW - Boden KW - Abfall KW - Validierung KW - Europäische Norm PY - 2007 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/15043 AN - OPUS4-15043 SN - 1464-0325 SN - 1464-0333 VL - 9 IS - 7 SP - 749 EP - 759 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany