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A European standard (EN 15192) 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 derived from the alkaline digestion prescribed by EPA method 3060A and determines an operationally defined content of Cr(VI), including water-soluble and insoluble chromates. A robustness study was previously carried out in order to study the equivalency of different methods for the determination of Cr(VI) in waste and soil using an alkaline extraction and to produce a set of 4 validation samples (2 soil and 2 waste samples) with a homogeneous Cr(VI) load to be used for the interlaboratory trial. The performance characteristics observed for the Cr(VI) determination during this interlaboratory trial (participation of 19 European laboratories) were in the case of both soil samples and one waste sample acceptable. However, for the second waste sample a large relative reproducibility standard deviation suggesting strong matrix effects was observed.