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An optimised BCR three steps sequential extraction procedure (BCRSEP) and several single extractions with KCl, NH4Cl, Na4P2O7 and 0.5molL1 HCl were used for the fractionation of Al, Cu, Fe, Mn, Pb and Zn in CRMs and in samples from a mining area with sulphidic deposits. A good interlaboratory comparability was obtained for Cu, Pb and Zn in CRM483, CRM701, SRM2710 and SRM2711 by BCRSEP. The reliability...
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