Comparison of three sequential extraction procedures (original and modified 3 steps BCR procedure) applied to sediments of different origin

Laura Craba, Claudia Brunori, Mara Galletti, Carlo Cremisini, Roberto Morabito

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The 3 steps sequential extraction procedure proposed by the Standards Measurements and Testing program (SM&T - formerly BCR) of the European Union has been applied for the speciation of metals in sediments. Results obtained by the application of the BCR standardized procedure were compared to those of two four step sequential extraction procedures, which are different from the BCR procedure only for the introduction of an additional step with NaOCl, as 2ndand 3rdstep respectively. Five different metals have been taken into consideration: Cd, Cu, Ni, Pb and Zn. The analytical performances of the laboratory have been evaluated using three certified reference materials: the BCR 601 lake sediment for the BCR sequential extraction procedure, PACS-1 and MESS-1 for total metal concentration. Results showed that the efficiency of NaOCl treatment is higher or at least equal to that of H2O2treatment and that its selectivity is quite satisfying. Moreover the NaOCl treatment doesn't significantly influence the extraction of the easily reducible fraction.
Original languageEnglish
Pages (from-to)409 - 419
Number of pages11
JournalAnnali di Chimica
Issue number5-6
Publication statusPublished - May 2004
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Environmental Science(all)

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