Numéro |
J. Phys. IV France
Volume 107, May 2003
|
|
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Page(s) | 1041 - 1044 | |
DOI | https://doi.org/10.1051/jp4:20030477 |
J. Phys. IV France 107 (2003) 1041
DOI: 10.1051/jp4:20030477
Chromium in rivers impacted by tannery wastes determined by high performance liquid chromatography - inductively coupled plasma mass spectrometry
M.-H. Pereira de Abreu, D. Vignati and J. DominikInstitut F.-A. Forel, University of Geneva, 10 route de Suisse, 1290 Versoix, Switzerland
Abstract
The total chromium concentrations by ICP-MS and HPLC-ICP-MS and the redox chromium species
have been determined in rivers impacted by untreated wastes from tanneries at Fès (Morocco).
The results obtained by two ICP-MS analysis methods showed significantly different chromium values at
m/
z 53.
The higher values obtained with external calibration, can be attributed to matrix effects, especially
37Cl
16O at
m/
z 53. This is confirmed on the chromatograms by the presence of a peak at 100s with the anomalous
52Cr/
53Cr
isotopic ratio. The hexavalent chromium was not detected. Two trivalent chromium monomer species,
Cr(OH)(H
2O)
52+ and Cr(H
2O)
63+, were present in low concentrations. We suppose that the major part of
chromium occurred as Cr(III) polymeric species which were not retained on the column. These Cr(III) forms are
usually complexed with Cl
- or/and SO
42-, used as tanning agents.
© EDP Sciences 2003