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Centre de Gestion Integrée du Littoral et de l'environnement >
Publications et notes réunies sur l'environnement marin et cotier >
Please use this identifier to cite or link to this item:
http://hdl.handle.net/1834/1400
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| Title: | The pollution of marine sediments by trace elements in the coastal region of Togo caused by dumping of cadmium-rich phosphorite tailing into the sea |
| Authors: | Gnandi, K.
Tobschall, H.J. |
| ASFA Terms: | Marine pollution
Trace elements
Phosphorite |
| Issue Date: | 1999 |
| Publisher: | Berlin : Springer |
| Citation: | Environmental geology, 38(1). p. 13-24 |
| Abstract: | The marine coastal sediments irom Togo
have been analysed for the trace elements Cd, Cr,
Cu, Ni, Pb, Sr, V, Zn and Zr to ascertain the geoecological
impact of dumping of phosphorite tailings
into the sea. Trace element concentrations
ranged from 2-44 ppm for Cd, 22-184 ppm for Cu,
19-281 ppm for Ni, 22-176 ppm for Pb, 179-
643 ppm for Sr, 38-329 ppm for V, 60-632 ppm for
Zn and 18-8928 ppm for Zr. Regional distribution
L of trace elements in the marine environment indicates
that the concentrations of Cr, Cu, Ni, Pb, V,
Sr and Zn increase seawards and aloug the coastal
a line outwards of the tailing outfall, whereas Cd and
Zr showed reversed spatial patterns. Sorting and
transport of phosphorite particles by coastal currents
are the main factors controlling the distribution
of particle-bound trace metals in the coastal
environment. The Cd, Sr and Zn concentrations decrease
with decreasing grain size in lnarine coastal
sediments, whereas Cr, Cu, Ni and Zn concentrations
increase with decreasing grain size. Percolation
and shaking experiments were carried out in
laboratory using raw phosphate material and artificial
sea water. Enhanced inobilization of Cd from
phosphorites by coutact with the sea water was observed. |
| URI: | http://hdl.handle.net/1834/1400 |
| ISSN: | 0943-0105 |
| Appears in Collections: | Publications et notes réunies sur l'environnement marin et cotier
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