Publication Date:
2021-05-19
Description:
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.
Description:
Published
Description:
Togo
Keywords:
Trace elements
;
Marine pollution
;
Trace elements
;
Phosphorite
Repository Name:
AquaDocs
Type:
Journal Contribution
,
Refereed
,
Article
Format:
5436492 bytes
Format:
application/pdf
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