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| Gnandi, K.; Tobschall, H.J.. |
| The marine coastal sediments from Togo have been analysed for the trace elements Cd, Cr, Cu, Ni, Pb, Sr, V, Zn and Zr to ascertain the geological impact of dumping of phosporite 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 of trace elements in the marine environment indicates that the concentrations of Cr, Cu, Ni, Pb, V, Sr and Zn increase seawards and along the coastal 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... |
| Tipo: Journal Contribution |
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| Ano: 1999 |
URL: http://hdl.handle.net/1834/2633 |
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| Gnandi, K.; Tobschall, H.J.. |
| 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... |
| Tipo: Journal Contribution |
Palavras-chave: Marine pollution; Trace elements; Phosphorite; Trace elements; Http://aims.fao.org/aos/agrovoc/c_7834. |
| Ano: 1999 |
URL: http://hdl.handle.net/1834/1400 |
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| Gnandi, K.; Tobschall, H.J.. |
| Metal concentrations of 37 soil samples taken from mining areas (abandoned mine pits and transport routes) in Kpogamé and Hahotoé (southern Togo) range from 0.2-43 ppm for Cd, 15-115 ppm for Pb, 182-1,029 ppm for Cr, 18-356 ppm for Cu, 15-342 pm for Ni, 90-513 ppm for V, 35-536 ppm for Zn, 80-469 ppm for Zr and 266-3,161 ppm for Sr. The tropical alteration of the ore waste plays an important role in the distribution of trace elements in the studied soils. Because the alteration affects the element mobility, generally old abandoned mining areas, which , together with soils near the transport routes, show a higher degree of contamination. Under low pH and oxidising conditions in studied soils Cd, Ni and Zn are generally easily mobilised and are thus... |
| Tipo: Journal Contribution |
Palavras-chave: Heavy metals; Mining; Phosphorite; Pollution; Heavy metals; Pollution; Http://aims.fao.org/aos/agrovoc/c_2223; Http://aims.fao.org/aos/agrovoc/c_6077. |
| Ano: 2002 |
URL: http://hdl.handle.net/1834/2715 |
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| Tobschall, H.J.; Gnandi, K.. |
| The marine coastal sediments from Togo have been analysed for the trace elements Cd, Cr, Cu, Ni, Pb, Sr, V, Zn and Zr to ascertain the geo-ecological 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 of trace elements in the marine environment indicates that the concentrations of Cr, Cu, Ni, Pb, V, Sr and Zn increase seawards and along the coastal 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... |
| Tipo: Journal Contribution |
Palavras-chave: Marine pollution; Trace elements; Trace elements; Http://aims.fao.org/aos/agrovoc/c_7834. |
| Ano: 1999 |
URL: http://hdl.handle.net/1834/1465 |
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