Naslov
Trace elements dispersion from a tailings impoundment (dam) and speciation study in surrounding agricultural soils : A Case study from Kombat Mine area, Otavi Mountainland, Namibia

Autori
Mileusnić, Marta ; Ružičić, S. ; Mapani, B.S. ; Kamona, A.F. ; Mapaure, I. ; Chimwamurombe, P.M.

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the Annual workshop IGCP/SIDA No. 594 : Environmental and health impacts of mining in Africa / Mapani, B. ; Kříbek, B. - Prag : Czech Geological Survey, 2012, 37-40

ISBN
978-80-7075-781-9

Skup
Annual workshop IGCP/SIDA No. 594 : Environmental and health impacts of mining in Africa

Mjesto i datum
Windhoek, Namibija, 05.07.2012. - 06.07.2012

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
soil pollution; potentially toxic metals; tailings; mining; sequential leaching (extraction); bioavailability; environment; Kombat; Namibia

Sažetak
Kombat tailings dam (impoundment) has been exposed to water and wind erosion over a long period of time. In this study, the tailings, as well as surrounding arable soils, were characterised with respect to mineral and trace element composition. Sequential leaching procedure was used to determine binding mechanisms involved in the retention of metals in soils, which indicate trace metals bioavailability, threat to groundwater pollution, as well as dominant type of dispersion (hydromorphic or mechanical). Among seven analysed elements, copper and lead showed significantly high concentration in tailings and exceed maximal allowed values in farmland soils. Seasonal variations in metal concentrations are not observed. The main binding phase for Cu and Pb is the oxide fraction. Similar metal distribution in sequential leaching fractions of tailings and soils are in agreement with the assumption that wind and water are the main mechanical dispersal agents of the tailings to the surrounding farmlands. Although farmland soils are contaminated with Pb and Cu, these metals are relatively strongly bound to the soils and there is probably a small risk for their release in soil, water and later to the groundwater, although lead possesses a risk of intermediate bioavailability to plants and humans if it is ingested via dust.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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