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See detailMobility of copper and cobalt in metalliferous ecosystems: Results of a lysimeter study in the Lubumbashi Region (Democratic Republic of Congo)
Kaya Muyumba, Donato ULiege; Pourret, Olivier; Liénard, Amandine ULiege et al

in Journal of Geochemical Exploration (2019), 196

This paper presents the results of a lysimeter experiment in which a forest soil has been artificially spiked with rock fragments from natural copper (Cu) and cobalt (Co)-hills from Tenke-Fungurume ... [more ▼]

This paper presents the results of a lysimeter experiment in which a forest soil has been artificially spiked with rock fragments from natural copper (Cu) and cobalt (Co)-hills from Tenke-Fungurume (Democratic Republic of Congo). The Cu and Co contents of the percolating water have been analysed at repeated intervals and the impact of rock on the soil properties was evaluated at the end of the experiment. Five rocks were sampled in one copper hill. In natural conditions, these rock fragments located on the top of the hill are mixed to surface soil horizon along the slope through colluvial processes. The Cu and Co contents in rocks range respectively between 470 mg/kg (siliceous rock) and 140,000 mg/kg (shale) and between 450 mg/kg (dolostone) and 5,300 mg/kg (shale). Rock fragments were mixed with two horizons (hemi-organic A with 2.7% total organic carbon (TOC), and mineral B with 0.3% TOC) of an acid (pH water < 4.5) acrisol under forest. The mixture was placed in 1 L lysimeters and left in Lubumbashi ex situ conditions during the rainy season. Percolating water was collected for six periods after and the Cu and Co contents have been analysed. At the end of the experiment, soil from the lysimeter was removed for pH, TOC, available nutrients and trace elements, CaCl2-extractable Cu and Co analysis. The results show great differences between Cu and Co releases in the percolating solutions according to the nature of the rocks. The quantities released were correlated to the concentrations originally present in the unweathered rocks. Differences were also found between the A and B horizons, which indicate that the physicochemical properties of the soil influence reaction with the rocks. The differences between both horizons are mainly organic carbon content, cationic exchange capacity and nutrient content, which were higher in the A horizon. However, the pH of the A horizon was acidic compared with the B horizon. Significant correlations were found between extractable Cu and Co with concentrations of their leaching solution. Because of this, soluble Cu and Co extracted by CaCl2 can be regarded as vertical transfer risk prediction tools of Cu and Co in the soil. [less ▲]

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See detailChapitre 10. Evaluation expérimentale de la phytodisponibilité du cuivre et du cobalt dans les sols des écosystèmes métallifères de l’Arc cuprifère katangais
Kaya Muyumba, Donato ULiege; Pourret, Olivier; Liénard, Amandine ULiege et al

in Bogaert, Jan; Colinet, Gilles; Mahy, Grégory (Eds.) Anthropisation des paysages katangais (2018)

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See detailChapitre 11. Fond pédogéochimique et cartographie des pollutions des sols à Lubumbashi
Ngoy Shutcha, Mylor; Mukobo, Robert; Kaya Muyumba, Donato ULiege et al

in Bogaert, Jan; Colinet, Gilles; Mahy, Grégory (Eds.) Anthropisation des paysages katangais (2018)

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See detailAssessment of soil metal distribution and environmental impact of mining in Katanga (Democratic Republic of Congo)
Pourret, Olivier; Lange, Bastien; Bonhoure, Jessica et al

in Applied Geochemistry (2015)

Metal and metalloid (As, Cd, Co, Cu, Pb and Zn) distribution in soils from the Katanga Copperbelt (Democratic Republic of Congo) is investigated in order to characterize the environmental impacts of ... [more ▼]

Metal and metalloid (As, Cd, Co, Cu, Pb and Zn) distribution in soils from the Katanga Copperbelt (Democratic Republic of Congo) is investigated in order to characterize the environmental impacts of mining and smelting activities in that area. The concentrations of Cu, Co, As, Zn, Pb and Cd in soils from mining sites are higher than in non-metalliferous sites and above permissible metal and metalloid concentrations in soils. Moreover, the fractionation and mobility of Co, and Cu in such environment is assessed using the application of both ammonium acetate-EDTA extraction and speciation modeling (WHAM 6). The resulting data set covers wide range of environmental conditions (pH, trace metals concentration, natural soils and soils affected by mining and ore processing). These extractions show that only a small fraction of Cu and Co is mobile, with variation depending on sites: mobility is higher in soils affected by mining and ore processing. The strong affinity of Mn-oxides for Co may explain lower Co mobility in Mn-rich soils. The high Mn and Fe contents of Cu-Co soils from Katanga may actually exert a protective effect against the toxic effects of Co. Finally, Cu-Co speciation modeling of contaminated sites emphasizes that organic matter strongly sorb Cu whereas Co speciation is mostly by Mn content. This type of study leads to a better understanding of metal fractionation and can guide to define different practices of phytoremediation. © 2015 Elsevier Ltd. [less ▲]

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See detailModeling of cobalt and copper speciation in metalliferous soils from Katanga (Democratic Republic of Congo)
Pourret, Olivier; Lange, Bastien; Houben, David et al

in Journal of Geochemical Exploration (2015), 149

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See detailPhosphorus availability in agricultural soils of Wallonia (Belgium) - A modeling approach
Cobert, Florian ULiege; Pourret, Olivier; Renneson, Malorie ULiege et al

Poster (2013, August)

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See detailCopper tolerance and accumulation in two cuprophytes of South Central Africa: Crepidorhopalon perennis and C. tenuis (Linderniaceae)
Faucon, Michel-Pierre; Chipeng, François; Verbruggen, Nathalie et al

in Environmental and Experimental Botany (2012)

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See detailRelation between Cobalt Fractionation and its Accumulation in Metallophytes from South of Central Africa
Faucon, Michel-Pierre; Colinet, Gilles ULiege; Jitaru, P et al

in Mineralogical Magazine (2011), 75(3), 832

Detailed reference viewed: 26 (3 ULiège)