Article (Scientific journals)
Mobility of copper and cobalt in metalliferous ecosystems: Results of a lysimeter study in the Lubumbashi Region (Democratic Republic of Congo)
Kaya Muyumba, Donato; Pourret, Olivier; Liénard, Amandine et al.
2019In Journal of Geochemical Exploration, 196, p. 208-218
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Keywords :
Trace elements; Cobalt; Copper; Lysimeter; Rock weathering; Soil horizons; Mobility/bioavailability
Abstract :
[en] 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.
Disciplines :
Agriculture & agronomy
Geological, petroleum & mining engineering
Earth sciences & physical geography
Author, co-author :
Kaya Muyumba, Donato ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech
Pourret, Olivier
Liénard, Amandine ;  Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Echanges Eau-Sol-Plantes
Bonhoure, Jessica
Mahy, Grégory ;  Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Biodiversité et Paysage
Luhembwe, Michel Ngongo
Colinet, Gilles  ;  Université de Liège - ULiège > Ingénierie des biosystèmes (Biose) > Echanges Eau-Sol-Plantes
Language :
English
Title :
Mobility of copper and cobalt in metalliferous ecosystems: Results of a lysimeter study in the Lubumbashi Region (Democratic Republic of Congo)
Publication date :
2019
Journal title :
Journal of Geochemical Exploration
ISSN :
0375-6742
eISSN :
1879-1689
Publisher :
Elsevier, Netherlands
Volume :
196
Pages :
208-218
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 13 November 2018

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