Author(s) :

Jean Jacques Domondo Amogu, Jean Paul Mbo Nzundu, Gracias Ikamba Mbokolo, Ketsia Lokonge Yakeko, Lionel Shotsha Asamboa, M’pinga Trudon, Crispin Buveka Ngoma, Pius Tshimankinda Mpiana, Odette Ngandu Kabena.

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Abstract :

This study assessed the levels of copper and cobalt contamination, as well as the associated ecological risks, in the sediments of the Musonoïe River watershed in Kolwezi, Lualaba Province, in the Democratic Republic of the Congo. Water, soil, and sediment samples were collected and analyzed by ICP-OES to determine the concentrations of copper and cobalt. The spatial distribution of the metals was studied using the inverse distance weighting (IDW) interpolation method. The level of contamination was assessed using the enrichment factor (EF) and the geoaccumulation index (Geo), while ecological risks were estimated using the ecological risk index (Eri). The results revealed high concentrations of Cu and Co in the sediments, with areas of preferential accumulation located primarily near mine tailings and downstream confluence zones. Enrichment factor values range from 17 to 274 for copper and from 54 to 1,225 for cobalt, indicating severe enrichment and highlighting a significant anthropogenic contribution. The geoaccumulation index values ranged from 3 to 7.5 for copper and from 5.2 to 9.7 for cobalt, classifying the majority of sites as heavily to extremely contaminated. The ecological risk assessment revealed very high-risk levels for both metals, with Eri values ranging from 149 to 1,368 for copper and from 271 to 6,126 for cobalt. These results demonstrate a significant accumulation of metals in the sediments of the Musonoïe River watershed and highlight the significant ecological threat posed by mining activities

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