High contamination in the areas surrounding abandoned mines and mining activities: An impact assessment of the Dilala, Luilu and Mpingiri Rivers, Democratic Republic of the Congo

Atibu, Emmanuel K.; Lacroix, Pierre; Sivalingam, Periyasamy; Ray, Nicolas; Giuliani, Gaston; Mulaji, Crispin K.; Otamonga, Jean‐Paul; Mpiana, Pius T.; Poté, John

doi:10.1016/j.chemosphere.2017.10.052

Cited by 56 publications

(22 citation statements)

References 46 publications

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“…The sediment quality guideline set by CCME (2010) [53] for the protection of aquatic life is 35 mg/kg Co (Table 2). Cobalt concentrations in stream sediments from the mining regions of DRC [39,69] and the Idaho Cobalt Belt in the USA [38] are many orders of magnitudes higher than this guideline value. Some of the stream sediments from mining regions reported in Table 4 do not exceed this guideline.…”

Section: Cobalt In Mine Watersmentioning

confidence: 77%

Geochemistry, Mineralogy and Microbiology of Cobalt in Mining-Affected Environments

2020

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Cobalt is recognised by the European Commission as a “Critical Raw Material” due to its irreplaceable functionality in many types of modern technology, combined with its current high-risk status associated with its supply. Despite such importance, there remain major knowledge gaps with regard to the geochemistry, mineralogy, and microbiology of cobalt-bearing environments, particularly those associated with ore deposits and subsequent mining operations. In such environments, high concentrations of Co (up to 34,400 mg/L in mine water, 14,165 mg/kg in tailings, 21,134 mg/kg in soils, and 18,434 mg/kg in stream sediments) have been documented. Co is contained in ore and mine waste in a wide variety of primary (e.g., cobaltite, carrolite, and erythrite) and secondary (e.g., erythrite, heterogenite) minerals. When exposed to low pH conditions, a number of such minerals are known to undergo dissolution, typically forming Co2+(aq). At circumneutral pH, such aqueous Co can then become immobilised by co-precipitation and/or sorption onto Fe and Mn(oxyhydr)oxides. This paper brings together contemporary knowledge on such Co cycling across different mining environments. Further research is required to gain a truly robust understanding of the Co-system in mining-affected environments. Key knowledge gaps include the mechanics and kinetics of secondary Co-bearing mineral environmental transformation, the extent at which such environmental cycling is facilitated by microbial activity, the nature of Co speciation across different Eh-pH conditions, and the environmental and human toxicity of Co.

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Section: Cobalt In Mine Watersmentioning

confidence: 77%

Geochemistry, Mineralogy and Microbiology of Cobalt in Mining-Affected Environments

2020

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“…La littérature note cependant que les mines abandonnées et les activités minières à Kolwezi, constituent d'importantes sources des métaux toxiques affectant les compartiments environnants [18] et la concentration de ces métaux dans les eaux des rivières qui constituent pour l'essentiel l'exhaure excède les normes de l'OMS et d'Aquatic Quality Guidelines for the Protection of Aquatic Life recommandations [19,20]. Une autre étude signale à ce sujet des risques d'exposition associée à la nature des activités menées dans un cours d'eau soumis à la pression anthropique [21].…”

Section: Discussionunclassified

Risk Behaviours among Women in Artisanal Mining of Mineral Substances on Sites in Kolwezi, DRC

Kabwita¹,

Kautd²,

Basilea³

et al. 2018

IJMCR

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“…The geo-accumulation index (Igeo) is a quantitative index as defined by Müller 26 and is widely used to assess heavy metal pollution in sediments of rivers and lakes [27][28][29] . The equation for calculating Igeo is as follows:…”

Section: Assessment Of Contaminations In Sedimentmentioning

confidence: 99%

Pollution, Ecological Risk and Source Identification of Heavy Metals in Sediments from the Huafei River in the Eastern Suburbso Kaifeng, China

Jin

Wang

Lou

et al. 2021

Preprint

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Rivers in urban environments are significant components of their ecosystems but remain under threat of pollution from unchecked discharges of industrial sewage and domestic wastewater. Such river pollution, particularly over the longer term involving heavy metals, is an issue of worldwide concern regarding risks to the ecological environment and human health. In this study, we investigate the long-term pollution characteristics of the Huafei River, an important urban river in Kaifeng, China. River sedimentary samples were analyzed, assessing the degree and ecological risk of heavy metal pollution using the geo-accumulation index and potential ecological risk index methods; whilst Pearson’s correlation, principal component, and cluster analyses were used to identify the sources of pollution. The results show that heavy metal concentrations are significantly higher than their corresponding fluvo-aquic soil background values in China, and the geo-accumulation indexes indicate, that of the 8 heavy metals identified, Hg is most prevalent, followed in sequence by Cd > Zn > Cu > Pb > Ni > As > Cr. The potential ecological risk index of the Huafei river is very high, with the potential ecological risk intensity highest in the midstream and downstream sections where it is recommended that pollution control is carried out, especially concerning Hg and Cd. Long-term sequence analysis indicates that Cu and Pb dropped sharply from 1998 to 2017, but rebounded in 2019, and that Zn shows a continuous decreasing trend. Four main sources for the heavy metal contaminants were identified: Cr, Cu, Ni, Pb, Zn and Hg derived mainly from industrial activities, traffic sources and natural sources; Cd originated mainly from industrial and agricultural activities; whilst As was mainly associated with industrial activities. It is anticipated that the findings of this study will provide theoretical references for the effective control and scientific management of heavy metal pollution in the Huafei River and its surrounding areas.

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High contamination in the areas surrounding abandoned mines and mining activities: An impact assessment of the Dilala, Luilu and Mpingiri Rivers, Democratic Republic of the Congo

Cited by 56 publications

References 46 publications

Geochemistry, Mineralogy and Microbiology of Cobalt in Mining-Affected Environments

Geochemistry, Mineralogy and Microbiology of Cobalt in Mining-Affected Environments

Risk Behaviours among Women in Artisanal Mining of Mineral Substances on Sites in Kolwezi, DRC

Pollution, Ecological Risk and Source Identification of Heavy Metals in Sediments from the Huafei River in the Eastern Suburbso Kaifeng, China

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