Toxic metal concentration and ecotoxicity test of sediments from dense populated areas of Congo River, Kinshasa, Democratic Republic of the Congo

Mata, Henry K.; Salah, Dhafer Mohammed M. Al; Ngweme, Georgette N.; Konde, Joel N.; Mulaji, Crispin K.; Kiyombo, Guillaume Mbela; Poté, John

doi:10.1016/j.enceco.2020.07.001

Cited by 21 publications

(10 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The lowest amounts were observed, in both seasons, at S-1 (Foum Agoutir, inlet of the lagoon), due to high hydrodynamic characteristic at this station and for the prevalence of sandy texture [26]. Generally, sediments in rough waters are sandy and then exhibit lower metal contents [47]. On the contrary, the maximum amounts of OM, that speed up the adsorption of the metals from the overlying water to bottom sediments, were recorded at station S-2 and S-4 due to the presence of seagrass, which encourages the retention of the fine particles.…”

Section: Geochemical Resultsmentioning

confidence: 83%

“…The EF is used to evaluate the degree of anthropogenic influence on the occurrence of a metal in the soil/sediment; it is calculated through the ratio of the metal concentration in the sample with respect to the background matrix, using a normalizing element [46]. Several conservative elements have been used for normalization purposes [47][48][49], but we selected Al since it is generally the major constituent of clay minerals.…”

Section: Pollution Indicesmentioning

confidence: 99%

See 1 more Smart Citation

Assessment of Trace Metals in Sediments from Khnifiss Lagoon (Tarfaya, Morocco)

Tnoumi

Angelone

Armiento

et al. 2020

Earth

View full text Add to dashboard Cite

Surface sediments from Khnifiss lagoon (Morocco) were analyzed to evaluate the contamination degree of the area. Concentrations of V, Cr, Co, Ni, Cu, Zn, As, Cd, Hg, and Pb were determined on samples taken during the summer and the autumn of 2016. On the whole, higher concentrations were found in the summer season. The results revealed the following average concentrations (mg/kg), reported in descending order: Zn (51.7 ± 31.3) > V (38.8 ± 24.7) > Cr (26.6 ± 17.8) > Ni (16.5 ± 5.47) > As (8.50 ± 2.00) > Cu (6.60 ± 3.81) > Pb (6.13 ± 3.46) > Co (3.57 ± 2.09) > Cd (0.16 ± 0.11) > Hg (0.006 ± 0.001). Organic matter showed a positive significant correlation with some trace metals (mainly V, Cr, Co, Zn, Cd, Pb). Three pollution indices were calculated: Enrichment Factor (EF), Index of Geo−accumulation (Igeo), and Pollution Load Index (PLI). Minimal enrichments (for Zn, As, and Cd) were detected at some sampling points. Overall indices showed that the Khnifiss sediments can be classified as not contaminated, and that the trace metals amounts found are ascribable to the geogenic origin. The results of this work can be used as a starting point for further evaluations of trace metals distribution in Moroccan lagoons.

show abstract

Section: Geochemical Resultsmentioning

confidence: 83%

Section: Pollution Indicesmentioning

confidence: 99%

Assessment of Trace Metals in Sediments from Khnifiss Lagoon (Tarfaya, Morocco)

Tnoumi

Angelone

Armiento

et al. 2020

Earth

View full text Add to dashboard Cite

show abstract

“…There are 4 megacities on the countries boarding the South Atlantic that significantly impact the coastal zones: São Paulo and Rio de Janeiro, in Brazil; Buenos Aires, in Argentina; and Kinshasa, in Democratic Republic of Congo (Cirelli and Ojeda, 2008;Rocha et al, 2009Rocha et al, , 2010Wagener et al, 2010;Avigliano et al, 2015;Fries et al, 2019;Mata et al, 2020). Though São Paulo and Kinshasa are not coastal cities, they are both connected to the Atlantic through fluvial systems (e.g., Congo River).…”

Section: Socio-economic Aspectsmentioning

confidence: 99%

Pollutants in the South Atlantic Ocean: Sources, Knowledge Gaps and Perspectives for the Decade of Ocean Science

et al. 2021

View full text Add to dashboard Cite

The current manuscript presents the main issues related to the “Clean Ocean” outcome that arose from the Regional South Atlantic (SA) Planning Workshop for the UN Decade of Ocean Science and five Brazilian Regional Planning Workshops. An interdisciplinary and trans-sectoral group constituted by the academia, non-governmental agencies, the private sector, decision-makers, the navy, and local communities discussed the main anthropogenic drivers compromising the current environmental status of the SA and its ecological services, and debated the main research gaps, priorities and needs for improving technical and structural capacities in order to roadmap the Brazilian actions for the Decade of Ocean Science. The aim of this review is to contribute to a social solution-driven understanding of the ocean ecosystems, to create conditions to promote sustainable development and to secure a clean, healthy ocean. We are proposing a list of actions to be implemented by the Decade of Ocean Science that will have the pivotal role to promote technical and scientific capacity development, increase research infrastructure and institutional frameworks, develop national public policies aimed at reducing the input of pollutants and management of impacts, and warranting food security and ecosystem health. The earlier the actions in controlling pollutants are implemented, along with the identification of key sources and prevention of crossing of thresholds will help to avert worst-case scenarios, reducing the socio-economic disparities of impacts across nations and social groups and supporting the sustainable development of a pollutant-free ocean.

show abstract

“…Investigations focused on metal concentrations in different particle size fractions could provide more detailed information on their distribution mechanisms and ecological risk to aquatic environments. There are many studies on the relationship of heavy metal content and particle size distribution (PSD) in sediments [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] but conclusions obtained in these studies are very different. Some researchers indicated that metals tend to be present mainly in the fine sediment fraction [3][4][5][6]9] while others found no significant difference between metal content in the bulk and fine fraction [2,10].…”

Section: Introductionmentioning

confidence: 99%

“…The main argument was the formation of aggregates and metal-bearing organic matter and/or Fe/Mn-oxyhydroxide coatings on sand particles at locations affected by contamination [2] or the existence of the nearby mining areas which contribute to the accumulation of the certain element in the coarse fraction [11]. Likewise, in some studies metal concentrations were determined in fine fraction (<63 µm) [8,12], while the practice of separating the sand and performing the geochemical analysis in the fine fraction was not employed in others [9,13]. Besides grain-size correction, the geochemical normalization is found to be a promising tool for the investigation of metal contamination in river sediments [14,15], particularly for studying a single river systems.…”

Section: Introductionmentioning

confidence: 99%

Partitioning of Metal Contaminants between Bulk and Fine-Grained Fraction in Freshwater Sediments: A Critical Appraisal

2021

View full text Add to dashboard Cite

The distribution of six common metal contaminants (Cd, Cr, Cu, Ni, Pb, Zn) in the bulk (<2 mm) and fine fractions (<63 µm) of freshwater sediments was compared to conclude on the long-existing dilemma which fraction should be used in the investigation of the metal contamination. The environments included in the study (24 rivers, 8 lakes) were very different with respect to sediments origin and composition and they provided a good review of the possible scenarios. For the river sediments, particularly those having >40% of sand fraction, metal concentrations were up to seven times higher in the fine fraction, implying the necessity for considering sand dilution effect in compositional data analysis. The same samples were also characterized with higher organic matter content (OM) in the fine fraction. Lake environments were characterized by fine-grained sedimentation and the difference between metal concentrations in the bulk and fine fraction was not so expressed. The preparation of samples for the geochemical and compositional data mining should be carried out in accordance with the sedimentological characteristics of the investigated environment. It implies that the insight into geological setting and determination of sedimentological characteristics should be an obligatory part of monitoring/investigating metal contamination in freshwater sediments. For river sediments, the analysis of the fine sediment fraction or correction for sediment lithology are advisable.

show abstract

Toxic metal concentration and ecotoxicity test of sediments from dense populated areas of Congo River, Kinshasa, Democratic Republic of the Congo

Cited by 21 publications

References 43 publications

Assessment of Trace Metals in Sediments from Khnifiss Lagoon (Tarfaya, Morocco)

Assessment of Trace Metals in Sediments from Khnifiss Lagoon (Tarfaya, Morocco)

Pollutants in the South Atlantic Ocean: Sources, Knowledge Gaps and Perspectives for the Decade of Ocean Science

Partitioning of Metal Contaminants between Bulk and Fine-Grained Fraction in Freshwater Sediments: A Critical Appraisal

Contact Info

Product

Resources

About