Trace metals and persistent organic pollutants in sediments from river-reservoir systems in Democratic Republic of Congo (DRC): Spatial distribution and potential ecotoxicological effects

Mwanamoki, Paola M.; Devarajan, Naresh; Thevenon, Florian; Niane, Birane; Alencastro, Luiz Felippe De; Grandjean, Dominique; Mpiana, Pius T.; Prabakar, K.; Mubedi, Josué I.; Kabele, Christophe G.; Wildi, Walter; Poté, John

doi:10.1016/j.chemosphere.2014.04.083

Cited by 97 publications

(47 citation statements)

References 34 publications

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“…Strong correlations among Zn, Pb and Cd concentrations further support a common pollution source for these metals, while Cr was only correlated with Cu. With the exception of Cr, the strong positive correlation among heavy metals was similar with an investigation of a river-reservoir system in the Democratic Republic of Congo (Mwanamoki et al, 2014). The PCA analysis provides additional support for a common source of Zn, Pb and Cd as several species of these heavy metals demonstrated a significant loading weight on PC1.…”

Section: Distribution and Source Analysis Of Heavy Metal Speciationsupporting

confidence: 81%

“…Metal concentrations in the Wen-Rui Tang River sediments were also elevated compared to several other rivers and lakes locally and globally (Table S2): Cu 3e14 Â , Zn 4e36 Â , Pb 1.1e10 Â times, and Cd 4e880 Â times higher than the concentrations in these other watersheds. Heavy metal contaminations in river sediments were much severer than that in Congo, which was identified with slight heavy metal pollution (Mwanamoki et al, 2014;Kilunga et al, 2017). In contrast, Cr concentrations were at levels similar to sediments from Dong Ting Lake (China), Yangtze River (China) and Red River (Vietnam), but 20 times higher than that in the Sinú River (Colombia).…”

mentioning

confidence: 80%

“…The adverse impact of heavy metal pollution on aquatic ecosystems is especially severe in areas experiencing rapid urbanization and industrialization (Pan and Wang, 2012). Sediments can either release metals directly to the water column or serve as the source of metals for bioaccumulation/biomagnification in aquatic organisms, such as benthic fauna, shrimp and fish (Goretti et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Distribution and source analysis of heavy metal pollutants in sediments of a rapid developing urban river system

et al. 2018

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TitleDistribution and source analysis of heavy metal pollutants in sediments of a rapid developing urban river system. Heavy metal pollution of aquatic environments in rapidly developing industrial regions is of considerable global concern due to its potential to cause serious harm to aquatic ecosystems and human health. This study assessed heavy metal contamination of sediments in a highly industrialized urban watershed of eastern China containing several historically unregulated manufacturing enterprises. Total concentrations and solid-phase fractionation of Cu, Zn, Pb, Cr and Cd were investigated for 39 river sediments using multivariate statistical analysis and geographically weighted regression (GWR) methods to quantitatively examine the relationship between land use and heavy metal pollution at the watershed scale. Results showed distinct spatial patterns of heavy metal contamination within the watershed, such as higher concentrations of Zn, Pb and Cd in the southwest and higher Cu concentration in the east, indicating links to specific pollution sources within the watershed. Correlation and PCA analyses revealed that Zn, Pb and Cd were dominantly contributed by anthropogenic activities; Cu originated from both industrial and agricultural sources; and Cr has been altered by recent pollution control strategies. The GWR model indicated that several heavy metal fractions were strongly correlated with industrial land proportion and this correlation varied with the level of industrialization as demonstrated by variations in Chemosphere 207 (2018) 218e228 local GWR R 2 values. This study provides important information for assessing heavy metal contaminated areas, identifying heavy metal pollutant sources, and developing regional-scale remediation strategies.

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Section: Distribution and Source Analysis Of Heavy Metal Speciationsupporting

confidence: 81%

mentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

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Distribution and source analysis of heavy metal pollutants in sediments of a rapid developing urban river system

et al. 2018

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“…PCBs have been detected in freshwater, wastewater and sediments in different parts of the world (Zhang et al 2003Sapozhnikova et al 2004;Katsoyiannis and Samara 2004). Their presence in the environment is often related to surrounding activity in the area where they are found (Mwanamoki et al 2014;Verhaert et al 2013). Due to their various environmental hazards, they were banned by the United States Congress and the Stockholm Convention in 2001 and are included in the list of priority pollutants to be regularly analysed and monitored (USEPA 1996).…”

Section: Introductionmentioning

confidence: 99%

Occurrence and significance of polychlorinated biphenyls in water, sediment pore water and surface sediments of Umgeni River, KwaZulu-Natal, South Africa

Gakuba

Moodley

Ndungu

et al. 2015

Environ Monit Assess

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The Umgeni River is one of the main sources of water in KwaZulu-Natal, South Africa; however; there is currently a lack of information on the presence and distribution of polychlorinated biphenyls (PCBs) in its sediment, sediment pore water and surface water. This study aims to determine the occurrence and significance of selected PCBs in the surface water, sediment pore water and surface sediment samples from the Umgeni River. Liquid-liquid and soxhlet extractions were used for water or pore water, and sediments, respectively. Extracts were cleaned up using a florisil column and analysed by gas chromatography-mass spectrometry. The total concentrations of eight polychlorinated biphenyls were 6.91-21.69 ng/mL, 40.67-252.30 ng/mL and 102.60-427.80 ng/g (dry weight), in unfiltered surface water, unfiltered sediment pore water and surface sediments, respectively. The percentage contributions of various matrices were 4, 36 and 60 % for unfiltered surface water, unfiltered pore water and sediment, respectively. The highest concentrations of PCBs were found in water, pore water and sediment collected from sampling sites close to the Northern Wastewater Treatment Works. The highest chlorinated biphenyl, PCB 180, was the most abundant at almost all sampling sites. To our knowledge, this is the first report on occurrence of polychlorinated biphenyls in the Umgeni River water, pore water and sediment system and our results provide valuable information regarding the partitioning of the PCBs between the water and sediment systems as well as the organic chemical quality of the water.

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“…The River Congo similarly flows through densely populated cities, notably Kinshasa (14.12 million inhabitants) and Brazzaville (2.21 million), and these waters would also be suspected of having MPs present. Elevated trace metal concentrations in Congo sediments were found in the vicinity of urban runoff and domestic and industrial wastewater discharge into the river basin [72]. It would seem obvious to expect MPs to be present alongside other pollutants of urban origin in both these rivers.…”

Section: Future Research Needsmentioning

confidence: 99%

Microplastics in Inland African Waters: Presence, Sources, and Fate

Khan

Mayoma

Biginagwa

et al. 2017

The Handbook of Environmental Chemistry

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As the birthplace of our species, the African continent holds a unique place in human history. Upon entering a new epoch, the Anthropocene defined by human-driven influences on earth systems, and with the recognition that plastic pollution is one of the hallmarks of this new age, remarkably little is known about the presence, sources, and fate of plastics (and microplastics (MPs)) within African waters. Research in marine regions, most notably around the coast of South Africa, describes the occurrence of MPs in seabirds and fish species. More recently environmental sampling studies in the same area have quantified plastics in both the water column and sediments. However, despite Africa containing some of the largest and deepest of the world's freshwater lakes, including Lakes Victoria and Tanganyika as part of the African Great Lakes system, and notable freshwater rivers, such as the River Congo and the Nile, the extent of MPs within the inland waters remains largely unreported. In the only study to date to describe MP pollution in the African Great Lakes, a variety of polymers, including polyethylene, polypropylene, and silicone rubber, were recovered from the gastrointestinal tracts of Nile perch (Lates niloticus) and Nile tilapia (Oreochromis niloticus) fished from Lake Victoria. The likely sources of these plastics were considered to be human activities linked to fishing and tourism, and urban waste. In this chapter we discuss the need for research focus on MPs in Africa and how what has been described in the coastal regions and other freshwater environments can be applied to inland African waters. The aforementioned study in Lake Victoria is used to exemplify how small-scale investigations can provide early indications of MP pollution. Lastly we discuss the current challenges and future needs of MP research in African freshwaters.

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Trace metals and persistent organic pollutants in sediments from river-reservoir systems in Democratic Republic of Congo (DRC): Spatial distribution and potential ecotoxicological effects

Cited by 97 publications

References 34 publications

Distribution and source analysis of heavy metal pollutants in sediments of a rapid developing urban river system

Distribution and source analysis of heavy metal pollutants in sediments of a rapid developing urban river system

Occurrence and significance of polychlorinated biphenyls in water, sediment pore water and surface sediments of Umgeni River, KwaZulu-Natal, South Africa

Microplastics in Inland African Waters: Presence, Sources, and Fate

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