Distribution, source apportionment and ecological risk assessment of heavy metals in Limbe River sediments, Atlantic Coast, Cameroon Volcanic Line

Discover Water, Journal Year: 2024, Volume and Issue: 4(1)

Published: Aug. 28, 2024

The objective of this research was to assess sediments contamination, provenance and metal pollution using single complex indicators. Limbe River sediment samples were analysed Inductively Coupled Plasma—Mass Spectrometry. exhibit high content in Fe2O3 sourced from haematization basaltic rocks. concentration Cd, Co, Cr, Mn, Ni, Pb, Sn, Sr, V Zn exceed upper continental crust local baseline values for heavy metals. Correlation matrix analysis indicates the presence common input sources similar geochemical characteristics Contamination factor (CF: 0.01–10.34), contamination degree (Cdeg: 14.91–36.57), load index (PLI: 0.84–1.77), nemerow integrated (NIPI: 0.2–1.7) significant levels contamination. enrichment (EF: 0–5.67) geo-accumulation (Igeo: -7.55–2.59), suggests moderate ecosystem, suggesting potential ecological effects. Modified hazard quotient (mHQ: 0.082–6.35) toxic risk (TRI: 10.49–27.43), low extreme severity toxicity risks metals aquatic ecosystem fauna flora. Primarily anthropogenic activities secondary lithogenic is attributed pollution. This study that a greater emphasis should be placed on monitoring various provenances entering practices. emphasizes significance continual protection biological resources adaptive management. development reasonable goals remedial programmes can aided by data.

Language: Английский

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Removal of heavy metals in subsurface flow constructed wetlands: Application of effluent recirculation

Environmental and Sustainability Indicators, Journal Year: 2021, Volume and Issue: 12, P. 100146 - 100146

Published: Aug. 30, 2021

This study reports four heavy metals, i.e., Zinc (Zn), Chromium (Cr), Nickel (Ni), and Lead (Pb) removal from landfill leachate employing two-hybrid subsurface flow constructed wetland systems; each system included a vertical (VF) followed by horizontal (HF) wetland. The systems were packed with organic (coco-peat) or construction (brick, sand) materials planted Phragmites australis Chrysopogon zizanioides (Vetiver). Both operated under without, effluent recirculation protocols. Cr, Ni, Pb concentration 2–73 mg/kg, 3–12 0.00004–27 respectively in Phragmites; 8–34 3–15 0.00004–14 Vetiver. Organic carbon (C) iron (Fe) of the coco-peat, brick allowed media-based metals VF wetlands; such accumulation was not quantified sand-based HF wetlands. Zn, percentages increased between 75 98%, 29 41%, 14 48%, 23 26%, respectively, wetlands during period (compared performances without phase). Removal reduced period. Overall, ranged 20 97%, 95 99%, 55 73%, 69 83%, respectively.

Language: Английский

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Microbial diversity in intensively farmed lake sediment contaminated by heavy metals and identification of microbial taxa bioindicators of environmental quality

Scientific Reports, Journal Year: 2022, Volume and Issue: 12(1)

Published: Jan. 7, 2022

Abstract The cumulative effects of anthropogenic stress on freshwater ecosystems are becoming increasingly evident and worrisome. In lake sediments contaminated by heavy metals, the composition structure microbial communities can change affect nutrient transformation biogeochemical cycling sediments. this study, bacterial archaeal under fish pressure with metals were investigated Illumina MiSeq platform. Despite similar content most in lagoon sediments, we found that their different diversity composition. This difference would be determined resilience or tolerance to metal enrichment gradient. Thirty-two phyla 66 classes identified sediment from three lagoons studied. highest percentages contribution differentiation presented Alphaproteobacteria (19.08%), Cyanophyceae (14.96%), Betaproteobacteria (9.01%) y Actinobacteria (7.55%). bacteria predominated high levels Cd As Deltaproteobacteria, Actinobacteria, Coriobacteriia, Nitrososphaeria Acidobacteria (Pomacocha), Alphaproteobacteria, Chitinophagia, Nitrospira Clostridia (Tipicocha) (Tranca Grande). Finally, results allow us expand current knowledge identify bioindicators taxa environmental quality used monitoring control contamination.

Language: Английский

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Identification of the sources and influencing factors of the spatial variation of heavy metals in surface sediments along the northern Jiangsu coast

Ecological Indicators, Journal Year: 2022, Volume and Issue: 137, P. 108716 - 108716

Published: March 4, 2022

Determining the sources and factors influencing spatial variation of heavy metals in surface sediments tidal flats is important for controlling reducing metal pollution. We used principal component analysis partial least square regression to analyse distribution characteristics, sources, nine (As, Co, Cr, Cu, Mn, Ni, Pb, V, Zn) along four sites located on northern Jiangsu coast. Our results indicate that three sampling areas had a high content, whereas southern area low content. The Mn Pb are related both natural anthropogenic V Cr primarily derivatives human activities, As, Zn result processes. was affected by total inorganic carbon clay content (positive affect) as well sand silt (negative affect). silt, clay, phosphorus influence) influence). In addition, influenced organic effect) pH effect). grain size plays an role flats, with fine-grained materials being enrichment metals. our study control reduction pollution coastal sediments, protecting ecological environment health.

Language: Английский

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Replacing chemical fertilizers with organic and biological ones in transition to organic farming systems in saffron (Crocus sativus) cultivation

Chemosphere, Journal Year: 2022, Volume and Issue: 307, P. 135537 - 135537

Published: July 15, 2022

To evaluate the response of saffron to animal manure, and biological chemical fertilizer in an arid climate, experiment was performed as split plots based on a randomized complete blocks design with three replications during consecutive crop growth seasons (2015-2018) at Research Farm University Gonabad, Iran. The experimental treatments included application (60 t ha-1) non-application (control) manure main plot use biosulfur (5 kg ha-1), biophosphate (3 L nitroxin (150, 100, 100 ha-1 urea, triple superphosphate, potassium sulfate, respectively), no sub-plot. results showed highly significant quantitative traits which increased leaf, flower, corm indices by mean 15.1-35.7% than control. interaction effect fertilizers for weeds significant. There difference between biophosphorus most mentioned years. simultaneous these average about 60, 105, 135, 110, 165, 55% leaf dry weight, number flowers, fresh flower yield, stigma weed weight saffron, respectively compared or terms related so fertilizers, control, replacement size, bud per by, respectively, 35, 40% average. improved content crocin, picrocrocin, safranal stigma. best were obtained from although observed this treatment treatments. Overall, three-year show very high plant and, therefore, it is possible replace organic cultivation implement agriculture achieve acceptable qualitative yields areas similar location.

Language: Английский

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