Environmental Research, Journal Year: 2024, Volume and Issue: unknown, P. 120392 - 120392
Published: Nov. 1, 2024
Language: Английский
Environmental Science and Pollution Research, Journal Year: 2023, Volume and Issue: 31(2), P. 1719 - 1747
Published: Dec. 6, 2023
Language: Английский
Citations
11
Scientific Reports, Journal Year: 2024, Volume and Issue: 14(1)
Published: April 27, 2024
Abstract The indiscriminate disposal of spent engine oils and other hazardous waste at auto mechanic workshops clusters in Nsukka, Enugu State, Nigeria is an environmental concern. This study examines the concentration heavy metals soil inside workshop cluster unpolluted outside approximately 100 m. Ten sampling points were randomly selected from within another ten cluster. Using a hand-held Global Positioning System, coordinates established used to create digital map. Soil samples depths 0–30 cm 30–60 cm, analyzed for Cu, Fe, Zn, Pb, As Cd using Spectrophotometer. Moisture content determination particle size analysis also done on samples. Spatial variability concentrations studied site was mapped with ArcGIS 10.2.2 interpolation methods. Results showed that ranged sandy loam clay loam. Cadmium Zinc had lowest highest concentration, respectively, area. Comparing soils revealed notable differences across various (0–30 cm). results exhibited levels (mg/kg) ranging 0.716–0.751 (Cu), 2.981–3.327 (Fe), 23.464–30.113 (Zn), 1.115–1.21 (Pb), 2.6–2.912 (As), 0.133–0.365 (Cd) demonstrating variation pattern order Zn > Fe Pb Cu Cd. Conversely, cluster, 0.611–0.618 2.233–2.516 12.841–15.736 0.887–0.903 1.669–1.911 0.091–0.091 (Cd). To assess disparity metal between collected clusters, ANOVA test performed. significant difference ( p < 0.05), implying activities significantly impact compared areas. assessment pollution utilized indices including Geo-accumulation Index (Igeo), Contamination factor (Cf), anthropogenic (QoC). Zinc, Cadmium, Arsenic contamination factors, indicating likely due activities. WHO permissible limits while observed decrease as depth increased. 10.2.2, spatial maps showing distribution developed, Kriging method proving superior. suggests area be monitored regular basis.
Language: Английский
Citations
4
Environmental Research, Journal Year: 2025, Volume and Issue: 268, P. 120792 - 120792
Published: Jan. 8, 2025
Language: Английский
Citations
0
Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)
Published: Jan. 11, 2025
Abstract Limestone mining waste and its derived CaO were checked as an adsorbents of pb 2+ , Cu Cd ions from water solution. The characterization calcined limestone was studied by using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), Scanning Electron Microscope (SEM), Surface area measurements (BET). optimum conditions sorbent dosage, pH, initial concentration, contact time factors investigated for pristine absorbents. results indicate that the concentrations (C i ) 1200, 500, 300 ppm Pb, Cu, Cd, respectively, adsorbent, while corresponding 700, 110, 50 ppm. In ternary system sorption, indicated selectivity sequence metals can be expressed Pb > exhibits a higher compared to . Hence, various adsorption isotherm kinetic models examined explore different patterns behaviors adsorption. So, has great potential eliminating cationic heavy metal species industrial solutions.
Language: Английский
Citations
0
Separations, Journal Year: 2023, Volume and Issue: 10(8), P. 441 - 441
Published: Aug. 7, 2023
Heavy metals in water pose a great threat to human health, and treatment remains critical issue globally. Among various techniques, adsorption has been proven be an excellent way remove heavy from due its advantages, like low cost, availability, profitability, ease of operation, efficiency. such as chromium arsenic are present the form anions, while many common adsorbents, biochar activated carbons, cellulose, chitosan, clays, silica, tend acquire negative surface charge. The charge adsorbent plays major role interaction with metal ions. Polyethylenimine is polymer high cationic density. Modification these adsorbents polyethylenimine results higher selectivity for anions. capacity related efficiency introduction polyethylenimine, which depends on properties adsorbent. This review focuses effect modification removal ions, chromate arsenate, water.
Language: Английский
Citations
10
Modern Finance, Journal Year: 2025, Volume and Issue: 3(1), P. 50 - 66
Published: March 5, 2025
This study explores the spillover dynamics and interconnectedness among traditional energy markets, eco-friendly indices, strategic minerals under varying economic conditions. Quantile connectedness measures are employed to capture asymmetric effects across adverse (5th percentile), normal (median), boom (95th percentile) To ensure robustness, a Vector Autoregression (QVAR) framework is utilized validate findings. The results reveal significant heterogeneity: markets dominate as transmitters during periods, while indices exhibit balanced or dependent roles quantiles. Gasoline Tellurium emerge key in stressed conditions, whereas Coal Gas Oil play dominant bullish markets. These findings offer valuable insights into of market interdependence, emphasizing need for tailored risk management strategies. Academically, this contributes literature on connectedness, offering practical implications policy sustainable
Language: Английский
Citations
0
Physics and Chemistry of the Earth Parts A/B/C, Journal Year: 2025, Volume and Issue: unknown, P. 103898 - 103898
Published: March 1, 2025
Language: Английский
Citations
0
Minerals, Journal Year: 2024, Volume and Issue: 14(2), P. 135 - 135
Published: Jan. 26, 2024
Sediment samples from the Săsar River and its main tributaries were analyzed for their potentially toxic elements at site of Romplumb metallurgical company near well-known Pb-Zn-Cu epithermal deposit Baia Sprie located in Neogene volcanic chain Eastern Carpathians, Romania. The average metal concentrations arranged order decreasing abundance are as follows (mg·kg−1): Mn (4098) > Zn (2093) Pb (918) Cu (489) As (160) Cr (37.51) Ni (30.25) Co (28.13) Cd (9.72) Hg (1.81). Several pollution indices successfully used to assess degree contamination ecological risk. majority sampling sites indicate high degrees pollution, with two major hotspots identified. There further sources, such Șuior (Pb-Zn-Au) (Au-Ag) deposits, Cuprom company, Bozânta tailing ponds, identified contaminants. Mare mining district is causing a serious threat aquatic systems region, it can be taken reference area human impact derived mineral deposits Au-Ag-Cu-Pb-Zn. It imperative reduce risks thereby protect population living within this abandoned area.
Language: Английский
Citations
2
The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 926, P. 171717 - 171717
Published: March 13, 2024
Language: Английский
Citations
2
Applied Artificial Intelligence, Journal Year: 2024, Volume and Issue: 38(1)
Published: April 13, 2024
Water pollutions can severely affect water environment, causing quality degradation and threatening aquatic wildlife. Deemed as guideline for maximum environmental impact assessment, pollution peak concentration (WPPC) has been intensively studied to organize effective countermeasures. In this study, a back propagation artificial neural network (BPANN) coupled with genetic algorithm (GA) was constructed predict concentrations. Compared BPANN, multiple linear regressions model (MLRM) step-wise (SMLRM), GA-BPANN showed superior accuracy in both simulating predicting concentrations (R2 = 0.93 0.67 0.69 respectively). 12 cases, model's mean absolute relative error (MARE) ranges from 0.0 0.58, averaged at 0.09, significantly lower than MLRM SMLRM (MARE 0.29, 0.45 0.48). Further analysis revealed that be used an efficient tool simulation early warning prediction.
Language: Английский
Citations
2