The release of pollutants due to mining activities, especially tailings, has negative consequences on soil and affects agricultural productivity. This study details the assessment of metals (Ni, Mn, Pb, Cd and Fe), physicochemical parameters of the soil and how they affect metal bioavailability and biotoxicity. Metal concentrations were determined using Atomic Absorption Spectrophotometer (AA-6800 Shimadzu). The results of the analysis show that the mean pH varied from a minimum of 7.12±0.36 to a maximum of 7.60±0.28 across all the study area and sampling points. The percent organic matter had an average minimum value of 0.13±0.08% and a maximum value of 0.82±0.32% in the study area. The heavy metal analysis result shows that concentrations in all the soil and sediments of the study area were all below the maximum permissible limit.
Background: The release of environmental pollutants such as heavy metals due to mining activities has received worldwide condemnation. Therefore, understanding the contamination of both surface and groundwater in Edege-Mbeki mining district is very important for the health and wellbeing of its people. Hence, the purpose of this study was to determine the physicochemical parameters of water samples and the level of heavy metals in Edege-Mbeki Columbite/Tantalite (COLTAN) mining site, North Central Nigeria. Results: A total of 15 water samples were collected and analyzed in triplicate. The concentrations of five heavy metals (Ni, Mn, Pb, Cd, and Fe) in surface and groundwater samples were measured using atomic absorption spectrophotometer (AA-6800 Shimadzu). The physicochemical properties of the water samples were also examined. The results of the water quality assessments show that the water samples were contaminated with alarming levels of Pb, Cd and Ni. Mean concentrations were Ni (0.008 mg/L), Mn (0.087 mg/L), Pb (0.324 mg/L), Cd (0.029 mg/L), and Fe (0.839 mg/L) in Edege-Mbeki groundwater, while the surface water (mining ponds) had Ni (0.102 mg/L), Mn (0.099 mg/L), Pb (0.358 mg/L), Cd (0.025 mg/L), and Fe (6.99 mg/L). The groundwater samples in Mararaban-Edege which served as the control site had mean concentration levels of Ni (0.032 mg/L), Mn (0.096 mg/L), Pb (0.122 mg/ L), Cd (0.039 mg/L), and Fe (0.608 mg/L). The range of pH was found to be from 5.6 ± 0.02 to 6.5 ± 0.12, turbidity was between 39.27 ± 0.29 and 2271 ± 0.00 NTU, and conductivity ranged from 39.27 ± 0.29 to 757.33 ± 5.69 μS/cm, TDS from 25.0 ± 2.3 to 450.67 ± 6.03 mg/L while dissolved oxygen (DO) values from 3.1 ± 0.3 to 3.5 ± 0.3 mg/L. Conclusion: This study confirmed that surface and ground water samples in Edege-Mbeki and Mararaban-Edege are not fit for human consumption and other domestic use. Hence, government and community leaders must provide alternative means of water for the people of these communities.
Crude oil is predicted to become one of the most detrimental sources of anthropogenic pollution to the marine environment. To meet Nigeria's energy need, Dangote Industries Ltd. was granted licence to build a refinery in the Lekki Free Trade Zone in 2014. There is a significant risk of oil spill from the Single Point Mooring terminal of the refinery as it shares close proximity to the Lekki deep seaport, closeness to the shoreline, sensitive environmental receptors as well as social spots (beaches and resorts). To address this gap, this study aims to design a stochastic model for oil spill prediction for the SPM terminal in order to provide an understanding of the trajectory, fate and uncertainties of spilled oil at different environmental and hydrodynamic conditions. The GNOME software was used to model oil spill trajectory in the SPM terminal while ADIOS2 modelled Bonny light crude weathering characteristics. The best guess solution and the minimum regret analysis shows the possibility of oil beaching on the coastline of Lagos, Edo and Delta State as well as the Gulf of Guinea. The fate simulation for 5 days revealed that evaporation will account for 23% and 27% of oil loss in dry and wet season while dispersion will account for 1.3% and 1.6% in the same time period. Within the same time period, Bonny light crude will form a stable emulsion that will increase the viscosity and density of oil. Also, 66% and 59% of oil was remaining after 5 days, while airborne benzene concentration evaporated in 36 hours and 12 hours in the dry and wet season respectively. The results obtained in this research work suggest that, the window of opportunity need to be utilised by stockpiling equipment and mechanical responders for shoreline clean-up to avoid the oil possibly beaching along the Coastline of Lagos, Edo and Delta state as well as countries on the Gulf of Guinea.
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