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- Title
Trace Metals and TPH Assessment of Drill Cuttings from the Vicinity of the South-Bank Estuary Oil Facility in Forcados, Nigeria.
- Authors
Ohwoghere-Asuma, Oghenero; Ovwamuedo, Glory; Akpoborie, Tony Irwin
- Abstract
Surficial soils in the Niger delta have been studied to be contaminated by activity of oil exploration and exploitation companies. The contaminated status of aquifer sediments below the static water levels is scarcely known and unavailable. As a result, drill cuttings collected from eleven dedicated shallow boreholes were screened for total petroleum hydrocarbon and selected trace metals. The results showed that sediments sampled at 0.5m (top), 3m (middle), and 7m (bottom) intervals returned total Petroleum hydrocarbon (TPH) concentrations in the order, 20.9-14,942mg/kg > 18.6-2,045mg/kg > (0-1,043.2mg/kg). The trace metals of Zn, Cu, Pb and Co loading is such that the top > middle> bottom, Cd, Mn and Ni loading in top > middle < bottom, Fe in top (40.83-450 mg/kg) > Middle (76.73- 560.45)> bottom (110-587.4), Cr in top (0.03-1.08) < middle (0.03-1.10) < bottom (0.01-1.15) and no significant change in the concentration of V across all depths. TPH and trace metal loading appeared to be higher and lower than the DPR-EGASPIN desirable limit. The concentrations of TPH in subsurface sediments in some areas indicated contamination of aquifer sediments at depth of 0.3 to 7m deep. There is a spatial variation of trace metals and TPH concentrations with depths, which suggests that contaminated of surficial soils over time remained continuous source of the deeper depths contamination. Factor analysis of trace metals and TPH suggests multiple sources of estuary sediment contamination, including geogenic sources of leaching and weathering of rocks enriched in these trace metals carried by flowing rivers and deposited in estuary sediments. Anthropogenic sources include oil spillage, gas flaring, and fossil fuel combustion near an oil facility.
- Subjects
FORCADOS River (Nigeria); TRACE metals; BOREHOLES; WEATHERING; FOSSIL fuels
- Publication
Jordan Journal of Earth & Environmental Sciences, 2023, Vol 14, Issue 4, p297
- ISSN
1995-6681
- Publication type
Article