Downstream hydraulic geometry across headwater channels in Upper Ogun River Basin, Southwestern Nigeria

Olusola, Adeyemi; Fashae, Olutoyin Adeola; Onafeso, Olumide

doi:10.1080/19376812.2020.1720756

Cited by 10 publications

(2 citation statements)

References 34 publications

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“…The Ogun River is in the southwestern part of Nigeria. It is the largest and longest river in southwest Nigeria, with the characteristics of a tropical climate (Adeyemi et al, 2020). It flows from Igboho in Oyo State through Abeokuta and Isheri in Ogun State and empties into the Lagos Lagoon at Ikorodu.…”

Section: Methodsmentioning

confidence: 99%

Predicting Metal Bioavailability and Risk of Toxicity in Nigerian Surface Waters: Are the Existing User‐Friendly Bioavailability Tools Applicable?

Bawa-Allah

Bulama

Hamzat

et al. 2022

Enviro Toxic and Chemistry

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In the present study, we assessed the use of existing user‐friendly bioavailability tools to predict metal bioavailability and the risk of toxicity in a typical Nigerian surface water. The effect of prevailing water chemistry on toxicity of metals was also assessed in laboratory studies. Surface water samples were collected at four locations downstream in the Ogun River in Lagos State, and water chemistry analysis was carried out using standard methods. Relevant parameters were inputted into the Bio‐Met software and Metal Bioavailability Assessment Tool (M‐Bat), which are run on a Microsoft Excel spreadsheet, to obtain the site‐specific hazardous concentrations affecting 5% of the population (HC5)/predicted‐no‐effect concentrations (PNECs) for selected metals and risk characterization ratios (RCRs) at locations downstream in the river. Assessments using the bioavailability tools showed that two locations, Owode‐Onirin and Kara, were more sensitive to Zn and Pb inputs compared to the other locations. The RCRs for Cu, Zn, and Pb, respectively, were >1 at all locations, indicating a potential risk of toxicity to aquatic life. Results from laboratory studies conformed with predictions from the bioavailability tools because Zn and Pb were more toxic to aquatic organisms in surface water collected from Owode‐Onirin and Kara locations, respectively, compared to toxicity in surface water from other locations. The issue of bioavailability in metal pollution control is widely accepted and has been incorporated into water quality guidelines (WQGs) in the United States, the United Kingdom, and Europe. In the absence of regulations incorporating bioavailability in developing countries including Nigeria, it is essential to assess the applicability of existing methods incorporating bioavailability to surface waters in this region. Findings from such studies will facilitate the development of region‐specific WQGs for metals which will be protective of locally relevant aquatic life. Environ Toxicol Chem 2022;41:2537–2547. © 2022 SETAC

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Section: Methodsmentioning

confidence: 99%

Predicting Metal Bioavailability and Risk of Toxicity in Nigerian Surface Waters: Are the Existing User‐Friendly Bioavailability Tools Applicable?

Bawa-Allah

Bulama

Hamzat

et al. 2022

Enviro Toxic and Chemistry

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“…The Ogun River Basin is one of the significant coastal basins located in southwestern Nigeria [60][61][62]. The basin is situated between latitudes 6° 26' N and 9° 10'N and longitudes 2° 28'E and 4° 8 'E (Figure 11).…”

Section: The Ogun River Basinmentioning

confidence: 99%

Detailed Hydrogeological and Hydrochemical Reassessment of Coastal Basins of Southwestern Nigeria

2021

Geol Earth Mar Sci

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prolonged residence time in the aquifer and saltwater intrusion account for the variability of hydrochemistry of groundwater in coastal aquifers [1,[11][12][13][14]. The hydrochemistry of coastal aquifers of southwestern Nigeria is highly variable due to variation in geological configurations and human activities. Groundwater contamination stemming from human activities, and inadequate sewage discharge is on the rise in Nigeria [15][16][17]. Consequently, groundwater utilized for domestic uses is problematic and hence calls for scientific scrutiny. Examining hydrochemistry and groundwater quality in coastal regions is crucial to monitor and detect groundwater contaminants sources [18][19][20][21]. Groundwater quality analysis in Abeokuta South, Nigeria by Emenike, Nnaji [17] showed that water quality parameters exhibited wide variations from location to location. Sodium, magnesium, iron (++), and EC showed the most violation of drinking water quality standards. Anthropogenetic actions are escalating threat to groundwater quality and thus call for routine monitoring of groundwater in Abeokuta. Statistical and hydrochemical modelling of groundwater quality southwestern Nigeria showed a conjunctive imprint of anthropogenic and geogenic activities influencing the increasing dissolved chemical constituents in the groundwaters

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Geomorphological Analyses of Third-Order Basins in Southwestern Nigeria

Olusola

Onafeso

Fashae

et al. 2022

Geography of the Physical Environment

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Downstream hydraulic geometry across headwater channels in Upper Ogun River Basin, Southwestern Nigeria

Cited by 10 publications

References 34 publications

Predicting Metal Bioavailability and Risk of Toxicity in Nigerian Surface Waters: Are the Existing User‐Friendly Bioavailability Tools Applicable?

Predicting Metal Bioavailability and Risk of Toxicity in Nigerian Surface Waters: Are the Existing User‐Friendly Bioavailability Tools Applicable?

Detailed Hydrogeological and Hydrochemical Reassessment of Coastal Basins of Southwestern Nigeria

Geomorphological Analyses of Third-Order Basins in Southwestern Nigeria

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