Spatial and Seasonal Assessment of Heavy Metals in Surface Waters of the Middleton River in the Niger Delta, Nigeria

Aigberua, Ayobami Omozemoje; Tarawou, Timi; Abasi, Cyprian Y.

doi:10.11648/j.ijnrem.20170205.12

Cited by 8 publications

(9 citation statements)

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“…Heavy metals distribution in the area was in the order; iron > zinc > chromium > lead > copper > nickel > cadmium. Similarly, the concentration of heavy metals in the study area is close to values previously reported in cassava mill effluents contaminated soil in a rural community in the Niger Delta, Nigeria by Izah et al, 20 In addition, values were within the range reported in sediments of the Nun River in the Niger Delta as reported by Aigberua et al, 54,55 Metal concentrations reflected high level of spreading across the various locations. The coefficient of variation (C.V) was very high for the individual heavy metals viz: zinc (73.96%), lead (84.45%), cadmium (38.06%), copper (94.12%), chromium (112.47%), nickel (71.35%) and iron (69.90).…”

Section: Resultssupporting

confidence: 89%

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2020

BIJ

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This study evaluated the geochemical distribution and environmental risk of heavy metals such as cadmium, chromium, iron, zinc, nickel, copper and lead in the Taylor creek within the Niger Delta region of Nigeria. The sediment samples were analyzed by flame atomic adsorption spectrometry. The environmental risk was assessed via standard protocol, using two background scenarios (geometric and median mean). The distribution of heavy metals in the sediment was in the order; iron>zinc>chromium>lead>copper>nickel>cadmium. The cluster analysis, pollution load index, quantification of contamination and geoaccumulation index showed a higher degree of contamination for sediments of Obunagha 2, Okolobiri (1&2) and Ogboloma (1&2). All metals depicted a low risk index even though values were higher in Obunagha 2, Okolobiri (1&2) and Ogboloma (1&2), and lowest in Obunagha 1 and Polaku (1&2). Also, the ecological risk showed moderate contamination for cadmium in some locations. The findings of this study showed that anthropogenic activities along the bank of the Taylor creek is having an influence on the sediment heavy metals which is key in determining the survival rate of benthic fauna and other aquatic organism.

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Section: Resultssupporting

confidence: 89%

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2020

BIJ

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“…The tidal nature of the river allows for the run-off of spilt crude into surrounding freshwater; this spilt crude sometimes emanate from the activities of bunkers within the environment, hence, it is not unusual to observe oil sheen on the water surface. As is typical of most communities living along the river shorelines in the Niger Delta region, other forms of indiscriminate and uncontrolled municipal discharges negatively impact on the overall quality of the aquatic environment (Aigberua et al, 2017). The predominant occupation of the inhabitants of Azuzuama community is majorly fishing and farming, the study area and sample locations are as shown in Figure 1.…”

Section: Study Areamentioning

confidence: 99%

“…Zinc: During the dry season, the distribution of zinc in sediment revealed that residual (31.7%) and water soluble (27.2%) were the most predominant fractions. This may have been partly responsible for the bioavailable concentrations of zinc in surface waters of the Middleton River (Aigberua et al, 2017). On the other hand, the wet season depicted mostly the immobile fractions as the residual (42.6%) and crystalline Fe-oxide (16.6%) were mostly predominant (Table 1).…”

Section: Heavy Metals Fractionation Patterns: Chromiummentioning

confidence: 99%

“…During these activities, oil spills into nearby environment (that is, soil, water and sediment). Oil spill incidence is caused by several factors including vandalism and rupture of pipeline (Aigberua et al, 2017). About 95% of the population of the Okrika people who live along the Okrika River and its estuaries solely depend on groundwater for their domestic uses since their surface water sources are severely polluted by the direct discharge of domestic and industrial effluents and wastes into them (Tamunobereton-ari et al, 2011).…”

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Effect of Oxidation-Reduction Fluctuations on Metal Mobility of Speciated Metals and Arsenic in Bottom Sediments of Middleton River, Bayelsa State, Nigeria

Ao¹,

Tarawou²,

Abasi³

2018

Journal of Applied Sciences and Environmental Management

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Speciation and chemical mobility of heavy metals were assessed with a view to provide information on bioavailability of metals in a sediment matrix in order to account for the vulnerability of sediment dwelling fauna within the Middleton river ecosystem. Sediment was collected in triplicate from seven locations (five reflecting activities of oil installations in the study area and two controls). Sediments were collected in the months of March and August 2017 to reflect the dry and wet seasons respectively. Concentration of metals in each fraction was determined using a GBC Avanta Atomic Absorption Spectrophotometer. The residual fraction was the most important for Cr with average levels of (49.4%) and (41.1%) for the dry and wet seasons respectively. Also, the most prevalent fractions of Zn were the residual fractions which revealed (31.7%) and (42.6%) during the dry and wet seasons respectively. The metalloid (As) had (14.7%) and (13.8%) of its total concentration bound to the residual and crystalline Fe-oxide fractions during the dry and wet seasons respectively. The oxidation-reduction potential (ORP) was measured electrometrically using a redox potential meter; ORP ranged from (+288.67 to +351.33 mV) and (+331.00 to +465.67 mV) for the dry and wet seasons respectively, hence, depicting a fairly oxidizing sediment environment. Mobility factor of metals depicted (As > Cu > Cr) and (As > Cr > Cu) for the dry and wet seasons respectively. The effect of oxidation-reduction potential on metal mobility revealed the transportability of chromium with increasing redox potential while arsenic was barely mobile with increasing oxidation level. Also, zinc mobility diminished strongly with increasing oxidation-reduction potential.

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“…In addition, other forms of indiscriminate and uncontrolled municipal discharges negatively impact on the overall quality of the aquatic environment. 22…”

Section: Study Areamentioning

confidence: 99%

Soil organic matter: application for heavy metal source diagnostics in sediments of the Middleton River, bayelsa state, Nigeria

Ao¹

2018

MOJT

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The chemical species of metals (Fe, Ni and Pb) in the Middleton River were determined and their relationship with soil organic matter was established with a view to identifying the likely source (natural or anthropogenic) of these metals within the water body. The GBC Avanta PM AAS was used to quantify the levels of metals in each fraction. The most important fractions of iron, nickel and lead were found to be the poorly mobile and immobile metal species. The metals were most affiliated to the residual fractions thereby depicting that they are from the natural environment. However, the dry season depicted the tendency for nickel and lead to become bioavailable and potentially toxic as significant levels of the metals were superficially adsorbed on the surface of sediment colloids where they are readily redistributed within the water column as water soluble fractions. Sediment organic matter in the Middleton River may be mainly composed of soluble fulvic acids which may have aided metal desorption. The order of prevalence for metal speciation in the dry season was organic matter bound (24.7%), residual (67.6%) and organic matter bound fraction (34.3%) for iron, nickel and lead respectively. The wet season revealed the prevalence of amorphous Fe-oxide (28.6%), residual fraction (78.0%) and organic matter bound fraction (30.4%) for iron, nickel and lead respectively, thereby, portending that the metals are emanating from the natural environment. On the other hand, the readily transportable water soluble fractions depicted significant metal retention levels of (19.1%) and (12.5%) for nickel and lead during the dry season thereby portending the contribution of anthropogenic inputs; most likely from activities of oil bunkers, occasional oil spill from worn-out pipeline joints and boat transportation. Metal mobility factors depicted the trends (Ni>Pb>Fe) for the impacted areas across the dry and wet seasons. The control locations also depicted (Pb>Ni>Fe) and (Ni>Fe>Pb) during the dry and wet seasons respectively. Overall, Ni and Pb may possess the most potential to be bioavailable in the Middleton River estuary.

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Spatial and Seasonal Assessment of Heavy Metals in Surface Waters of the Middleton River in the Niger Delta, Nigeria

Cited by 8 publications

References 5 publications

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Effect of Oxidation-Reduction Fluctuations on Metal Mobility of Speciated Metals and Arsenic in Bottom Sediments of Middleton River, Bayelsa State, Nigeria

Soil organic matter: application for heavy metal source diagnostics in sediments of the Middleton River, bayelsa state, Nigeria

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