Heavy Metal Pollutions and Its Associated Ecological Risks in Lagos Lagoon Sediments, South-western Nigeria

Ekaete, Ajani Gloria; Ibironke, Oshisanya Khaphilah; Olatunde, Popoola Samuel; Olaoye, Oyeleke Peter

doi:10.9734/acsj/2015/20334

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…The quality of water has been under great attack due to oil exploration and exploitation in the Niger Delta Region of Nigeria. Poor water quality and pollution arose as a result of the rise in industrial and agricultural activities, population growth and urbanization [1]. Organisms or certain species may be eliminated at certain level of pollution due to their inability to withstand stress [2].…”

Section: Introductionmentioning

confidence: 99%

Total Petroleum Hydrocarbons Contamination of the Surface Water and Sediments of Orashi River, Engenni, Ahoada West, Rivers State, Nigeria

Edori

Bekee²

2021

AREES

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The level of contamination of Orashi River by total petroleum hydrocarbons were investigated through the collection of surface water samples and sediment samples from four locations along the river. Determination of the level of contamination was done with the use of gas chromatography-flame ionization detector after following laid down clean-up procedures. The results obtained showed that total petroleum hydrocarbons in the surface water were 10.913±2.2022mg/L, 7.645±2.683mg/L, 9.074±2.1654mg/L and 12.212±3.3034mg/L for stations 1, 2, 3 and 4 respectively with a mean value of 9.961±2.5885mg/L, while in the sediment samples concentration values recorded were 22.3925±5.2104mg/Kg, 35.1071±9.9652mg/Kg, 50.4431±15.9916mg/Kg and 29.3869±8.0410mg/Kg for stations 1, 2 3 and 4 respectively with a mean value of 34.3324±9.8021mg/Kg. The partition coefficient calculations revealed that the sediment phase is more stable for total petroleum hydrocarbons as compared to the water phase. The analysis of the randomly collected samples revealed that total petroleum hydrocarbons have contaminated the river and therefore adequate steps should be taken to remedy the present condition of the Orashi River in order to mitigate any probable rise in the quantity of total petroleum hydrocarbons in the river above allowable limit.

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Section: Introductionmentioning

confidence: 99%

Total Petroleum Hydrocarbons Contamination of the Surface Water and Sediments of Orashi River, Engenni, Ahoada West, Rivers State, Nigeria

Edori

Bekee²

2021

AREES

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“…5 No. 1 (2021), 159-173 161 dredging and thermal pollution (Ajani et al [1], Popoola et al [11,12], Olaniyi and Popoola [9], Ajani et al [2]). The Lagos Harbour, within the commodore channel, has witnessed series of ocean forcing of tides and waves, and the accompanying high salinity values and electrical conductivity based on sea water incursion and proximity to the sea (Olaniyi and Popoola [9], Ajani et al [2]).…”

Section: Introductionmentioning

confidence: 99%

Seasonal Variation on the Hydrochemistry and Height of Brackish-Water from Commodore Channel, Lagos, Nigeria

Popoola¹,

Unyimadu²,

Nubi³

et al. 2020

EJCS

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The current study deals with the evaluation of physicochemical characteristics, nutrient status, and variation in the height of surface water from the commodore channel, and its comparison with the hydrochemical characteristics of the monitoring borehole from the NIOMR Jetty, Lagos, Nigeria. We aim to further improve our understanding of the interrelationship of climate change and hydrological cycle, and its impacts in the Lagos coastal environments. The observed ranges of physicochemical characteristics of the surface water are dissolved oxygen (DO) 3.07-6.05mg/L; pH: 7.99-8.48; temperature 26.97-30.34°C, electrical conductivity (EC) 9680-47800mS/cm; salinity (Sal) 6.51-28.05‰ and water level 1.24-1.79m. The concentration of nutrient range from nitrite 10-36mg/l, nitrate 28-44mg/l, sulphate 38-90mg/l and phosphate 2-78mg/l. The analyzed hydrochemical characteristics from all the stations are within the desired values for healthy marine ecosystems when compared with Federal Ministry of Environment (FMENV) Nigeria permissible limits which are: DO >5 mg/l, pH 6.5-9, temperature <40°C, nitrite 1mg/l, nitrate 20mg/l, phosphate 5mg/l and sulphate 500mg/l; except low DO (<4.5mg/l) in January, November and December, and elevated nitrite, nitrate and phosphate values across the season. The low DO values may be attributed to enhanced transportation of non-biodegradable organic loads that utilize the available DO for chemical oxidation and microbial decomposition. While the enriched nitrite, nitrate and phosphate concentrations suggest enhanced productivity and influx of nutrients rich flood water from the anthropogenic source. Our study showed a coincidence in the highest brackish water height of the surface water (1.24m) from the commodore channel with the highest groundwater level (1.58m) in October. The lowest height of water levels was recorded in February and March at 2.23m and 1.79m for groundwater and surface water respectively. The similarities in the height of water levels were recorded with contrasting hydrochemical variables (e.g., high Ec vs. low Ec; and high Sal vs. low Sal), which confirmed the effect of rainfall/freshwater incursion on the surface water and simultaneous occurrence of subsurface pollution arising from seawater intrusion on the groundwater samples in October. This study had shown that a long term monitoring of rise in water levels and hydrochemical variables of surface and groundwater can be used to understand climate change and early warning predictions of flooding in coastal environments.

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“…Sediment quality values are useful to screen the potential for contaminants within sediment to induce biological effects and compare sediment contaminant concentration with the quality guideline (Speneer & Macleod 2002). In the last decade, several researchers (Abrahim & Parker 2008;Nobi et al 2010;Ghrefat et al 2011;Ladigbolu & Balogun 2011;Ajagbe et al 2012;Ekaete et al 2015) reported moderate to high concentrations of heavy metal contaminants in river sediments. Caeiro et al (2005) also observed that different assessment indices for the aquatic environment have been developed and these are powerful tools for development, evaluation and conveying raw environmental information to decision makers, managers and water stakeholders.…”

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confidence: 99%

Multivariate analysis of sediment quality in River Ogbere, Ibadan, South-West Nigeria

et al. 2021

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Heavy metals are pollutants of river sediments, and their concentration varies depending on parental material and anthropogenic inputs, thus important to distinguish between the natural and anthropogenic inputs. The objective of this study is to use different types of indexes to assess the current pollution status in Ogbere River sediment and select the best index to describe the sediment quality. The indexes used in this study were enrichment factor (EF), geoaccumulation index (Igeo) and principal component analysis (PCA). The PCA has an advantage over other index analyses as it reduces the dimensionality of the data set and thus used to support multivariate cluster analysis. From the study, a total of 12 sediment samples were collected in both seasons across six sampling location and pollution indexes indicated three things: firstly, the metal distribution profile in the sediment showed that the heavy metals analysed for were lower than the maximum allowable limits stipulated by Department of Petroleum Resources (DPR); secondly, minor to extremely severe significant levels of enrichment and thirdly, practically uncontaminated to a moderately contaminated degree of contamination in Ogbere River during the study period. The PCA is considered more sensitive in the analysis of benthic changes and as well as sediment quality. However, the heavy metal assessment indices are not only used for sediment quality. Biological testing and ecological analysis of existing community related to sediment contamination are further recommended in River Ogbere.

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Heavy Metal Pollutions and Its Associated Ecological Risks in Lagos Lagoon Sediments, South-western Nigeria

Cited by 8 publications

References 12 publications

Total Petroleum Hydrocarbons Contamination of the Surface Water and Sediments of Orashi River, Engenni, Ahoada West, Rivers State, Nigeria

Total Petroleum Hydrocarbons Contamination of the Surface Water and Sediments of Orashi River, Engenni, Ahoada West, Rivers State, Nigeria

Seasonal Variation on the Hydrochemistry and Height of Brackish-Water from Commodore Channel, Lagos, Nigeria

Multivariate analysis of sediment quality in River Ogbere, Ibadan, South-West Nigeria

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