Heavy metals and organisms in the Lagos Lagoon

Okoye, Benedict C. O.

doi:10.1080/00207239108710641

Cited by 59 publications

(35 citation statements)

References 7 publications

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“…Okoye (1991) reported the level of Pb to be 2.28 µg/g fresh weight and only in the concentration of Zn that he recorded a value of 27.50 µg/g, close to the value obtained in Badagry and Nun Rivers, and higher than the values obtained from both Sombreiro and Cross Rivers.…”

Section: Discussionsupporting

confidence: 49%

Safety of fish from Nigerian coastal waters

Unyimadu¹,

Nubi²,

Udochu³

et al. 2010

Science World Journal

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The safety of seafood (fish) from Nigerian coastal waters was studied using heavy metals as index of pollution using finfish samples from four locations (Badagry, Nun River, Sambreiro River, and Cross River). Pb, Cr, and Cd were found to be moderately elevated in 50%, 37.1%, and 35% of the samples respectively. In contrast, Mn, Zn, Cu, and Fe exhibited no discernable elevation. The distribution of heavy metals in finfish and safety status of the fish samples are discussed.

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Section: Discussionsupporting

confidence: 49%

Safety of fish from Nigerian coastal waters

Unyimadu¹,

Nubi²,

Udochu³

et al. 2010

Science World Journal

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“…The slightly acidic nature of all the sampling points in the reservoir may be due to the humic acid formed from decaying organic matter. The level of homogeneity observed in pH of the sediment is similar to the observations with reported works for bottom sediment of other water bodies in Nigeria [24,25,13]. [26,27] reported that lower pH value is typical of the anaerobic sediments.…”

Section: Discussionsupporting

confidence: 90%

Assessment of Heavy Metals Associated with Bottom Sediment of Asejire Reservoir, Southwest Nigeria

Godwin

2016

ILNS

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ABSTRACT.A study on the characteristic of sediment quality of Asejire Reservoir was conducted to evaluate the heavy metal content of the reservoir. Twenty stations were selected, samples and analyzed using standard methods. The result showed that the sediment was slightly acidic across the study stations, with low conductivity and organic matter content. The heavy metals order of dominance was: Fe>Pb>Cu>Zn>Mn>Al>Ba>Ni>Cr. The mean concentration levels of all the heavy metals were lower than mean background value except Fe, Cu and Pb. However, calculated Enrichment Factor (EF) values for all the heavy metals investigated showed that they were less than 1.5 (<1.5), suggesting that the heavy metals were all derived mainly from natural sources such as bedrock materials and weathering processes.

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“…This implies the organisms have the ability to bioaccumulate heavy metals in their tissues in the process of deposit-feeding and so integrate the environmental conditions of the water and sediment over time. Studies have also been conducted to show the concentration of heavy metals in this mollusc and other commercial fish species of economic value to determine hazardous level of contaminants in them with regards to human consumption [11,12,2,[13][14][15]. Azubie creek receives waste input more compared to adjacent Okujagu creek.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Heavy Metals and Bioaccumulation in Periwinkle (Tympanotonus fuscatus var. radula (L.))Obtained from the Upper Reaches of the Bonny Estuary, Nigeria

Moslen¹,

Ekweozor²,

Nwoka³

2017

J Heavy Met Toxicity Dis

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The aim of this study was to assess accumulation of heavy metals in tissues of Periwinkle (Tympanotonus fuscatus var radula (L.) obtained from Azuabie creek using Okujagu creek as control location. Fifty samples were collected from each site for three months (October-December 2015). Atomic Absorption Spectrophotometric technique was used in heavy metal analysis. Mean metal concentrations in sediments were as follows Zn: 178.08 mgkg -1 ; Cd: 0.3 mgkg -1 ; Cr: 14.27 mgkg -1 and Pb: 18.75 mgkg -1 . While those in Periwinkle tissue with biosediment accumulation factor (BAF) in parenthesis were thus Zn: 24.42 mgkg -1 (0.137); Cd: 0.02 mgkg -1 (0.067); Cr: 1.57 mgkg -1 (0.11) and Pb 0.01 mgkg -1 0.001). The result of BAF of metals indicated low values which could be related to assimilation and excretion rate of heavy metals in the organisms examined. Variations in the concentration of Zn in the gastropod tissues showed significant difference (p<0.01) between sites, likewise, Cr (p<0.001) and Cd (p<0.05). In conclusion, comparison between the two creeks showed that tissue samples from St1, St2 and St3 (Azuabie creek) had higher concentration of metals in relation to the control station (Okujagu creek) indicating potentials for accumulation, mainly due to differences in anthropogenic activities. Cr, Cd and Pb concentrations in tissue had mean values less than the recommended limits in seafood by FAO/WHO however, regular monitoring is required to observe perturbations.

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Heavy metals and organisms in the Lagos Lagoon

Cited by 59 publications

References 7 publications

Safety of fish from Nigerian coastal waters

Safety of fish from Nigerian coastal waters

Assessment of Heavy Metals Associated with Bottom Sediment of Asejire Reservoir, Southwest Nigeria

Assessment of Heavy Metals and Bioaccumulation in Periwinkle (Tympanotonus fuscatus var. radula (L.))Obtained from the Upper Reaches of the Bonny Estuary, Nigeria

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