Benson, N. U. and Anake, W. U. and Essien, Joseph P. and Enyong, Paul and Olajire, A. A. (2016) Distribution and risk assessment of trace metals in Leptodius exarata, surface water and sediments from Douglas Creek, Qua Iboe estuary. Journal of Taibah University for Science. pp. 1-33. (In Press)
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Abstract
Five trace metals in Leptodius exarata, epipellic sediments and surface water from an intertidal ecosystem in Niger Delta (Nigeria) were investigated to evaluate their spatial distribution, degree of contamination, ecological and health risks. Results show Cd (cadmium), Cr (chromium), Ni (nickel), Pb (lead) and Zn (zinc) concentrations in sediment ranged between 0.550 – 1.142, 9.57 – 15.95, 9.15 – 13.96, 2.00 – 8.90 and 91.5 – 121.6 mg/kg dw, respectively; while L. exarata tissue metal content vary from 0.162 – 0.931, 3.81 – 8.62, 4.45 – 17.15, 1.90 – 7.35, and 125.55 – 269.75 mg/kg, dw, respectively. The bioconcentration factor ranking for trace metals followed the sequence Zn>Ni>Pb >Cr>Cd. High biota to sediment accumulation factor (BSAF) in L. exarata reveals a sentinel metal bioindicator. Sediments from most sites were uncontaminated to moderately contaminated (geoaccumulation, Igeo > 0) with Cd and Zn associated with anthropogenic intrusions. Low mean-ERM (effect range-median) and mean-PEL (probable effect level) quotients of sediments are observed, indicating low–medium degree of contamination with 30% and 21% probability of being toxic. The multi-metal potential ecological risk index (RI) for the intertidal ecosystem indicates low–moderate risk. Health risks associated with crabs (L. exarata) consumption are significant in children than adults.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Trace metals; surface water; bioindicator; sediment contamination; pollution indices; health risk assessment |
| Subjects: | Q Science > Q Science (General) Q Science > QD Chemistry |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Chemistry |
| Depositing User: | Mrs Hannah Akinwumi |
| Date Deposited: | 24 Jan 2017 12:21 |
| Last Modified: | 24 Jan 2017 12:21 |
| URI: | http://eprints.covenantuniversity.edu.ng/id/eprint/7653 |
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