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The concentration of heavy metals such as Lead (Pb), Zinc (Zn), Copper (Cu), Chromium (Cr) and Iron (Fe) were evaluated in forty-eight  plant samples from previously remediated oil spill sites located in Abia, Imo and Rivers states for two different seasons using Atomic  Absorption spectroscopy (AAS) in order to assess their availability in the plants. The results obtained were subjected to Analysis of variance (ANOVA) and multiple comparisons using IBM SPSS version 26.0. Results showed concentration of zinc, copper, chromium and copper were below the minimum limits of 6.0mg/kg by WHO, while cadmium and mercury levels were below detectable level of the AAS. However, lead concentrations in all the plant samples exceeded minimum acceptable limits of 0.1mg/kg as specified by WHO, as well as 0.2/0.3 for WHO/FOA joint standards.

Heavy metals, contamination, bioaccumulation, pollutants, bioavailability, remediation

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SMILE, G. D., HART, A. I., & OSUJI, L. C. (2021). EVALUATION OF HEAVY METALS IN PLANTS FROM PREVIOUSLY REMEDIATED SITES IN NIGER DELTA, NIGERIA. Journal of Global Ecology and Environment, 13(2), 12-26. Retrieved from https://www.ikprress.org/index.php/JOGEE/article/view/7070
Original Research Article


Imoobe TO, Iroro T. Ecological restoration of oil spill sites in the Niger Delta, Nigeria. Journal of Sustainable Development in Africa. 2009;11(2):54-65.

Ossai IC, Ahmed A, Hassan A, Hamid FS. Remediation of soil and water contaminated with petroleum hydrocarbon: A review. Environmental Technology Innovation. 2020; 17:100526.

Onyena AP, Sam K. A review of the threat of oil exploitation to mangrove ecosystem: Insights from Niger Delta, Nigeria. Global Ecology Conservation. 2020;22:e00961.

Fentiman A, Zabbey N. Environmental degradation and cultural erosion in Ogoniland: A case study of the oil spills in Bodo. The Extractive Industries Society. 2015;2(4):615-624.

Feka ZN, Morrison I. Managing mangroves for coastal ecosystems change: a decade and beyond of conservation experiences and lessons for and from west-central Africa. Journal of Ecology the Natural Environment. 2017; 9(6):99-123.

Grigg J. Environmental toxins; their impact on children’s health. Archives of Disease in Childhood. 2004;89(3):244-250.

Elum ZA, Mopipi K, Henri-Ukoh. Oil exploitation and its socioeconomic effects on the Niger Delta region of Nigeria. Environmental Science Pollution Research. 2016;23(13):12880-12889.

Inam E, Offiong NA, Essien J, Kang S, Kang SY, Antia BJEM, Assessment. Polycyclic aromatic hydrocarbons loads and potential risks in freshwater ecosystem of the Ikpa River Basin, Niger Delta—Nigeria. 2016;188(1):49.

Zabbey N, Uyi H. Community responses of intertidal soft-bottom macrozoobenthos to oil pollution in a tropical mangrove ecosystem, Niger Delta, Nigeria. Marine Pollution Bulletin. 2014;82(1-2):167-174.

Hart A, Oboh C, Barimalaa I, Sokari T. Concentrations of trace metals (lead, iron, copper and zinc) in crops harvested in some oil prospecting locations in Rivers State, Nigeria. African Journal of Food, Agriculture, Nutrition Development. 2005;5(2).

Damai AS. The United Nations Environment Programme (UNEP) Environmental assessment in assisting Nigerian government on solving Ogoniland oil contamination (2009-2011). President University; 2017.

Sam K, Coulon F, Prpich GJSOTTE. Working towards an integrated land contamination management framework for Nigeria. 2016; 571:916-925.

Wickboldt WC. Post Remedial Action Report, Lansdowne Radioactive Residence Complex, Dismantlement/Removal Project; 1990.

Singh A, Sharma RK, Agrawal M, Marshall FMJTE. Risk assessment of heavy metal toxicity through contaminated vegetables from waste water irrigated area of Varanasi, India. 2010;51(2):375-387.

Abere SA, Ideriah TJK, Emerhi EA. Lead and total hydrocarbon levels in Vernonia amygdalina and Telfairia ocidentalis along roadside farms in Port Harcourt, Nigeria. International Research Journal of Agricultural Science and Soil Science. 2011;1(7).

Okoye CO, Okwute GA. Heavy metal concentrations in food crops grown in crude oil impacted soils in Olomoro, delta state-Nigeria and their health implications. International Journal of English Scince Inventions. 2014; 3(3):15-21.

Steiner RJM, Amsterdam. Double standard: Shell practices in Nigeria compared with international standards to prevent and control pipeline oil spills and the Deepwater Horizon Oil Spill. 2010;11-15.

Okonkwo UU. The Aro, Host Communities and Continuities in Intergroup Suspicion in the Oguta Area since Pre-colonial times. Afro Asian Journal; 2011.

Tasrina R, Rowshon A, Mustafizur A, Rafiqul I, Ali MJJEAC. Heavy metals contamination in vegetables and its growing soil. 2015;2(142):2.

Rosas REK. Efficiency of White-Rot Fungi on the Biodegradation of Hydrocarbon Contaminated Soil. Universidad del Turabo (Puerto Rico); 2014.

Diarra I, Kotra KK, Prasad S. Assessment of biodegradable chelating agents in the phytoextraction of heavy metals from multi–metal contaminated soil. Chemosphere. 2021; 273:128483.

Jitar O, Teodosiu C, Oros A, Plavan G, Nicoara M. Bioaccumulation of heavy metals in marine organisms from the Romanian sector of the Black Sea. New Biotechnology. 2015;32(3): 369-378.

Kim JY, Lee JH, Kunhikrishnan A, Kang DW, Kim MJ, Yoo JH, Kim WI. Transfer factor of heavy metals from agricultural soil to agricultural products. Korean Journal of Environmental Agriculture. 2012;31(4):300-307.

Cui YJ, Zhu YG, Zhai RH, Chen DY, Huang YZ, Qiu Y, Liang JZ. Transfer of metals from soil to vegetables in an area near a smelter in Nanning, China. Journal of Environment International. 2004;30(6):785-791.

Gupta S, Jena V, Jena S, Davić N, Matić N, Radojević D, Solanki J. Assessment of heavy metal contents of green leafy vegetables. Croatian Journal of Food Science Technology. 2013;5(2):53-60.

Kacholi DS, Sahu M. Levels and health risk assessment of heavy metals in soil, water, and vegetables of Dar es Salaam, Tanzania. Journal of Chemistry; 2018.

Hakanson L. An ecological risk index for aquatic pollution control. A sedimentological approach. Water Research. 1980;14(8):975-1001.