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Geochemical fractionation and ecological risks assessment of benthic sediment-bound heavy metals from coastal ecosystems off the Equatorial Atlantic Ocean

Benson, N. U. and Udosen, E. D. and Essien, Joseph P. and Anake, W. U. and Adedapo , E.A. and Akintokun, Oyeronke A. and Fred-Ahmadu, O.H. and Olajire, A. A. (2017) Geochemical fractionation and ecological risks assessment of benthic sediment-bound heavy metals from coastal ecosystems off the Equatorial Atlantic Ocean. International Journal of Sediment Research. pp. 410-420.

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Abstract

This studydeterminesthepollution,fractionation,andecologicalrisksofsediment-boundheavymetals from coastalecosystemsofftheEquatorialAtlanticOcean.ContaminationFactor(CF),pollutionload index(PLI),andgeoaccumulationindex(Igeo) wereusedtoassesstheextentoftheheavymetalpol- lution, whilethepotentialecologicalriskwasevaluatedusingtherisksassessmentcode(RAC)and Håkanson potentialecologicalrisk.Theanalysisrevealedconcentrations(mg/g,dw)ofthecadmium(Cd), chromium (Cr),copper(Cu),nickel(Ni),andlead(Pb)insedimentsforwetanddryseasonsvaryfrom 4.40–5.08, 14.80–21.09,35.03–44.8,2.14–2.28, and172.24–196.39,respectively.Theresultsalsoshowed that themetalfractionationpercentagesintheresidual,oxidizable,andreduciblefractionsarethemost significant, whiletheexchangeableandcarbonateboundtracemetalsarerelativelylow.TheRACvalues indicate noriskforCdandNiandlowriskforothermetalsatallthestudiedsitesduringbothseasons. PotentialecologicalriskanalysisoftheheavymetalconcentrationsindicatesthatCdhadhighindividual potentialecologicalrisk,whiletheothermetalshavelowriskatallinvestigatedsites.Themulti-ele- mental potentialecologicalriskindices(R1) indicatehighecologicalriskinalltheecosystems

Item Type: Article
Uncontrolled Keywords: Speciation Heavy metal pollution Ecological risk assessment Contamination indicators Spatial distribution
Subjects: Q Science > QD Chemistry
Q Science > QE Geology
Q Science > QR Microbiology
Divisions: Faculty of Engineering, Science and Mathematics > School of Chemistry
Depositing User: Mrs Patricia Nwokealisi
Date Deposited: 12 Mar 2018 15:08
Last Modified: 12 Mar 2018 15:08
URI: http://eprints.covenantuniversity.edu.ng/id/eprint/10370

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