title: Contamination indices and heavy metal concentrations in urban soil of Ibadan metropolis, southwestern Nigeria.
abstract: An assessment was conducted on soils of Ibadan metropolis using geochemical approach in order to establish the concentration of heavy metals and develop geoaccumulation index maps. Petrographic studies and X-ray diffractograms showed that soils of Ibadan were derived from the weathering of the bedrocks. The concentrations of Cu, Pb, and Zn were found to be greater in soils more than the background. Positive correlation occurred between Cu, Pb, and Zn indicated a common anthropogenic source in the soil while Mn, Cr, and Ni were found to be naturally enriched. The geoaccumulation index maps revealed significant enrichment factor (Ef 20) and index of geoaccumulation (Igeo) beyond class four (heavily contaminated) for Cu, Pb, and Zn in densely populated and industrial areas, whereas Cd is enriched in sparsely populated areas, agricultural areas and a few spots in densely populated areas.
authors: Department of Earth Sciences, Olabisi Onabanjo University, Ago Iwoye, Nigeria. odewandeadesoji@hotmail.com
authors: Adewara Adesoji
authors: AA
authors: Odewande
authors: Akinlolu F
authors: AF
authors: Abimbola
mesh_terms: D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000032:analysis; D006801:Humans; D019216:Metals, Heavy / Q000032:analysis*; D009549:Nigeria; D012989:Soil Pollutants / Q000032:analysis*; D014505:Urban Population
chemical_list: D019216:Metals, Heavy; D012989:Soil Pollutants
references: Bull Environ Contam Toxicol. 1997 Dec;59(6):861-7
references: 9400654
references: Environ Pollut. 2004 May;129(1):113-24
references: 14749075
references: Environ Pollut. 1987;47(4):293-304
references: 15092703
references: Arch Environ Health. 1992 Sep-Oct;47(5):336-46
references: 1444595
references: Environ Res. 1994 Apr;65(1):42-55
references: 8162884
references: Environ Res. 1982 Jun;28(1):39-54
references: 7106075
references: Environ Pollut. 1988;50(1-2):139-61
references: 15092656
references: Arch Environ Contam Toxicol. 2000 May;38(4):428-38
references: 10787093
references: Environ Res. 1999 Apr;80(3):215-21
references: 10092442
references: Epidemiology. 1995 Mar;6(2):101-3
references: 7742391