title: Evaluation of the impact of asbestos wastes on soils in Emene-Enugu, Southeastern Nigeria.
abstract: This study investigated the impacts of asbestos wastes on soils in Emene-Enugu, southeastern Nigeria, generated by the activities of a major asbestos products manufacturing company in southeastern Nigeria. The methods of investigation included vertical electrical sounding (VES), 2-D horizontal resistivity profiling (HRP), induced polarization (IP) survey, chemical analysis of plant tissues and standard penetration tests of soil samples. The 2-D HRP and IP identified six closed waste pits alongside the two active pits. The VES revealed four geoelectrical layers in the area: from bottom to top; the inferred lithologies included dark shale, clay, gravel and recent sands. The geochemical data results revealed that Cd concentration of the soils of the waste pits is above the contaminated land exposure assessment soil guideline value for residential and allotment land uses. The geochemical pollution indices classified the soils as "unpolluted" to "extremely polluted". Bioconcentration factor of Pb in plant tissues was found to be above recommended limits of 0.045. The geotechnical parameters indices revealed that the soils varied from "very soft" to "stiff" and "very loose" to "medium". Soils of the active pits have very low strength and bearing capacity while closed pits have high strength and bearing capacity. It may be safe, therefore, to conclude that as the wastes are completely turned into soils, they will assume geotechnical properties similar to those of natural soils.
authors.affiliation: Department of Geology, University of Nigeria, Nsukka, Nigeria.
authors.forename: O
authors.initials: O
authors.lastname: Igwe
authors.forename: O V
authors.initials: OV
authors.lastname: Omonona
authors.forename: O S
authors.initials: OS
authors.lastname: Onwuka
authors.forename: O D
authors.initials: OD
authors.lastname: Nnebedum
mesh_terms: D001194:Asbestos / Q000032:analysis*; D004784:Environmental Monitoring; D004787:Environmental Pollution / Q000032:analysis / Q000706:statistics & numerical data; D009549:Nigeria; D010944:Plants / Q000737:chemistry; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D012987:Soil; D012989:Soil Pollutants; D001194:Asbestos
references.citation: Sci Total Environ. 2007 Oct 15;385(1-3):182-95
references.pmid: 17692900
references.citation: Sci Total Environ. 2006 Sep 15;368(2-3):456-64
references.pmid: 16600337
references.citation: Environ Pollut. 2000 Jul;109(1):1-9
references.pmid: 15092907
references.citation: Sci Total Environ. 2000 Apr 17;249(1-3):257-80
references.pmid: 10813458
references.citation: Mar Pollut Bull. 2007 Jul;54(7):974-82
references.pmid: 17433373
references.citation: Environ Int. 2004 Jan;29(7):979-85
references.pmid: 14592575
references.citation: Environ Pollut. 2003;121(2):169-80
references.pmid: 12521105
references.citation: Environ Int. 2007 Apr;33(3):346-56
references.pmid: 17196656
references.citation: Environ Int. 2001 Apr;26(4):265-73
references.pmid: 11341295