Geochemical and Geotechnical Characteristics of Soil within Oke-diya Dumpsite in Sagamu South Western Nigeria.
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Date
2015
Authors
Odukoya, A.M
Sama, A
Journal Title
Journal ISSN
Volume Title
Publisher
Physical Science International Journal
Abstract
This research was to determine geotechnical and geochemical characteristics of soil around Oke
diya dumpsite in Sagamu Southwestern Nigeria. Five soil samples were collected within dumpsite
at depth of 0-20 cm to determine their engineering properties in accordance with the British
Standards. Another eight (8) soil samples were collected vertically at the depth of 1m interval for
geochemical analysis using Inductively Coupled Plasma-Mass Spectrophotometer method (ICP
MS).
The specific gravity value ranges between 2.78–3.00 which fall within moderate degree of
laterization and dehydration. The soil generally can be classified as silty sand of intermediate to
high plasticity or compressibility based on the percentage grain size distribution and Casagrande
Plasticity Chart. Permeability tests showed low permeability within the range of 1.8 x 10-6 cm/s –
2.12 x 10-6 cm/s. Therefore the soil has capacity to provide long term protection of groundwater by
natural attenuation as a result of the thickness of the unsaturated zone, high silt content and low
permeability.
Thirty one elements were determined in the soil samples. The relative abundance of the major and
significant trace elements followed the order Al > Fe > K > Mg > Ca > Ti > Na > S > P and V > Mn
> Cr > Ba > Sr > Cu > Zn > Pb > Zr > Ni > Sc > Y > Co > Mo respectively. There was a general
trend of decrease in metals concentration as the depth of sampling increases.
Result of geo-accumulation index showed that the soil samples were practically uncontaminated
with Mn, Ni, Zn, Ba, Cr, Sc, Co, Sr, Cu, Zr and Y, practically to moderately contaminated with Pb
and V and was moderately contaminated with Mo. Other contamination assessment showed that
the soil fall within low contamination factor with all the trace elements except with Pb which falls
within moderately contamination.
Description
Keywords
Trace elements , contamination , soil
Citation
Odukoya, A. M., & Sama, A. (2015). Geochemical and Geotechnical Characteristics of Soil within Oke-diya Dumpsite in Sagamu South Western Nigeria. Physical Science International Journal, 6(4), 225-235