Metal contamination assessment in the urban stream sediments and tributaries of coastal area southwest Nigeria.
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Date
2015
Authors
Odukoya, A.M
Akande, O
Journal Title
Journal ISSN
Volume Title
Publisher
Chinese Journal of Geochemistry
Abstract
A geochemical assessment of the fifty surface
stream sediments from Ikorodu Southwest Nigeria was
carried out to determine the level of contamination. The
sediments were dried, disaggregated and sieved to\75 lm
fraction for geochemical analysis, using the aqua-regia digestion
technique and inductively coupled plasma mass
spectrometry. Major elements showed the following trend
Fe [Al [Ca [Na [Mg [K[P[Ti and were below
the average shale concentration, except for Na in one sample.
Results from factor and correlation analyses showed two
groups of trace elements Ni, Co, Mn, U, Th, Sr, V, La, Cr, Ba,
Sc, Ga, Cs, Nb, Rb, Y,Ce and Mo, Pb, Zn, As, Cd, Sb, Sn, Zr,
which were from geogenic and anthropogenic sources, respectively.
The enrichment factor showed that Cd, Bi, Pt, Mo
and Ag were, for all samples, within background concentrations,
except those of the Ogun River and the Owode
Onirin, which showed significant enrichment of Cd, Zn, Cu,
Pb and Ag, depletion to minimal enrichment for Bi, Mo and
moderate enrichment for Pt. The contamination degree
ranged between 1.25 and 143.79. The highest value was
found at Owode Onirin and the lowest, at Igbonla 7. The geoaccumulation
index showed that all the stream sediments
ranged between practically uncontaminated to moderately to
highly contaminated—with Pb, Sn, Zn, Cd, Cu, Cr, Zr and
Ba. The potential ecological risk factor and environmental
risk index (IER) showed that all of the samples were within
the class of low to medium contamination risk, except
samples from the Owode Onirin, which fell within the class
of very high risk to extremely high risk respectively.
Description
Keywords
Indices , Ecological risk , Geogenic , Anthropogenic , Environment
Citation
Odukoya, A. M., & Akande, O. (2015). Metal contamination assessment in the urban stream sediments and tributaries of coastal area southwest Nigeria. Chinese Journal of Geochemistry, 34(3), 431-446.