Geochemical and mineralogical assessment of sediments in canal and lagoon parts of Lagos, southwestern Nigeria.
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Date
2017-04-30
Journal Title
Journal ISSN
Volume Title
Publisher
USEP: Journal of Research in Information Civil Engineering
Abstract
Indiscriminate dumping of refuse and discharge of untreated industrial waste
into the drainage systems and vehicular emissions has affected the quality of
most sediments deposition for its geological and civil engineering purposes.
This work is based on the assessment of sediments in canal and lagoon parts
of Lagos, Nigeria, for its geochemical and mineralogical formation. The clay
fraction ( < 63µm) in the sediments were processed and analyzed for their
heavy metal contents using Atomic Absorption Spectrophotometry (AAS)
and Inductive Coupled Plasma-Mass Spectrometry (ICP-MS) respectively.
The sediments were also studied for their mineralogical compositions by X
ray diffraction.
The clay mineralogy is predominantly consisting of
Kaolinite, Geothite and Quartz. The results of heavy metals in sediments
showed that canal sediments consist of Pb, Zn, Cu, As, Co, Cr, Cd, Hg, Fe
and Ni while lagoon sediments are Pb, Zn, Cu, As, Co, Cr, Cd, Hg, Fe, and
Ni. Based on the Geoaccumulation indices, the sediments are unpolluted with
respect to Zn, Cu, Ni, Co, Cr, and Fe. However, the canal and lagoon
sediments are variably polluted with respect to Pb, As, Cd, and Hg. The
canal and lagoon sediments are unpolluted to moderately polluted with
respect to Pb and As. In the case of Cd, the sediments are highly polluted. As
far as Hg is concerned both sediments of the canal and lagoon are very highly
polluted. With the exception of copper having (KD) value of less than 1.
Possible contamination sources are from industrial and anthropogenic
sources. These need to be monitored and controlled effectively.
Description
Keywords
Heavy metals, mineralogical, clay fraction, canal and lagoon.
Citation
2. Yusuf, M. A., Bale, R. B., Ibrahim, K. O., & Bakare, U. T. (2017). Geochemical and mineralogical assessment of sediments in canal and lagoon parts of Lagos, southwestern Nigeria. USEP: Journal of Research in Information Civil Engineering, 14 (2), 1478-1488,