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Evaluating the quality of sediments in streams draining contrasting land-use areas in Osogbo metropolis, southwestern Nigeria
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Journal Article
Evaluating the quality of sediments in streams draining contrasting land-use areas in Osogbo metropolis, southwestern Nigeria
2024
Overview
The attendant effects of urbanization on the environment and human health are evaluable by measuring the potentially harmful element (PHE) concentrations in environmental media such as stream sediments. To evaluate the effect of urbanization in Osogbo Metropolis, the quality of stream sediments from a densely-populated area with commercial/industrial activities was contrasted with sediments from a sparsely-populated area with minimal anthropogenic input.
Forty samples were obtained: 29 from Okoko stream draining a Residential/Commercial Area (RCA,
n
= 14) and an Industrial Area (IA,
n
= 15), and 11 from Omu stream draining a sparsely-populated area (SPA). The samples were air-dried, sieved to < 75 micron fraction, and analysed for PHEs using inductively-coupled plasma atomic emission spectrometry (ICP-AES). Index of geoaccumulation (I
geo
), pollution index (PI), ecological risk factor (Er) and index (ERI) were used for assessment. Inter-elemental relationships and source identification were done using Pearson’s correlation matrix and principal component analysis (PCA).
PHE concentrations in the stream sediments were RCA: Zn > Pb > Cu > Cr > Sr > Ni > Co, IA: Zn > Cr > Ni > Co > Pb > Cu > Sr and SPA: Zn > Co > Cr > Cu > Sr > Ni > Pb. I
geo
calculations revealed moderate-heavy contamination of Cu, Pb and Zn in parts of RCA, moderate-heavy contamination of Zn in IA while SPA had moderate contamination of Co and Zn. PI values revealed that stream sediments of RCA are extremely polluted, while those of IA and SPA are moderately and slightly polluted, respectively.
The pollution of the stream sediments in RCA and IA is adduced to anthropogenic activities like vehicular traffic, automobile repairs/painting, blacksmithing/welding and metal scraping. In SPA however, the contamination resulted from the application of herbicides/fertilizers for agricultural purposes.
Publisher
Springer Netherlands,Springer Nature B.V
Subject
/ atomic absorption spectrometry
/ Chromium
/ Cities
/ Cobalt
/ Copper
/ Drainage
/ Earth and Environmental Science
/ Environmental Monitoring - methods
/ Geologic Sediments - analysis
/ Geologic Sediments - chemistry
/ Land use
/ Lead
/ Nickel
/ Nigeria
/ Principal Component Analysis
/ Principal components analysis
/ Rivers
/ Sediment
/ streams
/ traffic
/ Water Pollutants, Chemical - analysis
/ Welding
/ Zinc
