ELEMENTAL CHARACTERIZATION AEROSOLS IN WET DEPOSITION ALONG A DENSE TRAFFIC HIGHWAY IN OGBOMOSO , NIGERIA
A.O. ALAMU, A.O. ALADE, S.A. ADEBANJO, L.A. JIMODA
ETRJ. Vol. 5(1), 31 March, 2020
826 Download(s) 443 View(s)
Abstract: Atmospheric samples of wet deposition were collected at seven sampling locations along a dense traffic highway
in Ogbomoso, Nigeria for one month. Wet deposition flux evaluated ranged from 0.4926-0.6015 μg/m2.d.
Particulate matters samples were analyzed for ten trace metals through Atomic Absorption Spectrophotometer
(AAS). Trace metals were extracted from filters with digestion method using a mixture of HNO3 and H2O2. The
average concentration of the trace metals: Cd, Cr, Mn, Pb, Zn, Cu, AS, Ca, Ni and Fe, in wet deposition were
45.42, 52.46, 15.29, 71.23, 458.9, 747.2, 22.92, 291.3, 63.32, 744.2 μg/m3 respectively. These concentrations were
higher than WHO and FEPA standard limits of trace metals in air. The mean concentrations of trace metals in
wet deposition were found in the order of Cu>Fe>Zn>Ca>Pb>Ni>Cr>Cd>As>Mn. Correlation studies showed
that the trace metals originated from common source along the highway: Cd was highly correlated with Cr
(r=0.7607), Cr was highly correlated with Zn (r = 0.912), Pb with Cu (r=0.9559), Ca (r=0.7632) and Ni
(r=0.9114). Enrichment factor analysis showed that Cd, Cr Zn, Cu, As Pb and Ni originated from anthropogenic
sources, majorly traffic and industrial activities while Fe and Ca were of crustal origin.
