Abstract
Harmattan dust and traffic-related pollution have been a serious environmental concern in the West African sub-region. In order to further contribute to the understanding of ambient levels of atmospheric pollution and chemical composition in the region, this study monitored harmattan dust and traffic-related particulate matter at four locations across southwestern (Ile-Ife) and north-western (Zaria) geo-political zones of Nigeria. The collected samples were characterized for their chemical composition using Energy-Dispersive X-Ray Fluorescence spectrometer equipped with an optimized secondary target x-ray excitation conditions (Al, CaF2, Fe, Ge, Zr, Mo, Ag, Al2O3). The objectives are to assess spatio-temporal mass concentrations, chemical footprints, enrichment factors, elemental correlations, and ratios at all locations. The X-ray analytical method was validated with a NIST SRM 2783 air particulate standard, and detection limits for each chemical specie were determined. Validation results showed good reproducibility of the certified reference material with relative standard deviations of the elements much lower by about 1–13% than the corresponding reference values. Mass concentrations reached up to 2200 μgm−3 in the north and 1500 μgm−3 in the south. The range of mean concentration of crustal marker elements were Al (5–27 μgm−3), Si (5–856 μgm−3), Ca (0.78–13 μgm−3), and Fe (2–13 μgm−3), and were most abundant during the harmattan particularly in the southwestern region. Highest mean concentration values of 380, 810, and 420 ngm−3 were recorded for Cr, Cu, and Pb respectively at the traffic corridor which also recorded the highest enrichment factors. Black carbon and elemental concentrations contributed between 1 to 54% and 9 to 94% across the locations respectively. Backward trajectories of atmospheric flow over the locations showed two dominant sources; dust laden source from the Sahara desert and maritime flow over the Gulf of Guinea. This study found that chemical footprints (Al, Si, K, Ca, Ti, and Fe) of harmattan-related dust were more correlated (r2 between 0.88 and 0.99) than those attributed to dust re-suspension at the traffic location.
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Acknowledgments
O. E. Abiye and C. E. Ugwumadu are grateful for International Atomic Energy Agency (IAEA) Training Fellowship at the Agency’s Nuclear Science and Instrumentation Laboratory (NSIL) in Seibersdorf, Austria. We specially thank Prof. Piet Van Espen of Antwerp University Belgium, Drs. Roman Padilla Avarez and Allessandro Migrioli for their mentorship. O. E. Abiye is grateful for the travel support received from Centre for Atmospheric Research (CAR) Kogi State University Campus, National Space Research and Development Agency, Nigeria to present this work at The Sao Paulo School of Advance Science on Atmospheric Aerosols, Brazil in 2019. The authors gratefully acknowledge the NOAA Air Resources Laboratory (ARL) for the provision of the HYSPLIT transport and dispersion model and READY website (http://www.ready.noaa.gov) used in this publication. The modified 8-port sampler and consumables used in this study were generously donated by Dr. Monica Price of Faculty of Health Sciences & Wellbeing, University of Sunderland, UK and is hereby appreciated.
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Abiye, O.E., Matthew, O.J., Rabiu, A.B. et al. Chemical footprints of harmattan dust and traffic corridor particulates monitored at two environmentally distinct geopolitical zones in Nigeria. Environ Sci Pollut Res 27, 39317–39329 (2020). https://doi.org/10.1007/s11356-020-10004-x
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DOI: https://doi.org/10.1007/s11356-020-10004-x