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A tentative study of urban and suburban fine particles (PM2.5) collected in Ouagadougou, Burkina Faso

Journal article
Authors Johan Boman
Jenny Lindén
Sofia Thorsson
Björn Holmer
Ingegärd Eliasson
Published in X-Ray Spectrometry
Publication year 2009
Published at Department of Chemistry
Department of Earth Sciences
Department of Conservation
Language en
Links dx.doi.org/10.1002/xrs.1173
Subject categories Chemical Sciences

Abstract

The aim of the study was to determine the mass, black carbon (BC), and elemental concentrations in fine particles (PM2.5) and their variations at two sites in Ouagadougou, the capital city of Burkina Faso. The weather situation in Ouagadougou during the field campaign was dominated by high pressure with variable cloudiness and no precipitation. Diurnal temperatures varied between 19 and 38 °C and relative humidity between 10 and 60%. Winds in Ouagadougou were generally coming in from the north, showing a diurnal pattern with gusts of up to 6 m/s during daytime, while evenings and nights were calmer with very stable atmospheric conditions. However, during part of this field campaign, a period of nighttime moderately stable atmospheric conditions occurred with increased wind speed and more easterly winds. Cyclones were used for the PM2.5 particle collection at both sites. The elemental analysis was done using energy dispersive x-ray fluorescence (EDXRF) spectroscopy. Cl, K, Ca, Ti, Mn, Fe, Cu, Zn, Br, Rb, Sr, and Pb were identified and quantified in most of the samples. The particle mass concentration was 27-164 µg/m3 while BC varied between 1.3 and 8.2 µg/m3. No influence of leaded gasoline was found. Soil dust was identified as a major component of the particles, which was confirmed by comparing with the elements in a soil sample. A significant difference in elemental, BC, and mass concentrations was seen between periods with very stable and moderately stable atmospheric conditions. Copyright © 2009 John Wiley & Sons, Ltd.

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