Trace metal concentrations and water solubility in size-fractionated atmospheric particles and influence of road traffic

Birmili, Wolfram, Allen, Andrew G., Bary, Frederick and Harrison, Roy M. (2006) Trace metal concentrations and water solubility in size-fractionated atmospheric particles and influence of road traffic. Environmental Science & Technology (including News & Research Notes), 40(4), pp. 1144-1153. ISSN (print) 0013-936X

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The abundance and the behavior of metals (Al, Ti, Mn, Fe, Co, Ni, Cu, Zn, Se, Ag, Cd, Sn, Ba, Pt, Hg, and Pb) and ions (Na+ K+ Mg2+ Ca2+, NH4+, Cl-, NO3-, SO4(2-), PO4(3-), and oxalate) in size-fractionated atmospheric particulate matter (PM) were studied in the U. K. and Ireland at four observation sites simulating extreme degrees of vehicular-traffic influence in the environment. Trace metals in urban PM showed distinct types of size-fractionated behavior depending on the particle sources from which they originate. In coarse PM (1.5 < Dp < 3.0 microm) the concentrations of copper, barium, and iron correlated closely across over 2 orders of magnitude in urban air, which is seen as evidence that major portions of transition metals (Cu, Ba, Fe, and Mn) are released through abrasive vehicular emissions, particularly the wear of brake linings. Further results are strongly indicative of a decoupling of coarse iron and calcium, the former arising predominantly from vehicles, the latter from soil resuspension. In fine PM (Dp < 0.5 microm), several combustion and secondary sources of particulates were identified, but these were much less unique in terms of elemental fingerprints. An analysis of the water solubility of trace metals yielded that solubility varies considerably with element and, to a lesser extent, with particle size. Notable differences were found to the elemental water solubilities determined in previous work, partially explained by differences in extraction procedures.

Item Type: Article
Additional Information: This work was supported by the U. K. Natural Environment Research Council [Application No. ICP/200/0302] and the EU [Marie Curie Grant No. EVK4-CT-2000-50002].
Uncontrolled Keywords: airborne particulate matter, physicochemical characterization, urban, aerosol, pm2.5, distributions, sites, pm10, fine, exposure
Research Area: Chemistry
Faculty, School or Research Centre: Faculty of Science (until 2011)
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Depositing User: Automatic Import Agent
Date Deposited: 24 Jan 2013 11:08
Last Modified: 14 Oct 2014 12:55

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