Atmospheric coarse particulate concentrations and dry deposition fluxes for ten metals in two urban environments |
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| Institution: | 1. Physical Research Laboratory, Ahmedabad, 380009, India;2. Indian Institute of Tropical Meteorology, Pune, India;3. J.N.V. University, Jodhpur, India;1. Environment Research Institute, Shandong University, Ji''nan, Shandong, China;2. Department of Civil and Environmental Engineering, Hong Kong Polytechnic University, Hong Kong, China;3. Chinese Research Academy of Environmental Sciences, Beijing, China;4. Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing, Jiangsu, China;5. Department of Chemistry, University of California at Irvine, Irvine, CA, USA |
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| Abstract: | The atmospheric coarse particle concentrations of ten metals (Al, Ca, Cd, Cu, Fe, Mn, Ni, Pb, Si and Zn) were measured with the Noll Rotary Impactor (NRI) in the Los Angeles Basin (Claremont) California, and in Chicago, Illinois. The dry deposition fluxes were also measured for the ten elements at the Chicago site. An evaluation of the data demonstrates that the coarse particle mass could be divided into two categories: (1) material that was primarily of crustal origin (Al, Ca, Fe and Si) and (2) material that was primarily of anthropogenic origin (Cd, Cu, Mn, Ni, Pb and Zn). The mass of crustal material varied between 15 and 50% of the total coarse particle mass, while the mass of anthropogenic material was <1%. The dry deposition fluxes for the crustal material were between 20 (Al) and 200 (Si) ng m−2 s−1 while the fluxes for the anthropogenic material were between 1 and 7 ng m−1 s−1 for Cu, Mn, Pb and Zn. The cadmium (Cd) flux averaged 0.02 ng m−2 s−1. |
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