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Effective Density and Mixing State of Aerosol Particles in a Near-Traffic Urban Environment

Environmental science & technology, 2014-06, Vol.48 (11), p.6300-6308 [Peer Reviewed Journal]

Copyright © 2014 American Chemical Society ;ISSN: 0013-936X ;ISSN: 1520-5851 ;EISSN: 1520-5851 ;DOI: 10.1021/es5000353 ;PMID: 24798545

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Title:
Effective Density and Mixing State of Aerosol Particles in a Near-Traffic Urban Environment
Author: Rissler, Jenny ; Nordin, Erik Z ; Eriksson, Axel C ; Nilsson, Patrik T ; Frosch, Mia ; Sporre, Moa K ; Wierzbicka, Aneta ; Svenningsson, Birgitta ; Löndahl, Jakob ; Messing, Maria E ; Sjogren, Staffan ; Hemmingsen, Jette G ; Loft, Steffen ; Pagels, Joakim H ; Swietlicki, Erik
Subjects: Aerosols - analysis ; Aerosols - chemistry ; Cities ; Condensed Matter Physics ; Den kondenserade materiens fysik ; Denmark ; Engineering and Technology ; Environmental Monitoring - methods ; Fysik ; Maskinteknik ; Mechanical Engineering ; Natural Sciences ; Naturvetenskap ; Particle Size ; Particulate Matter - analysis ; Particulate Matter - chemistry ; Physical Sciences ; Production Engineering, Human Work Science and Ergonomics ; Produktionsteknik, arbetsvetenskap och ergonomi ; Subatomic Physics ; Subatomär fysik ; Teknik ; Time Factors ; Vehicle Emissions - analysis
Is Part Of: Environmental science & technology, 2014-06, Vol.48 (11), p.6300-6308
Description: In urban environments, airborne particles are continuously emitted, followed by atmospheric aging. Also, particles emitted elsewhere, transported by winds, contribute to the urban aerosol. We studied the effective density (mass-mobility relationship) and mixing state with respect to the density of particles in central Copenhagen, in wintertime. The results are related to particle origin, morphology, and aging. Using a differential mobility analyzer-aerosol particle mass analyzer (DMA-APM), we determined that particles in the diameter range of 50–400 nm were of two groups: porous soot aggregates and more dense particles. Both groups were present at each size in varying proportions. Two types of temporal variability in the relative number fraction of the two groups were found: soot correlated with intense traffic in a diel pattern and dense particles increased during episodes with long-range transport from polluted continental areas. The effective density of each group was relatively stable over time, especially of the soot aggregates, which had effective densities similar to those observed in laboratory studies of fresh diesel exhaust emissions. When heated to 300 °C, the soot aggregate volatile mass fraction was ∼10%. For the dense particles, the volatile mass fraction varied from ∼80% to nearly 100%.
Publisher: United States: American Chemical Society
Language: English
Identifier: ISSN: 0013-936X
ISSN: 1520-5851
EISSN: 1520-5851
DOI: 10.1021/es5000353
PMID: 24798545
Source: SWEPUB Freely available online

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Effective Density and Mixing State of Aerosol Particles in a Near-Traffic Urban Environment

Copyright © 2014 American Chemical Society ;ISSN: 0013-936X ;ISSN: 1520-5851 ;EISSN: 1520-5851 ;DOI: 10.1021/es5000353 ;PMID: 24798545

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