PMID- 12630475
OWN - NLM
STAT- MEDLINE
DCOM- 20030604
LR  - 20190714
IS  - 0013-936X (Print)
IS  - 0013-936X (Linking)
VI  - 37
IP  - 3
DP  - 2003 Feb 1
TI  - Relationship between particle mass and mobility for diesel exhaust particles.
PG  - 577-83
AB  - We used the aerosol particle mass analyzer (APM) to measure the mass of 
      mobility-classified diesel exhaust particles. This information enabled us to 
      determine the effective density and fractal dimension of diesel particles as a 
      function of engine load. We found that the effective density decreases as 
      particle size increases. TEM images showed that this occurs because particles 
      become more highly agglomerated as size increases. Effective density and fractal 
      dimension increased somewhat as engine load decreased. TEM images suggest that 
      this occurs because these particles contain more condensed fuel and/or 
      lubricating oil. Also, we observed higher effective densities when high-sulfur 
      EPA fuel (approximately 360 ppm S) was used than for Fischer-Tropsch fuel 
      (approximately 0 ppm S). In addition, the effective density provides the 
      relationship between mobility and aerodynamic equivalent diameters. The 
      relationship between these diameters enables us to intercompare, in terms of a 
      common measure of size, mass distributions measured with the scanning mobility 
      particle sizer (SMPS) and a MOUDI impactor without making any assumptions about 
      particle shape or density. We show that mass distributions of diesel particles 
      measured with the SMPS-APM are in good agreement with distributions measured with 
      a MOUDI and a nano-MOUDI for particles larger than approximately 60 nm. However, 
      significantly more mass and greater variation were observed by the nano-MOUDI for 
      particles smaller than 40 nm than by the SMPS-APM.
FAU - Park, Kihong
AU  - Park K
AD  - Department of Mechanical Engineering, University of Minnesota, 111 Church Street 
      SE, Minneapolis, Minnesota 55455, USA.
FAU - Cao, Feng
AU  - Cao F
FAU - Kittelson, David B
AU  - Kittelson DB
FAU - McMurry, Peter H
AU  - McMurry PH
LA  - eng
PT  - Journal Article
PT  - Research Support, U.S. Gov't, Non-P.H.S.
PL  - United States
TA  - Environ Sci Technol
JT  - Environmental science & technology
JID - 0213155
RN  - 0 (Air Pollutants)
RN  - 0 (Vehicle Emissions)
SB  - IM
MH  - Air Movements
MH  - Air Pollutants/*analysis
MH  - Environmental Monitoring
MH  - Particle Size
MH  - Vehicle Emissions/*analysis
EDAT- 2003/03/13 04:00
MHDA- 2003/06/05 05:00
CRDT- 2003/03/13 04:00
PHST- 2003/03/13 04:00 [pubmed]
PHST- 2003/06/05 05:00 [medline]
PHST- 2003/03/13 04:00 [entrez]
AID - 10.1021/es025960v [doi]
PST - ppublish
SO  - Environ Sci Technol. 2003 Feb 1;37(3):577-83. doi: 10.1021/es025960v.