PMID- 16913132
OWN - NLM
STAT- MEDLINE
DCOM- 20070316
LR  - 20191210
IS  - 0013-936X (Print)
IS  - 0013-936X (Linking)
VI  - 40
IP  - 15
DP  - 2006 Aug 1
TI  - Evaluation of the Dekati mass monitor for the measurement of exhaust particle 
      mass emissions.
PG  - 4739-45
AB  - The Dekati mass monitor (OMM) is an instrument which measures the mass 
      concentration of airborne particles in real time by combining aerodynamic and 
      mobility size particle classification. In this study, we evaluate the performance 
      of the DMM by sampling exhaust from five engines and vehicles of different 
      technologies in both steady-state and transient tests. DMM results are found 
      higher than the filter-based particulate matter (PM) by 39 +/- 24% (range stands 
      for +/- one standard deviation) for 62 diesel tests conducted in total and 3% and 
      14% higher, respectively, in two gasoline tests. To explore whether the 
      difference occurs because of the different measurement principles of DMM and 
      filter-based PM, the DMM operation is replicated over steady-state tests by 
      combining an electrical low-pressure impactor (ELPI) and a scanning mobility 
      particle sizer (SMPS). The correlation of ELPI and SMPS derived mass and 
      filter-based PM is satisfactory (R2 = 0.95) with a mean deviation of 5 +/- 15%. 
      For the same tests, the correlation of DMM with PM was also high (R2 = 0.95), but 
      DMM exceeded PM by 44 +/- 23% on average. The comparison of ELPI and SMPS and DMM 
      results reveals that the latter overestimates both the geometric mean diameter 
      and especially the width of the particle mass-weighted size distribution. These 
      findings demonstrate thatthe statistically significant difference between the DMM 
      and the filter-based PM cannot just originate from the different measurement 
      principles but also from the actual implementation of the combined 
      aerodynamic-mobility measurement in the DMM. Optimizing the DMM will require 
      changes in its design and/or the calculation algorithm to improve the resolution 
      and width of the aerodynamic size distribution recorded.
FAU - Mamakos, Athanasios
AU  - Mamakos A
AD  - Laboratory of Applied Thermodynamics, Mechanical Engineering Department, 
      Aristotle University Thessaloniki, P.O. Box 458, GR-54124 Thessaloniki, Greece.
FAU - Ntziachristos, Leonidas
AU  - Ntziachristos L
FAU - Samaras, Zissis
AU  - Samaras Z
LA  - eng
PT  - Evaluation Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - Environ Sci Technol
JT  - Environmental science & technology
JID - 0213155
RN  - 0 (Particulate Matter)
RN  - 0 (Vehicle Emissions)
SB  - IM
MH  - Algorithms
MH  - Environmental Monitoring/*methods
MH  - *Particle Size
MH  - Particulate Matter/analysis
MH  - Vehicle Emissions/*analysis
EDAT- 2006/08/18 09:00
MHDA- 2007/03/17 09:00
CRDT- 2006/08/18 09:00
PHST- 2006/08/18 09:00 [pubmed]
PHST- 2007/03/17 09:00 [medline]
PHST- 2006/08/18 09:00 [entrez]
AID - 10.1021/es052302c [doi]
PST - ppublish
SO  - Environ Sci Technol. 2006 Aug 1;40(15):4739-45. doi: 10.1021/es052302c.