PMID- 21347460
OWN - NLM
STAT- MEDLINE
DCOM- 20110722
LR  - 20110406
IS  - 1464-0333 (Electronic)
IS  - 1464-0325 (Linking)
VI  - 13
IP  - 4
DP  - 2011 Apr
TI  - Temperature effect of tapered element oscillating microbalance (TEOM) system 
      measuring semi-volatile organic particulate matter.
PG  - 1017-26
LID - 10.1039/c0em00451k [doi]
AB  - The tapered element oscillating microbalance (TEOM) system is widely used to 
      measure continuous particle mass concentrations in air quality networks. However, 
      the semi-volatile aerosol material is lost under normal operation conditions (50 
       degrees C). This study has evaluated the error in the organic fraction of the 
      TEOM-measured secondary organic aerosols formed from the degradation of biogenic 
      pollutants. Experiments were carried out under controlled, water-free conditions 
      in a fully equipped, high volume atmospheric simulator--the European PhotoReactor 
      (EUPHORE). The ozonolysis of alpha-pinene, beta-pinene and limonene provided a 
      reproducible source of organic aerosol. Particulate matter concentration profiles 
      were registered for different TEOM operating temperatures. When these values were 
      compared with values from a filter-based gravimetric method and a scanning 
      mobility particle sizer (SMPS), they showed that the differences between 
      monitoring systems increased with increasing TEOM temperature. According to our 
      results, when the TEOM is operated at 50  degrees C, it fails to measure 32-46% of the 
      organic particulate material, depending on the aerosol precursor. This study has 
      also identified and quantified the multi-oxygenated organic compounds lost in the 
      TEOM monitoring by using a method based on the gas chromatography-mass 
      spectrometry technique. Important losses have been calculated for relevant 
      ambient aerosol compounds such as pinonic acid, pinonaldehyde, norpinone and 
      limonalic acid. In conclusion, the present study has demonstrated that a high 
      operating temperature of the TEOM monitor reduces the humidity interference but 
      underestimates the semi-volatile organic fraction.
FAU - Tortajada-Genaro, Luis-Antonio
AU  - Tortajada-Genaro LA
AD  - Dpto. Quimica-IDM, Universidad Politecnica de Valencia, Camino de Vera, s/n, 
      46022 Valencia, Spain. luitorge@qim.upv.es
FAU - Borras, Esther
AU  - Borras E
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20110223
PL  - England
TA  - J Environ Monit
JT  - Journal of environmental monitoring : JEM
JID - 100968688
RN  - 0 (Aerosols)
RN  - 0 (Volatile Organic Compounds)
SB  - IM
MH  - Aerosols
MH  - Environmental Monitoring/methods
MH  - Reproducibility of Results
MH  - Temperature
MH  - Thermogravimetry
MH  - Volatile Organic Compounds/*analysis
EDAT- 2011/02/25 06:00
MHDA- 2011/07/23 06:00
CRDT- 2011/02/25 06:00
PHST- 2011/02/25 06:00 [entrez]
PHST- 2011/02/25 06:00 [pubmed]
PHST- 2011/07/23 06:00 [medline]
AID - 10.1039/c0em00451k [doi]
PST - ppublish
SO  - J Environ Monit. 2011 Apr;13(4):1017-26. doi: 10.1039/c0em00451k. Epub 2011 Feb 
      23.