Intercomparison of photoacoustic and thermal-optical methods for the measurement of atmospheric elemental carbon

Barbara J. Turpin, James Huntzicker, Karen M. Adams

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Two atmospheric elemental carbon measurement methods based on different analytical principles have been compared using data collected during the summer of 1987 at the Claremont, California site of the Southern California Air Quality Study (SCAQS). An optical absorption method, photoacoustic spectroscopy, measured the visible light absorption (γ = 514.5 nm) of atmospheric elemental carbon in its natural aerosol-state in real time. Elemental carbon concentrations were obtained by applying the appropriate value of the absorption cross-section for elemental carbon to the optical absorption data. The other method was a thermal-optical technique, which measures elemental and organic carbon concentrations on a filte--collected sample by combustion and corrects for the pyrolytic conversion of organic to elemental carbon by measuring the transmittance of laser light through the sample. Aerosol was collected on a filter mounted inside the carbon analyzer and analyzed in place. A 2-h collection and analysis cycle was used. The real-time photoacoustic data integrated over ∼100 min were compared with thermal-optical data. The two methods compare quite well. The linear least squares fit gave a correlation coefficient of R=0.905, and no significant difference was seen between the two data sets at the 95% confidence level.

Original languageEnglish (US)
Pages (from-to)1831-1835
Number of pages5
JournalAtmospheric Environment Part A, General Topics
Volume24
Issue number7
DOIs
StatePublished - 1990

Fingerprint

optical method
Photoacoustic effect
Carbon
carbon
Light absorption
Aerosols
aerosol
Photoacoustic spectroscopy
transmittance
measurement method
Organic carbon
Air quality
Hot Temperature
air quality
cross section
combustion
laser
organic carbon
spectroscopy
filter

Keywords

  • aerosol instrumentation
  • carbonaceous aerosol
  • Elemental carbon
  • photoacoustic
  • SCAQS
  • thermal-optical

ASJC Scopus subject areas

  • Pollution
  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

Intercomparison of photoacoustic and thermal-optical methods for the measurement of atmospheric elemental carbon. / Turpin, Barbara J.; Huntzicker, James; Adams, Karen M.

In: Atmospheric Environment Part A, General Topics, Vol. 24, No. 7, 1990, p. 1831-1835.

Research output: Contribution to journalArticle

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