Analytical Methods to Measure the Carbonaceous Content of Aerosols
Increased use of diesel fuel and coal over the next decade could lead to increased amounts of carbonaceous material in fine particle aerosols. For this reason, EPA has for the past few years been developing and evaluating a number of analytical methods to characterize ambient concentrations of carbonaceous aerosols. These include methods based either on combustion of carbonaceous material to CO2 (or CH4) with subsequent detection, or on nondestructive optical measurements. These methods are designed so that the carbon content of aerosols can be measured in samples collected by dichotomous samplers using a variety of filter media. The combustion method uses a Dohrmann Model DC-50 carbon analyzer with a detection limit of 0.5μg.Optical measurements are made with prototype light transmission and photoacoustic instruments. Comparisons of combustion and optical methods are presented for carbon in aerosols collected in Houston, TX and the Shenandoah Valley of VA.
KeywordsElemental Carbon Time Series Plot Lawrence Berkeley Laboratory Teflon Filter Carbon Measurement
Unable to display preview. Download preview PDF.
- 5.S. Will, “Air Quality In The Rural Ozark Region; Atmospheric Chemical Constituents That Cause Visual Impairment and Their Sources” M.S. Thesis University of Washington, Seattle, WA. 1980.Google Scholar
- 6.J. Moyers, Private Communication.Google Scholar
- 8.B. R. Appel, E. M. Hoffer, E. L. Kothny, S. M. Wall, M. Haik and R. L. Knights, “Diurnal Variations of Organic Aerosol Constituents in the Los Angeles Basin” Proceedings Carbonaceous Particles In The Atmosphere, LBL Report 9037, Conf. 7803101, UC-I1 June 1979.Google Scholar
- 10.R. E. Weiss, A. P. Waggoner, R. J. Charlson, D. L. Thorsell, J. S. Hall, and L. A. Riley, “Studies of the Optical, Physical and Chemical Properties of Light Absorbing Aerosols” in Carbonaceous Particles in the Atmosphere, Lawrence Berkeley Laboratory, March 20–22, 1978.Google Scholar
- 12.M. Sadler, R. J. Chanson, H. Rosen and T. Novakov, “An Intercomparison of the Integrating Plate and the Laser Transmission Methods for Determination of Aerosol Absorption Coefficients” LBL Report 11176, July 1980.Google Scholar
- 15.W. A. McClenny and R. W. Shaw, Environmental Sciences Research Laboratory, EPA, Research Triangle Park, N. C., Private Communication.Google Scholar
- 16.C. A. Bennett, Jr., R. R. Patty, and W. A. McClenny, “Photoacoustic Detection of Carbonaceous Particulates”, submitted to Appl. Optics.Google Scholar
- 17.J. L. Howell and R. A. Palmer, “Photoacoustic Analysis of Atmospheric Aerosol Filters” Paper No. 675, Pittsburgh Conference, Atlantic City, 13 March 1980.Google Scholar
- 19.H. Rosen and T. Novakov, “Optical Attenuation: A Measurement of the Absorbing Properties of Aerosol Particles” in the 1977–1978 Annual Report of the Energy and Environmental Division, Lawrence Berkeley Laboratory, University of California. LBL-8696, UC-11.Google Scholar