Influence of sample composition on aerosol organic and black carbon determinations

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In this paper we present results on characterization of filter-collected redwood (Sequoia sempevirens)-needle and eucalyptus smoke particles by thermal, optical, and solvent extraction methods. Our results demonstrate that organic and black carbon concentrations determined by thermal and optical methods are not only method dependent, but also critically influenced by the overall chemical composition of the samples. These conclusions are supported by the following: (1) the organic fraction of biomass smoke particles analyzed includes a component, ranging in concentration from about 6-20% of total carbon or from 16-30% of organic carbon, that is relatively non-volatile and has a combustion temperature close ... continued below

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20 p.

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Novakov, T. & Corrigan, C.E. July 1, 1995.

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Description

In this paper we present results on characterization of filter-collected redwood (Sequoia sempevirens)-needle and eucalyptus smoke particles by thermal, optical, and solvent extraction methods. Our results demonstrate that organic and black carbon concentrations determined by thermal and optical methods are not only method dependent, but also critically influenced by the overall chemical composition of the samples. These conclusions are supported by the following: (1) the organic fraction of biomass smoke particles analyzed includes a component, ranging in concentration from about 6-20% of total carbon or from 16-30% of organic carbon, that is relatively non-volatile and has a combustion temperature close to that of black carbon; (2) presence of K or Na in biomass smoke samples lowers the combustion temperatures of this organic component and of black carbon, making their combustion properties indistinguishable; (3) about 20% of total organic material is nonvolatile when heated to 550{degrees}C in an inert atmosphere. Consequently, thermal methods that rely on a specific temperature to separate organic from black carbon may either underestimate or overestimate the black and organic carbon concentrations, depending on the amounts of Na and K and on the composition and concentration of organic material present in a sample. These analytical uncertainties and, under some conditions, absorption by organic material may contribute to the variability of empirically derived proportionality between light transmission through filter deposits and black carbon concentrations.

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20 p.

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INIS; OSTI as DE96001311

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  • Chapman conference on biomass burning and global change, Williamsburg, VA (United States), 13-17 Mar 1995

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  • Other: DE96001311
  • Report No.: LBL--37513
  • Report No.: CONF-950376--3
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 122026
  • Archival Resource Key: ark:/67531/metadc618390

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  • July 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • April 5, 2016, 11:42 a.m.

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Novakov, T. & Corrigan, C.E. Influence of sample composition on aerosol organic and black carbon determinations, article, July 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc618390/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.