Dry deposition removal of carbonaceous particles produced by biomass burning in panama

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Six dry deposition monitoring stations were positioned throughout Coclé Province (central Panama) in 1981 in order to collect particulates produced during the period of agricultural burning. The stations housed glass plates coated with a film of vaseline. Samples collected at weekly intervals were treated with acids and a mild oxidant to remove clay minerals and organic material, leaving a residue which was largely carbonized plant material (elemental carbon). The weekly elemental carbon fluxes were strongly correlated with the land area burned in the region. During the 3-month burning period, dry deposition fluxes of elemental carbon ranged from 1.5 to 7.7 × 10−5 mg C cm−2 d−1. Size distribution analyses of the carbonaceous particles indicated that most of the dry deposition elemental carbon mass was carried by particles greater than 2 μm in diameter. Submicrometer particles, while abundant in number, accounted for less than 15% of the mass. This contrasts with the importance of submicrometer elemental carbon particles in mass size distributions of Panamanian aerosols. Electron micrographs of the carbonaceous particles greater than 38 μm suggest that the majority were grass epidermal particles.

Original languageEnglish (US)
Pages (from-to)131-139
Number of pages9
JournalAerosol Science and Technology
Issue number1
StatePublished - 1989
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Chemistry
  • Materials Science(all)
  • Pollution


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