Comparison of measured particle lung-deposited surface area concentrations by an Aerotrak 9000 using size distribution measurements for a range of combustion aerosols

Anna Leavey, Jiaxi Fang, Manoranjan Sahu, Pratim Biswas

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Surface area in addition to mass concentration is increasingly being emphasized as an important metric representing potential adverse health effects from exposure to inhaled particles. Lungdeposited surface area (SA) concentrations for a variety of aerosols: coal, biomass, cigarette, incense, candle, and TiO2 were measured using an AeroTrak 9000 (TSI Incorporated) and compared with those calculated from number size distributions from a scanning mobility particle sizer (SMPS). Three methodologies to compute the SA concentrations using the International Commission on Radiological Protection's (ICRP) Lung Deposition model and an SMPS were compared. The first method calculated the SA from SMPS size distributions, while the second method used lognormal size distribution functions.Athird method generated a closed-form equation using the method of moments. All calculated SMPS SA data againstwhich themeasured SAdata were compared were generated using the first method only; however, the SA concentrations calculated from each of the three methods demonstrated strong correlations with each other. Overall, results between measured and calculated lung-deposited SA indicated strong positive linear associations (R2 0.78 - >0.99), moderately dependent on the type of aerosol. In all cases, the measured SA concentrations slightly underestimated those calculated from the SMPS data, with the exception of coal combustion particles. Although some dependency on aerosol material exists, the instrument measuring lung-deposited SA demonstrated consistent reliability across a range of concentrations for a range of materials. For optimal results however, applying a correction factor (CF) before taking the instrument to the field is recommended.

Original languageEnglish (US)
Pages (from-to)966-978
Number of pages13
JournalAerosol Science and Technology
Volume47
Issue number9
DOIs
StatePublished - 2013
Externally publishedYes

ASJC Scopus subject areas

  • Environmental Chemistry
  • Materials Science(all)
  • Pollution

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