Ambient sulfate aerosol deposition in man: modeling the influence of hygroscopicity. | Zendy

T.B. Martonen | Zendy; A E Barnett | Zendy; Frederick J. Miller | Zendy

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Ambient sulfate aerosol deposition in man: modeling the influence of hygroscopicity.

Author(s) -

T.B. Martonen,

A E Barnett,

Frederick J. Miller

Publication year - 1985

Publication title -

environmental health perspectives

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.257

H-Index - 282

eISSN - 1552-9924

pISSN - 0091-6765

DOI - 10.1289/ehp.856311

Subject(s) - aerosol , relative humidity , deposition (geology) , respiratory tract , aerodynamic diameter , sulfate , environmental chemistry , inhalation , inhalation exposure , environmental science , particle (ecology) , humidity , atmospheric sciences , sulfate aerosol , mass concentration (chemistry) , chemistry , respiratory system , meteorology , medicine , anesthesia , geology , geography , paleontology , oceanography , organic chemistry , sediment

Atmospheric sulfate aerosols [H2SO4, (NH4)2SO4, and NH4HSO4] are of international concern because of their global prevalence and potential irritant or toxic effects on humans. To assess hazards following inhalation exposure, the total dose delivered to the human respiratory tract and its regional distribution must be determined. The mass median aerodynamic diameter of the inhaled aerosol will influence the sites of deposition in the respiratory tract. Atmospheric sulfate aerosols are hygroscopic and will have changing particle sizes and densities as they absorb water vapor in the humid environment of the human respiratory tract. Experimental and theoretical data that describe particle size as a function of temperature and relative humidity were used in computer subroutines of an aerosol deposition model in order to calculate the dose dispersion of H2SO4, (NH4)2SO4, and NH4HSO4 aerosols in man. Different temperature and relative humidity environments that approximately correspond to nasal and oral breathing were studied. The predicted deposition patterns are very different from those of nonhygroscopic aerosols with identical inhaled mass median aerodynamic diameter values.

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