Record Display for the EPA National Library Catalog

RECORD NUMBER: 27 OF 47

OLS Field Name OLS Field Data
Main Title Effect of Hygroscopic Growth upon the Regional Dispersion of Particulates in Human Airways.
Author Martonen, T. B. ; Graham, R. C. ;
CORP Author Northrop Services, Inc., Research Triangle Park, NC.;Health Effects Research Lab., Research Triangle Park, NC.
Year Published 1987
Report Number EPA-68-02-4032; EPA/600/D-87/171;
Stock Number PB87-196499
Additional Subjects Ventilation ; Respiration ; Toxicity ; Aerosols ; Hazardous materials ; Air pollution ; Dispersion ; Hygroscopicity ; MMAD(Mass Median Aerodynamic Diameter)
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB87-196499 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/21/1988
Collation 17p
Abstract
To improve aerosol therapy regimens or to assess the health hazards of inhaled toxic particulates, the dose delivered to the human respiratory tract must be determined. The efficiency with which an aerosol is deposited in various compartments of the tract is a function of its mass median aerodynamic diameter, MMAD (Task Group on Lung Dynamics, 1966). If an airborne particle is hygroscopic, it will change in geometric diametrer and density as a result of water vapor uptake; its MMAD, therefore, will vary with location throughout the human respiratory tract. As a result, its dose distribution will differ from that for a nonhygroscopic (i.e., hydrophobic) aerosol of identical inhaled MMAD.