Record Display for the EPA National Library Catalog


Main Title Physical and Chemical Characterization of Indoor Aerosols Resulting from the Use of Tap Water in Portable Home Humidifiers.
Author Highsmith, V. R. ; Hardy, R. J. ; Costa, D. L. ; Germani, M. S. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. ;Morrison-Knudsen Co., Inc., Boise, ID. ;McCrone Associates, Inc., Westmont, IL.
Publisher c1992
Year Published 1992
Report Number EPA/600/J-92/187;
Stock Number PB92-188937
Additional Subjects Aerosols ; Water ; Air quality ; Houses ; Potable water ; Humidifiers ; Inorganic salts ; Water analysis ; Indoor air pollution ; Reprints ; Boise(Idaho) ; Bottled water
Library Call Number Additional Info Location Last
NTIS  PB92-188937 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 10p
An indoor air quality study was conducted in Boise, ID, residences to evaluate the range of aerosol concentrations that result from using tap water in portable home humidifiers and to characterize the physical and chemical properties of the humidifier aerosol. Aerosols having particles smaller than 10 micrometers (PM10) concentrations exceeded 650 microgram/cu m and 7000 microgram/cu m when an ultrasonic humidifier, charged with tap water containing 303 mg/L of dissolved impurities, was operated under whole-house and single-room conditions, respectively. Elements measured in high concentrations were uniformly present as soluble salts in both the fine and coarse particles with small differences observed between the ultrasonic and impeller humidifier-generated aerosols. In a separate study, nearly 50% of 39 samples of U.S. commercial bottled waters collected had dissolved mineral concentrations exceeding 10 mg/L while 4 samples exceeded 100 mg/L. The results of the limited-scale study suggest that personal exposures to ultrasonic and impeller humidifier-generated aerosols can be minimized by using water of low impurities.