Particle Size Distribution In Hygroscopic Aerosols
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Author | : George Richard Gillespie |
Publisher | : |
Total Pages | : 84 |
Release | : 1953 |
Genre | : Acids |
ISBN | : |
The selection and design of aerosol removal equipment depend largely on knowledge of the size of the particle. In this work the distribution of particle sizes of aerosols of sulfuric, phosphoric, hydrochloric, hydrobromic, chlorosulfonic, and nitric acids was measured by means of a four-stage, high velocity jet impactor. The effect of the relative humidity of the air system, the addition of foreign nuclei, the concentration of the aerosol particles and time on the size distribution was studied.
Author | : George Richard Gillespie |
Publisher | : |
Total Pages | : 128 |
Release | : 1951 |
Genre | : Acids |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : |
Release | : 1979 |
Genre | : |
ISBN | : |
Ambient aerosols frequently contain large proportions of hygroscopic inorganic salts such as sulfates and nitrates, which may induce adverse health effects upon inhalation. The inhaled salt particles are invariably exposed to a humid environment; their deposition along the respiratory tract will necessarily depend upon the size change resulting from water vapor condensation. This paper discusses the deliquescent properties of pure and mixed salt aerosols and the particle size change as a function of relative humidity. Experimental results are presented for the growth of mixed chlorides (NaCl-KCl), mixed sulfates (H2SO4-(NH4)2SO4), and mixed (NH4)2SOsub 4}-NH4NO3 aerosol systems. It is shown that the behavior of the mixed salt aerosols in a moist atmosphere can be predicted from phase diagrams and pertinent thermodynamic properties of the bulk solutions. The evaporation of a saline droplet in an atmosphere of decreasing humidities is also investigated experimentally. For each deliquescent salt aerosol, there is a threshold humidity below which the solution droplets will quickly evaporate to become crystalline particles. The information is useful in the selection of a suitable humidification procedure to generate test aerosols for exposure studies.
Author | : |
Publisher | : |
Total Pages | : 23 |
Release | : 1979 |
Genre | : |
ISBN | : |
Author | : Bernard G. Mendonça |
Publisher | : |
Total Pages | : 36 |
Release | : 1976 |
Genre | : Aerosols |
ISBN | : |
This report was adapted from a Master's thesis supported by an ERL long-term University assignment at Colorado State University Fort Collins, Colorado pg. ii
Author | : Laura B. Cook |
Publisher | : |
Total Pages | : 153 |
Release | : 2011 |
Genre | : Aerosols |
ISBN | : |
Examines the hygroscopic and morphological nature of various substances through the use of an Environmental Scanning Electron Microscope (ESEM). The hygroscopic growth and changes in morphology for pure-component aerosols were studied for particles size. Hygroscopic growth was observed through changes in relative humidity (RH) and hygroscopic growth curves were created. the hygroscopic growth of multi-component aerosol mixtures was studied using Hygroscopic Tandem Differential Mobility Analysis (HTDMA) . The size distribution for an aerosol stream was determined before and after the stream was subjected to an increase in relative humidity.
Author | : Lothar H. Ruhnke |
Publisher | : |
Total Pages | : 400 |
Release | : 1984 |
Genre | : Aerosols |
ISBN | : |
Author | : Keung Shan Woo |
Publisher | : |
Total Pages | : 384 |
Release | : 2003 |
Genre | : |
ISBN | : |
Author | : W. D. Griffiths |
Publisher | : Royal Society of Chemistry |
Total Pages | : 136 |
Release | : 1998 |
Genre | : Science |
ISBN | : |
This book provides a starting document to aid non-specialists in their understanding, valid operation and calibration of aerosol particle-size analysers.
Author | : Alan P. Waggoner |
Publisher | : |
Total Pages | : 56 |
Release | : 1977 |
Genre | : Aerosols |
ISBN | : |