Studies of toxic aerosols via elastic and inelastic light scattering

Journal Article · Mon Feb 01 00:00:00 EST 1993 · Aerosol Science and Technology; (United States)

DOI:https://doi.org/10.1080/02786829308959594· OSTI ID:6574688

Foss, W; Li, W; Allen, T M; Blair, D S; Davis, E J ^[1]

---

1. Univ. of Washington, Seattle (United States)

Evaporation rates and chemical characteristics of potentially toxic aerosols have been determined by elastic and inelastic light-scattering measurements. The aerosol systems examined were a commercial catalyst consisting of a mixture of stannous octanoate (SNO) and 2-ethylhexanoic acid (EHA) and droplets emitted from open tanks of chromic acid solutions used for anodizing aluminum. The heavy metals contained in these aerosols represent a danger to the workplace if such materials are inhaled. Nanogram amounts of the solutions were studied by suspending single microdroplets in electrodynamic balances in a flow of air to measure evaporation rates and to obtain Raman spectra. Elastic scattering data include phase functions and morphological resonance spectra from which droplet sizes are determined. The inelastic light-scattering data or Raman spectra provide molecular vibrational bond information. It was found that EHA spectra agree with bulk data in the literature, and that SNO Raman spectra, which are not available in the literature, are consistent with infrared spectra for bulk SNO. At room temperature the vapor pressure of SNO is on the order of 0.01 Pa while that of EHA is on the order of 0.1 Pa. Raman data for the residue of evaporated chromic acid solutions show the presence of chromium oxides (Cr[sup 6+] compounds), surfactants, and bound (nonvolatile) water. 31 refs., 14 figs.

• OSTI ID: 6574688
• Journal Information: Aerosol Science and Technology; (United States), Vol. 18:2; ISSN 0278-6826
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AEROSOLS
EVAPORATION
LIGHT SCATTERING
RAMAN SPECTROSCOPY
BALANCES
CARBOXYLIC ACIDS
CATALYSTS
CHROMIC ACID
MATHEMATICAL MODELS
ORGANOMETALLIC COMPOUNDS
TIN COMPOUNDS
TOXIC MATERIALS
CHROMIUM COMPOUNDS
COLLOIDS
DISPERSIONS
HAZARDOUS MATERIALS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
LASER SPECTROSCOPY
MATERIALS
MEASURING INSTRUMENTS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
SCATTERING
SOLS
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS
WEIGHT INDICATORS
540120* - Environment
Atmospheric- Chemicals Monitoring & Transport- (1990-)
400102 - Chemical & Spectral Procedures