Studies of the nature and reactivity of laboratory and atmospheric soot
The functional groups on the surface of n-hexane soot have been characterized using FTIR spectroscopy and wet chemical analyses. There is evidence for the presence of lactone besides anhydride groups on the soot surface, and the three bands in the 800 cm{sup {minus}1} region have been assigned to C-H bonds. The reactivity of the laboratory prepared n-hexane soot has been examined through its reaction with SO{sub 2} and O{sub 3}. The reaction of soot with SO{sub 2} was performed at room temperature, elevated temperatures, and in the presence of UV radiation. The results of this study suggest that, sulfate on the soot surface is formed when mixtures of soot, SO{sub 2} and water are exposed to UV light. Spectroscopic, gravimetric, kinetic studies and wet chemical analyses of the soot-ozone reaction were carried out. A complete understanding of the behaviors of both soot and ozone was obtained. In collaboration with the Colorado Department of Health, Air Pollution Division and the Public Service Company of Colorado, a study of the Denver aerosol during the winter of 1986-87 was carried out. A total of 150 PM{sub 10} quartz filters were collected from Welby, CAMP, Downtown, and Englewood and analyzed for soot, sulfate, nitrate, and Pb. Teflon and nylon filters packs were also exposed at Welby, Downtown, and Englewood and analyzed for sulfate, nitrate, and Pb. Most of the chemical components of the Denver aerosol have been characterized, and correlated to each other and to the sources types. These aerosol components are also correlated to visibility reduction through measurements of the absorption extinction coefficients of the particles collected on the filters.
- Research Organization:
- Denver Univ., CO (USA)
- OSTI ID:
- 5628636
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020900* -- Petroleum-- Environmental Aspects
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ACTIVATION ENERGY
AIR POLLUTION MONITORING
AIR SAMPLERS
ALKANES
ANHYDRIDES
ATMOSPHERIC CHEMISTRY
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
COLORADO
COMBUSTION
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY
EQUIPMENT
ESTERS
FEDERAL REGION VIII
FILTERS
FOURIER TRANSFORMATION
HETEROCYCLIC COMPOUNDS
HEXANE
HYDROCARBONS
INFRARED SPECTRA
INTEGRAL TRANSFORMATIONS
KINETICS
LACTONES
LEAD
METALS
NITRATES
NITROGEN COMPOUNDS
NORTH AMERICA
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
OZONE
PARTICLES
PARTICULATES
RADIATIONS
REACTION KINETICS
SAMPLERS
SAMPLING
SOOT
SPECTRA
STRUCTURAL CHEMICAL ANALYSIS
SULFATES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES
TRANSFORMATIONS
ULTRAVIOLET RADIATION
URBAN AREAS
USA