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Determination Of Optical Properties Of Secondary Organic Aerosols Using Uv-Vis Spectroscopy, Vanessa Selimovic, Matthew E. Wise, John Shilling

Matthew E. Wise

• Aerosols interact differently with the atmosphere depending on:
• Composition
• Size
• Phase
• Reactivity
• Optical Properties
• Reactivity with atmosphere determines impact on Earth’s radiative budget

[excerpt]

Digital Fabrication Of An Atmospheric Aerosol Impactor, Stefan J. Vincent, Shawn Daley, Matthew E. Wise

Matthew E. Wise

Atmospheric aerosol (AA) particles are defined as solid or liquid particles suspended in the air. AA particles smaller than 10 μm (1x10^-5 meters) in diameter are small enough to bypass the upper respiratory system which functions as a filter for harmful substances entering the lungs. AA particles can be collected using a device called an aerosol impactor. After collection, the particles can be analyzed offline for chemical composition using a variety of analytical techniques. The weight of a commercially manufactured AA particle impactor poses an issue if it is attached to a mobile AA particle sampling platform such as …

Ryan Caylor, Ryan Caylor

Matthew E. Wise

Avery Hong, Avery Hong

Matthew E. Wise

Stefan Vincent, Stefan Vincent

Matthew E. Wise

Cole Crosby, Cole Crosby

Matthew E. Wise

Determination Of The Optical Properties Of Secondary Organic Aerosol Particles, Matthew E. Wise, John Shilling, Felisha Imholt, Ryan Caylor

Matthew E. Wise

The enhanced greenhouse effect is currently considered to be our most important global environmental problem. While the magnitude of radiation absorbed by greenhouse gases is known to a high certainty, the absorption of radiation by atmospheric aerosol particles is not. In the initial Visiting Faculty Program application, we proposed the use of an ultraviolet-visible (UV/Vis) spectrometer equipped with a liquid waveguide capillary flow cell to determine the extent to which secondary organic aerosol particles (SOA) absorb visible light. Early in the research period, the UV/Vis technique was optimized for three solvent systems (methanol, water and 0.1 M hydrochloric acid). Using …

Determination Of Total Peroxide Content In Secondary Organic Aerosol Particles, Matthew E. Wise, John Shilling, Ryan Caylor

Matthew E. Wise

Secondary organic aerosol particles (SOA) formed from the oxidation of monoterpenes can impact the Earth’s radiation balance, act as cloud condensation nuclei and negatively affect human health. In the initial Visiting Faculty Program application, we proposed the use of an ultraviolet-visible spectrometer equipped with a liquid waveguide capillary flow cell to determine the extent to which SOA absorb visible light. The inclusion of Concordia University in the Secondary Organic Aerosol From Forest Emissions Experiment (SOAFFEE) laboratory campaign at PNNL necessitated a change in the proposed experiments. An iodometric-spectrophotometric (IS) technique was developed to quantify the total peroxide content in SOA. …

Vanessa Selimovic, Vanessa Selimovic

Matthew E. Wise

Felisha Imholt, Felisha Imholt

Matthew E. Wise

Peroxide Content Of Secondary Organic Aerosol, Ryan Caylor, Matthew E. Wise, John Shilling

Matthew E. Wise

Determination Of Total Peroxide Content In Secondary Organic Aerosol Particles, Matthew E. Wise

Matthew E. Wise

Secondary organic aerosol particles (SOA) formed from the oxidation of monoterpenes can impact the Earth’s radiation balance, act as cloud condensation nuclei and negatively affect human health. In the initial Visiting Faculty Program application, we proposed the use of an ultraviolet-visible spectrometer equipped with a liquid waveguide capillary flow cell to determine the extent to which SOA absorb visible light. The inclusion of Concordia University in the Secondary Organic Aerosol From Forest Emissions Experiment (SOAFFEE) laboratory campaign at PNNL necessitated a change in the proposed experiments. An iodometric-spectrophotometric (IS) technique was developed to quantify the total peroxide content in SOA. …

Composition And Optical Properties Of Secondary Organic Aerosol Particles, Felisha Imholt, Ryan Caylor, Matthew E. Wise, John Shilling

Matthew E. Wise

No abstract provided.

Optical Properties Of Secondary Organic Aerosols, Felisha Imholt, Ryan Caylor, Matthew E. Wise, John Shilling

Matthew E. Wise

Determination Of The Optical Properties Of Secondary Organic Aerosol Particles, Matthew E. Wise

Matthew E. Wise

The enhanced greenhouse effect is currently considered to be our most important global environmental problem. While the magnitude of radiation absorbed by greenhouse gases is known to a high certainty, the absorption of radiation by atmospheric aerosol particles is not. In the initial Visiting Faculty Program application, we proposed the use of an ultraviolet-visible (UV/Vis) spectrometer equipped with a liquid waveguide capillary flow cell to determine the extent to which secondary organic aerosol particles (SOA) absorb visible light. Early in the research period, the UV/Vis technique was optimized for three solvent systems (methanol, water and 0.1 M hydrochloric acid). Using …

Vanessa Selimovic, Vanessa Selimovic

Matthew E. Wise

Vanessa graduated from Concordia University in April of 2014 with a B.A. in chemistry and a minor in biology. She was accepted into the atmospheric/analytical chemistry Ph.D. program at the University of Montana, Missoula in 2015. In her free time she enjoys hiking, reading, and learning new things.

Determining The Optical Properties Of Secondary Organic Aerosols Using Uv/Vis Spectroscopy, Vanessa Selimovic

Matthew E. Wise

Atmospheric light-absorbing carbon (LAC) particles, which include black carbon (BC) and brown carbon (BrC) particles play an important role in global climate change. Currently, optical properties of BC are well defined, with studies showing absorption of light by BC at wavelengths above ~500 nm. At lower wavelengths of the visible light spectrum (300-500 nm), light absorption by BrC may be substantial. However, the extent of absorption is dependent on accurate knowledge of the optical properties of BrC, which are currently not well established. Optical properties of secondary organic aerosols (SOA), a variant of BrC, have been determined, but only for …