Journal
ATMOSPHERIC CHEMISTRY AND PHYSICS
Volume 9, Issue 7, Pages 2289-2300Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-9-2289-2009
Keywords
-
Funding
- Columbia University Professional Schools Research Fellowship
- National Science Foundation
- NSF Award [CHE-0641523]
- New York State Office of Science, Technology, and Academic Research (NYSTAR)
Ask authors/readers for more resources
Light-absorbing and high-molecular-weight secondary organic products were observed to result from the reaction of glyoxal in mildly acidic (pH=4) aqueous inorganic salt solutions mimicking aqueous tropospheric aerosol particles. High-molecular-weight (500-600 amu) products were observed when ammonium sulfate ((NH4)(2)SO4) or sodium chloride (NaCl) was present in the aqueous phase. The products formed in (NH4)(2)SO4 or ammonium nitrate (NH4NO3) solutions absorb light at UV and visible wavelengths. Substantial absorption at 300-400 nm develops within two hours, and absorption between 400-600 nm develops within days. Pendant drop tensiometry measurements show that the products are not surface-active. The experimental results along with ab initio predictions of the UV/Vis absorption of potential products suggest a mechanism involving the participation of the ammonium ion. If similar products are formed in atmospheric aerosol particles, they could change the optical properties of the seed aerosol over its lifetime.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available