Sign up & Download
Sign in

Seasonal variations of concentrations and optical properties of water soluble HULIS collected in urban environments

by C. Baduel, D. Voisin, J. L. Jaffrezo
Atmospheric Chemistry and Physics ()

Abstract

Major contributors to the organic aerosol include water-soluble macromolecular compounds (e.g. HULISWS: Water Soluble Humic LIke Substances). The nature and sources of HULISWS are still largely unknown. This work is based on a monitoring in six different French cities performed during summer and winter seasons. HULISWS analysis was performed with a selective method of extraction complemented by carbon quantification. UV spectroscopy was also applied for their chemical characterisation. HULISWS carbon represent an important contribution to the organic aerosol mass in summer and winter, as it accounts for 12-22% of Organic Carbon and 34-40% of Water Soluble Organic Carbon. We found strong differences in the optical properties (specific absorbance at 250, 272, 280 nm and E2/E3 ratio) and therefore in the chemical structure between HULISWS from samples of summer- and wintertime. These differences highlight different processes responsible for emissions and formation of HULISWS according to the season, namely biomass burning in winter, and secondary processes in summer. Specific absorbance can also be considered as a rapid and useful indicator of the origin of HULISWS in urban environment.

Cite this document (BETA)

Readership Statistics

16 Readers on Mendeley
by Discipline
 
 
 
by Academic Status
 
31% Post Doc
 
25% Ph.D. Student
 
13% Researcher (at a non-Academic Institution)
by Country
 
6% United Kingdom

Sign up today - FREE

Mendeley saves you time finding and organizing research. Learn more

  • All your research in one place
  • Add and import papers easily
  • Access it anywhere, anytime

Start using Mendeley in seconds!

Already have an account? Sign in