Heterogeneous chemistry of glyoxal on acidic solutions. An oligomerization pathway for secondary organic aerosol formation. Academic Article uri icon

abstract

  • The heterogeneous chemistry of glyoxal on sulfuric acid surfaces has been investigated at various acid concentrations and temperatures, utilizing a low-pressure fast flow laminar reactor coupled to an ion drift-chemical ionization mass spectrometer (ID-CIMS). The uptake coefficient () of glyoxal ranges from (1.2 0.06) 10(-2) to (2.5 0.01) 10(-3) for 60-93 wt % H2SO4 at 253-273 K. The effective Henry's Law constant (H*) ranges from (98.9 4.9) 10(5) to (1.6 0.1) 10(5) M atm(-1) for 60-93 wt % at 263-273 K. Both the uptake coefficient and Henry's Law constant increase with decreasing acid concentration and temperature. Our results reveal a reaction mechanism of hydration followed by oligomerization for glyoxal on acidic media, indicating an efficient aqueous reaction of glyoxal on hygroscopic particles leading to secondary organic aerosol formation.

published proceedings

  • J Phys Chem A

author list (cited authors)

  • Gomez, M. E., Lin, Y., Guo, S., & Zhang, R.

citation count

  • 32

complete list of authors

  • Gomez, Mario E||Lin, Yun||Guo, Song||Zhang, Renyi

publication date

  • November 2014