Displacement of ammonium from aerosol particles by uptake of triethylamine

Lap P. Chan, Chak K. Chan

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


The displacement of ammonium by triethylammonium (TEAH) in aerosol particles of about 15-35 μm in diameter was investigated using an electrodynamic balance (EDB) coupled with in situ Raman spectroscopy. The phase state of particles played a crucial role in the extent of triethylamine (TEA) uptake. At 50 or 75% relative humidity (RH), the heterogenous uptake of about 40-ppm TEA by aqueous ammonium salts of sulfate [(NH 4) 2SO 4], bisulfate (NH 4HSO 4), nitrate (NH 4NO 3), chloride (NH 4Cl), and oxalate [(NH 4) 2C 2O 4] led to increases in particle mass of over 90%. A complete displacement of ammonium by TEAH was confirmed by direct EDB mass measurements and the Raman spectra obtained. TEAH sulfate was formed during the exposure of aqueous droplets of (NH 4) 2SO 4 and NH 4HSO 4 to TEA vapor at 50% RH; but a fraction of it decomposed to TEAH bisulfate when the TEA supply was removed. Crystalline solid particles of (NH 4) 2SO 4 and (NH 4) 2C 2O 4 experienced small mass increases of
Original languageEnglish (US)
Pages (from-to)236-247
Number of pages12
JournalAerosol Science and Technology
Issue number2
StatePublished - Feb 1 2012
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2023-07-06

ASJC Scopus subject areas

  • Environmental Chemistry
  • Materials Science(all)
  • Pollution


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