The (NH4)2SO4-Na2SO4-H2O system: comparison of deliquescence humidities measured in the field and estimated from laboratory measurements and thermodynamic modeling

S. Koloutsou-Vakakis, M. J. Rood

Research output: Contribution to journalArticlepeer-review

Abstract

Ambient aerosol, sampled in Riverside, California, USA, was characterized by measuring its light scattering coefficient as a function of controlled relative humidity and thermal treatment. Results from field experiments have indicated deliquescence humidities in the 74-79% range, after chemically neutralizing the aerosol with NH3 and preheating the sample to 190°C. Preheating was used to remove more volatile material from the aerosol particles, such as NH4NO3 which could inhibit the occurrence of deliquescence. The measured deliquescence humidity values were less than expected for pure (NH4)2SO4, but their mean is, at the 95% confidence level, the same with the means of predictions for the deliquescence humidities determined from the phase diagram and thermodynamic modeling for the (NH4)2SO4-Na2SO4-H2O system. -from Authors

Original languageEnglish (US)
Pages (from-to)1-15
Number of pages15
JournalTellus, Series B
Volume46 B
Issue number1
DOIs
StatePublished - Jan 1 1994

ASJC Scopus subject areas

  • Atmospheric Science

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