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Deliquescence and Efflorescence of Potassium Salts Relevant to Biomass-Burning Aerosol Particles
Ist Teil von
Aerosol science and technology, 2009-08, Vol.43 (8), p.799-807
Ort / Verlag
Colchester: Taylor & Francis Group
Erscheinungsjahr
2009
Link zum Volltext
Quelle
Taylor & Francis
Beschreibungen/Notizen
Particles containing potassium salts are common in biomass burning plumes and include compounds such as KCl, KNO
3
, and K
2
SO
4
. We determined the deliquescence and efflorescence relative humidities of single- and multi-component potassium salts using an environmental transmission electron microscope and an environmental scanning electron microscope. KCl particles deliquesced at a relative humidity (RH) of 85% and effloresced at 56%. K
2
SO
4
particles deliquesced at 96% and effloresced at 60%. KNO
3
particles grew continuously with increasing humidity. If KNO
3
particles were heat-treated at 104°C overnight, they deliquesced at an RH above 90%. Atomized solutions of multi-component potassium compounds (KCl & KNO
3
and KCl & K
2
SO
4
) formed particles that contained distinct grains of each compound upon drying. Particles formed from the KCl & KNO
3
mixtures grew continuously with increasing humidity until deliquescence occurred at an RH of 82% and efflorescence occurred at 58%. Particles from the KCl & K
2
SO
4
mixture began to take up water at an RH of 84%. They deliquesced at >90% and effloresced at 52%. This work provides new data for mixed aqueous electrolytes that are important for atmospheric science. Efflorescence values for K
2
SO
4
, KNO
3
, and internally mixed particles of K
2
SO
4
and KCl are reported here for the first time.