Document Detail


Characterisation of 'Sulfurous Acid', Sulfite and Bisulfite Aerosol Systems.
MedLine Citation:
PMID:  22471624     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Acidic tropospheric aerosols contain inorganic species such as 'sulfurous' acid (H2SO3). As the main alkaline species, ammonia (NH3) plays an important role in the heterogeneous neutralisation of these acidic aerosols. An aerosol flow-tube apparatus was used to obtain simultaneous optical and size distribution measurements using FTIR and SMPS measurements respectively as a function of relative humidity and aerosol chemical composition. A novel chemiluminescence apparatus was also used to measure ammonium ion concentration [NH4+]. The interactions between ammonia and hydrated sulfur dioxide (SO2.H2O) were studied at different humidities and concentrations. SO2.H2O is an important species as it represents the first intermediate in the overall atmospheric oxidation process of sulfur dioxide to sulfuric acid (H2SO4). This complex was produced within gaseous, aqueous and aerosol SO2 systems. The addition of ammonia, gave mainly hydrogen sulfite (SHO3-) tautomers and disulfite ions (S2O52-). These species were prevalent at high humidities enhancing the aqueous nature of sulfur (IV) species. Their weak acidity is evident due to the low [NH4+] produced. Size distributions obtained correlated well with the various stages of particulate compositional development.
Authors:
Thomas Michael Townsend; Arnaud Allanic; Colette Noonan; John Robert Sodeau
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-4-3
Journal Detail:
Title:  The journal of physical chemistry. A     Volume:  -     ISSN:  1520-5215     ISO Abbreviation:  -     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-4-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9890903     Medline TA:  J Phys Chem A     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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