Henry's law constants of diacids and hydroxy polyacids: recommended values
In spite of the importance of diacids and functionalised diacids for organic aerosol formation through aqueous-phase processes in droplets and aerosol water, there seems to be no reliable set of experimental values for their Henry's law constants (HLCs). We show that their estimation through th...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2014-03-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/14/2699/2014/acp-14-2699-2014.pdf |
| Summary: | In spite of the importance of diacids and functionalised diacids for organic
aerosol formation through aqueous-phase processes in droplets and aerosol
water, there seems to be no reliable set of experimental values for their
Henry's law constants (HLCs). We show that their estimation through the use of
infinite dilution activity coefficients is also prone to error. Here we
present HLC values for diacids and hydroxy polyacids determined from
solubilities, water activities and vapour pressures of solids or solutions,
by employing thermodynamic relationships. The vapour pressures are found to
be the largest source of error, but the analysis of the obtained HLC points
to inconsistencies among specific vapour pressure data sets. Although there
is considerable uncertainty, the HLC defined as aqueous concentration per
unit gaseous partial pressure of linear α- and ω-diacids appear to
be higher than estimated by the often cited review work of
Saxena and Hildemann (1996). |
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| ISSN: | 1680-7316 1680-7324 |