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Co-adsorption of acetic acid and nitrous acid on ice.
MedLine Citation:
PMID:  20485807     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
The co-adsorption of acetic and nitrous acids was investigated in a packed ice bed flow tube at atmospheric pressure in the temperature range of 213-243 K. The uptake of acetic acid (CH3COOH) on ice was probed by means of a chemical ionisation quadrupole mass spectrometer. For the interaction of HONO with ice, molecules labelled with the short-lived radioisotope 13N (t1/2 = 10 min) were used. First, the retention time of acetic acid in the packed ice beds was measured in the absence of HONO and used to calculate the linear partition coefficient, K(Lin,C,AA) and the dimensionless adsorption partition coefficient, K0(p,AA). The temperature dependence of KLin,C,AA was found to be K(Lin,C,AA)[m] = 1.9 x 10(-14) exp(7.4 x 10(3)/T) in good agreement with previous studies. No evidence of diffusion of acetic acid in the bulk of the ice matrix was observed. The co-adsorption measurements are well reproduced by a competitive Langmuir adsorption model and showed that the partition coefficients derived for single compounds can also be applied to this more complex system. Further, the measurements revealed that the bulk uptake of HONO is not influenced by the presence of acetic acid. The results are discussed in terms of partitioning of trace gases in snowpacks.
Authors:
Michaël Kerbrat; Thomas Huthwelker; Thorsten Bartels-Rausch; Heinz W Gäggeler; Markus Ammann
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Publication Detail:
Type:  Journal Article     Date:  2010-05-19
Journal Detail:
Title:  Physical chemistry chemical physics : PCCP     Volume:  12     ISSN:  1463-9084     ISO Abbreviation:  Phys Chem Chem Phys     Publication Date:  2010 Jul 
Date Detail:
Created Date:  2010-06-23     Completed Date:  2010-09-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100888160     Medline TA:  Phys Chem Chem Phys     Country:  England    
Other Details:
Languages:  eng     Pagination:  7194-202     Citation Subset:  -    
Affiliation:
Paul Scherrer Institute, Laboratory of Radiochemistry and Environmental Chemistry, CH-5232 Villigen, Switzerland.
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