Document Detail


Multiphase chemistry of ozone on fulvic acids solutions.
MedLine Citation:
PMID:  19174887     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
By means of a wetted-wall flow tube, we studied the multiphase chemistry of ozone on aqueous solutions containing fulvic acids (FA), taken as proxies for atmospheric "humic like substances", so-called HULIS. In these experiments, the loss of gaseous O3 was monitored by UV-visible absorption spectroscopy at the reactor outlet (i.e., after contact between the gaseous and liquid phases). Measurements are reported in terms of dimensionless uptake coefficients (gamma) in the range from 1.6 x 10(-7) to 1.3 x 10(-5) depending on ozone gas phase concentration (in the range from 6.6 to 34.4 x 10(11) molecules cm(-3)) and fulvic acid aqueous concentration (in the range from 0.25 to 2.5 mg L(-1)) and pH (in the range from 2.5 to 9.2). The measured kinetics were observed to follow a Langmuir-Hinshelwood type mechanism, in which O3 first adsorbs on the liquid surface and then reacts with the Fulvic Acid molecules. The reported uptake coefficients are greatly increased over those measured on pure water, demonstrating that the presence in solution of fulvic acids does greatly enhance the uptake kinetics. Accordingly, the chemical interactions of fulvic acids (or HULIS) may be a driving force for the uptake of ozone on liquid organic aerosols and can also represent an important mechanism for the O3 deposition to the rivers and lakes.
Authors:
Marcello Brigante; Barbara D'Anna; Pierre Conchon; Christian George
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental science & technology     Volume:  42     ISSN:  0013-936X     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2009-01-29     Completed Date:  2009-02-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  9165-70     Citation Subset:  IM    
Affiliation:
Université de Lyon, Lyon, F-69626, France.
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MeSH Terms
Descriptor/Qualifier:
Benzopyrans / chemistry*
Hydrogen-Ion Concentration
Ozone / chemistry*
Solutions
Time Factors
Chemical
Reg. No./Substance:
0/Benzopyrans; 0/Solutions; 10028-15-6/Ozone; 479-66-3/fulvic acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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