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The Effect of Fatty Acid Surfactants on the Uptake of Nitric Acid to Deliquesced Nacl Aerosol : Volume 8, Issue 1 (11/01/2008)

By Stemmler, K.

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Book Id: WPLBN0003979170
Format Type: PDF Article :
File Size: Pages 39
Reproduction Date: 2015

Title: The Effect of Fatty Acid Surfactants on the Uptake of Nitric Acid to Deliquesced Nacl Aerosol : Volume 8, Issue 1 (11/01/2008)  
Author: Stemmler, K.
Volume: Vol. 8, Issue 1
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2008
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Ammann, M., Vlasenko, A., Guimbaud, C., & Stemmler, K. (2008). The Effect of Fatty Acid Surfactants on the Uptake of Nitric Acid to Deliquesced Nacl Aerosol : Volume 8, Issue 1 (11/01/2008). Retrieved from http://www.ebooklibrary.org/


Description
Description: Laboratory of Radio- and Environmental Chemistry, Paul Scherrer Institute, 5232 Villigen, Switzerland. Surface active organic compounds have been observed in marine boundary layer aerosol. Here, we investigate the effect such surfactants have on the uptake of nitric acid (HNO3), an important removal reaction of nitrogen oxides in the marine boundary layer. The uptake of gaseous HNO3 on deliquesced NaCl aerosol was measured in a flow reactor using HNO3 labelled with the short-lived radioactive isotope 13N. The uptake coefficient γ on pure deliquesced NaCl aerosol was γ=0.5±0.2 at 60% relative humidity and 30 ppb HNO3(g). The uptake coefficient was reduced by a factor of 5–50 when the aerosol was coated with saturated linear fatty acids with carbon chain lengths of 18 and 15 atoms in monolayer quantities. In contrast, neither shorter saturated linear fatty acids with 12 and 9 carbon atoms, nor coatings with the unsaturated oleic acid (C18, cis-double bond) had a detectable effect on the rate of HNO3 uptake. It is concluded that it is the structure of the monolayers formed, which determines their resistance towards HNO3 uptake. Fatty acids (C18 and C15), which form a highly ordered film in the so-called liquid condensed state, represent a significant barrier towards HNO3 uptake, while monolayers of shorter-chain fatty acids (C9, C12) and of the unsaturated oleic acid form a less ordered film in the liquid expanded state and do not hinder the uptake. Similarly, high contents of humic acids in the aerosol, a structurally inhomogeneous, quite water soluble mixture of oxidised high molecular weight organic compounds did not affect HNO3 uptake. As surfactant films on naturally occurring aerosol are expected to be less structured due to their chemical inhomogeneity, it is likely that their inhibitory effect on HNO3 uptake is smaller than that observed here for the C15 and C18 fatty acid monolayers.

Summary
The effect of fatty acid surfactants on the uptake of nitric acid to deliquesced NaCl aerosol

Excerpt
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