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Chemical Ionization Mass Spectrometry (Cims) May Not Measure All Gas-phase Sulfuric Acid If Base Molecules Are Present : Volume 10, Issue 12 (15/12/2010)

By Kurtén, T.

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Book Id: WPLBN0003979577
Format Type: PDF Article :
File Size: Pages 30
Reproduction Date: 2015

Title: Chemical Ionization Mass Spectrometry (Cims) May Not Measure All Gas-phase Sulfuric Acid If Base Molecules Are Present : Volume 10, Issue 12 (15/12/2010)  
Author: Kurtén, T.
Volume: Vol. 10, Issue 12
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany


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Ortega, I. K., Petäjä, T., Kulmala, M., Worsnop, D. R., Smith, J., Ehn, M.,...Mauldin, L. (2010). Chemical Ionization Mass Spectrometry (Cims) May Not Measure All Gas-phase Sulfuric Acid If Base Molecules Are Present : Volume 10, Issue 12 (15/12/2010). Retrieved from

Description: Division of Atmospheric Science, Department of Physics, P.O. Box 64, 00014 University of Helsinki, Finland. The state-of-the art method for measuring atmospheric gas-phase sulfuric acid is chemical ionization mass spectrometry (CIMS) based on nitrate reagent ions. Using computed proton affinities and reaction thermodynamics for the relevant charging reactions, we show that in the presence of strong bases such as amines, which tend to cluster with the sulfuric acid molecules, a significant fraction of the total gas-phase sulfuric acid may not be measured by a CIMS instrument. If this is the case, this effect has to be taken into account in the interpretation of atmospheric sulfuric acid measurement data, as well as in intercomparison of different CIMS instruments, which likely have different susceptibilities to amine-sulfuric acid clustering.

Chemical ionization mass spectrometry (CIMS) may not measure all gas-phase sulfuric acid if base molecules are present

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