The use of7LiOH-impregnated filters for the collection of acidic gases and analysis by instrumental neutron activation analysis |
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| Authors: | David L. Finnegan Janet P. Kotra Diane M. Hermann William H. Zoller |
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| Affiliation: | (1) Los Alamos National Laboratory, MS-J514, 87545 Los Alamos, NM, USA;(2) Nuclear Regulatory Commission, Washington, DC, USA;(3) Department of Chemistry, University of Maryland, 20742 College Park, MD, USA;(4) Department of Chemistry, BG-10, University of Washington, 98195 Seattle, WA, USA |
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| Abstract: | A simple system was designed using7LiOH-impregnated filters to collect acidic gases from ambient air and from highly concentrated volcanic plumes or gas streams. These filters were developed for analysis using instrumental neutron activation analysis, but other analytical techniques could be used as well. The sampling system was designed to use a series of 1–3 M7LiOH-impregnated filters to collect high concentrations of acidic gases found in gas plumes of active volcanoes. The filters are quantitative for SO2 and the halide acids when sufficient base is present to neutralize the acidic species. Extremely high concentrations of SO2 may not be collected quantitatively since SO2 is a relatively weak Lewis acid compared to the halide acids. The acidic oxides of Sb, As, and Se were also collected quantitatively. A particle filter preceded the impregnated filters in order to remove particles from the fumes. This system has proven effective under difficult sampling conditions and, since it is portable and light weight, it could be used for many volcanological applications where high levels of acidic gaseous phase species need to be collected. |
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