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Authors: Aiuppa, A.* 
Bagnato, E.* 
Witt, M. L. I.* 
Mather, T. A.* 
Parello, F.* 
Pyle, D. M.* 
Martin, R. S.* 
Title: Real-time simultaneous detection of volcanic Hg and SO2 at La Fossa Crater Vulcano (Aeolian Islands, Sicily)
Issue Date: 2007
Series/Report no.: /34 (2007)
DOI: 10.1029/2007GL030762
Keywords: Mercury
Fumarolic condensates
Volcanic emissions
Subject Classification04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
Abstract: Measuring Hg/SO2 ratios in volcanic emissions is essential for better apportioning the volcanic contribution to the global Hg atmospheric cycle. Here, we report the first real-time simultaneous measurement Hg and SO2 in a volcanic plume, based on Lumex and MultiGAS techniques, respectively. We demonstrate that the use of these novel techniques allows the measurements of Hg/SO2 ratios with a far better time resolution than possible with more conventional methods. The Hg/SO2 ratios in the plume of F0 fumarole on La Fossa Crater, Vulcano Island spanned an order of magnitude over a 30 minute monitoring period, but was on average in qualitative agreement with the Hg/SO2 ratio directly measured in the fumarole (mean plume and fumarole ratios being 1.09 x 10-6 and 2.9 x 10-6, respectively). The factor 2 difference between plume and fumarole compositions provides evidence for fast Hg chemical processing the plume.
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