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FRANCESCO PARELLO

Real-time simultaneous detection of volcanic Hg and SO2 at La Fossa Crater, Vulcano (Aeolian Islands, Sicily)

  • Autori: Aiuppa, A.; Bagnato, E.; Witt, M.; Mather, T.; Parello, F.; Pyle, D.; Martin, R.
  • Anno di pubblicazione: 2007
  • Tipologia: Articolo in rivista (Articolo in rivista)
  • Parole Chiave: Hg
  • OA Link: http://hdl.handle.net/10447/10369

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 of 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 ratio in the plume of FO 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 × 10-6 and 2.9 × 10-6, respectively). The factor 2 difference between plume and fumarole compositions provides evidence for fast Hg chemical processing, the plume.