Search results for " sulfur and halogen"

showing 2 items of 2 documents

Active alkaline traps to determine acidic-gas ratios in volcanic plumes: Sampling techniques and analytical methods

2014

In situ measurements have been the basis for monitoring volcanic gas emissions for many years and—being complemented by remote sensing techniques—still play an important role to date. Con- cerning in situ techniques for sampling a dilute plume, an increase in accuracy and a reduction of detection limits are still necessary for most gases (e.g., CO2, SO2, HCl, HF, HBr, HI). In this work, the Raschig-Tube tech- nique (RT) is modified and utilized for application on volcanic plumes. The theoretical and experimental absorption properties of the RT and the Drechsel bottle (DB) setups are characterized and both are applied simultaneously to the well-established Filter packs technique (FP) in the …

Detection limitgeographyAnalytegeography.geographical_feature_categoryalkaline traps plume sampling sulfur and halogen Etna volcanoDifferential optical absorption spectroscopyIon chromatographyMineralogySettore GEO/08 - Geochimica E VulcanologiaPlumeGeophysicsVolcanoGeochemistry and PetrologyAbsorption (electromagnetic radiation)Inductively coupled plasma mass spectrometryGeologyGeochemistry, Geophysics, Geosystems
researchProduct

Volcanic plume monitoring at mount Etna by diffusive(passive)sampling

2004

This paper reports the use of diffusive tubes in determining HF, HCI, and SO2 in the volcanic plume of Mount Etna in an attempt to highlight the potential of this method in studying volcanoes. In a first application a network of 18 diffusive tubes was installed on Etna's flanks, aimed at evaluating the atmospheric dispersion of the volcanic plume on a local scale. Results showed a monotonic decrease in volatile air concentrations with distance from the craters (HF from 0.15 to <0.003 μmol m-3 , HCl from 2 to <0.01 μmol m -3, and SO2 from 11 to 0.04 μmol m -3 ), revealing the prevalently volcanic contribution. Matching of SO2/HCl and HCl/HF volatile ratios with contemporaneous measurements a…

Etna Volcanovolcanic plumes impact of volcanic emissions sulfur and halogens chemistry
researchProduct