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High temperature SO2 chemisorption on model systems. Implications for in-plume processes.

By Paul Martin Ayris

Abstract

Volcanic volatile species are scavenged by silicate ash during transition through eruption plumes. Scavenging may form S, F and Cl salts and acids on ash surfaces, though the mechanisms and controlling variables remain poorly understood. A limited mechanistic understanding impedes estimation of volcanic volatile budgets and may also prevent assessment of environmental impacts resulting from volatile scavenging. Limited assessment of these impacts may have implications for local communities affected by ashfall onto vegetation, soils and into water bodies, and ashfall from very large eruptions may have global impacts. Through experimental techniques, this study examined SO2 scavenging mechanisms on silicate ash surfaces. SO2 uptake experiments were conducted on model Ca-aluminosilicate xerogels and on glasses with chemical compositions of common ash types. The materials were characterised using bulk and surface-sensitive techniques to gain insight into the mechanisms of scavenging and the reaction products formed. SO2 chemisorption onto glass surfaces may occur on non-bridging oxygens of network modifying cations (Ca), forming sulphate salts (CaSO4) and initiates diffusion mechanisms which resupplies the surface with Ca. The chemisorption-diffusion mechanism may be most efficient at high temperature, and may become significant after a few minutes of SO2 exposure. The proposed scavenging mechanism may occur during the eruption within the high temperature volcanic conduit and in the core of the plume. High temperature SO2 scavenging could deposit the soluble S salts inferred to exist on ash and may dictate its surface chemistry for later reactions during transport through the plume and dispersion in the atmosphere and/or environment. It is not yet possible to quantify this mechanism or compare it to other scavenging mechanisms (aqueous acid condensation, high temperature salt condensation), and so future studies should attempt to constrain all volatile scavenging mechanisms occurring on ash surfaces, with particular focus on high temperatures, even in the subterranean environment

Publisher: Environment (York)
Year: 2010
OAI identifier: oai:etheses.whiterose.ac.uk:1058

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  1. (1988). 4. Basic wind processes. Agriculture, Ecosystems and Environment 22-23:91-101 Lynch JM, Elliot LF doi
  2. (1994). Acid-loading from Icelandic Tephra falling on acidified ecosystems as a key to understanding archaeological and environmental stress in Northern and doi
  3. (1995). Acidification, nitrogen deposition and rapid vegetational change in a small valley mire in Yorkshire. Biological Conservation 71(2):143-153 doi
  4. (2001). Adsorption on silica surfaces. doi
  5. Agronomic impact of tephra fallout from the 1995 and doi
  6. (2003). Atmospheric impact of the 1983-1984 Laki Eruption: Part II. Climatic effect of sulphate aerosol. Atmospheric Chemistry and Physics Discussions 3:1599-1629 doi
  7. (2004). Bipolar correlation of volcanism with millennial climate change. doi
  8. (1987). Comparative abilities of leaf surfaces to neutralise acidic raindrops. II. The influence of leaf wettability, leaf age and rain duration on changes in droplet pH and chemistry on leaf surface. doi
  9. (2000). Composition of magmas. In: Sigurdsson
  10. (1986). Condensation of volatile elements in high-temperature gases of Mount St. doi
  11. (1980). Cristaldi A (2010) Developments in analysis of basaltic ash applied to recent activity at Stromboli and Etna volcanoes. Geophysical Research Abstracts 12:EGU2010-15296 Le Guern
  12. (2004). Effects of tephra deposition on mire vegetation: a field experiment in Hokkaido, doi
  13. (1984). Electron Spectroscopy and Related Phenomena 21:265-273 Varekamp JC, Luhr JF, Prestegaard KL
  14. (1997). Environmental assessment of 1991 Hudson volcano eruption ashfall effects on southern Patagonia region, Argentina. Environmental Geology 25:119-125 Jackson RB, Caldwell MM doi
  15. (1980). Environmental Monitoring 5(6):984-988 Stuart Chapin F
  16. (2008). Excess degassing from volcanoes and its role on eruptive and intrusive activity. Reviews of Geophysics 46:doi:10.1029/2007RG000244 Shipley S, Sarna-Wojciki AM doi
  17. (1983). Foliage damage in coniferous trees following volcanic ashfall from Mt. doi
  18. (1998). Geochemistry of ash leachates during the 1994-1996 activity of Popocat├ępetl volcano. Applied Geochemistry 13(7):841-850 Atkins P doi
  19. (1988). Geological Society of America Bulletin 97(7):896-905 Collins BD, Dunne T doi
  20. (1982). Glass surfaces. In: Tomozawa M, Doremus RH (eds) Treatise on Materials Science and Technology.
  21. (1980). Halving of the Northern wetland CH4 source by a large Icelandic volcanic eruption. doi
  22. (1982). Helens ash: considerations on its fallout on rangelands. In: Special Report no. 650. Oregon State University Agricultural Station,
  23. (2000). Helens One Year After the Major Eruption. Science 216(4543):292-293 Sigurdsson H doi
  24. (1986). Helens' volcanic ash on plant growth and mineral uptake. doi
  25. (1987). How plants survive burial: a review and initial responses to tephra from Mount St. Helens. In: Bilderback DE (ed) Mount St. Helens 1980: Botanical consequences of the explosive eruptions.
  26. (1982). In: College of Tropical Agriculture and Human Resources, Univ. of Hawaii Research Extension Series 024. Honolulu, p 172
  27. (1982). In: Thirty Ninth Annual Meeting, American Chemical Society.
  28. (1996). Influence of sulfur dioxide adsorption on the surface properties of metal oxides. doi
  29. (1982). Influence of volcanic ash from the May 18, 1980, eruption of Mount St. Helens on the properties of soils. Journal of Soil and Water Conservation 37(3):185-189 Goldman CR
  30. (2005). Kinetic model for the reaction between SO2 and coal fly ash/CaO/CaSO4 sorbent. Journal of Thermal Analysis and Calorimetry 79:691-695 Legod doi
  31. (2005). Marine Ecology. Processes, Systems and Impacts.
  32. (1999). Novel route in the synthesis of MCM-41 containing framework aluminum and its characterization. doi
  33. (1999). Oceanography 11(3):426-429 Lagalante AF
  34. (1979). On the damage caused by volcanic eruptions with special reference to tephra and gases. In: Sheets PD, Grayson DK (eds) Volcanic activity and human ecology. doi
  35. (1976). Quality criteria for water. In: U.S. Environmental Protection Agency,
  36. (1985). Recovery of forest under- stories buried by tephra from Mount St. Helens. Vegetatio 64:103-111. doi
  37. (1972). Retention of 44-88╬╝ simulated fallout particles by grasses. Health Physics 22:261-266 Prencipe doi
  38. (1998). Scanning Electron Microscopy: Physics of Image Formation and Microanalysis. Springer-Verlag, Berlin, p 527 Rigg GB
  39. (1982). Snowpack modification of volcanic tephra effects on forest understory plants near Mount St. Helens. doi
  40. (1998). Structure refinement of a nonstoichiometric pyroxene synthesized under ambient pressure. Physics and Chemistry of Minerals 25:318-322 Oppenheimer C doi
  41. (1996). Surface analysis: x-ray photoelectron spectroscopy and auger electron specstroscopy. Analytical chemistry 68(12):309-332 Ullerstam doi
  42. (2001). Surface Chemistry. doi
  43. (1978). Surface energy of solids. Topics in Current Chemistry doi
  44. (2007). The effect of volcanic eruptions on the chemistry of surface waters: The doi
  45. The Fate, Distribution and Limnological Effects of Volcanic Tephra in the St. Joe and Coeur D'Alene River Deltas of Lake Coeur D'Alene, Idaho. In: Idaho Water and Energy Resources Research Institute Completion Report., Moscow, p 156 Small H
  46. (2000). The sensitivity of a Tanzanian crater lake to catastrophic tephra input and four millenia of climate change. doi
  47. (1981). Toxicity of volcanic-ash leachate to a bluegreen alga. Results of a preliminary bioassay experiment. Environmental Science and Technology 15(3):362-364 Mehler H doi
  48. (1985). Upward movement of underground plant parts into deposits of tephra from Mount St. Helens. doi
  49. (1956). Use of equilibrium calculations in the interpretation of volcanic gas samples.
  50. (2004). Vegetational response to tephra deposition and land-use change in Iceland: a modern analogue and multiple working hypothesis approach to tephropalynology. Polar Record 40(213):113-120 Eggler doi
  51. (1995). Volcanic gases from subaerial volcanoes on Earth. In: Ahrens T (ed) Global Earth Physics. A handbook of physical constants. American Geophysical doi
  52. (2000). Volcanic gases. In: Sigurdsson
  53. (1982). Volcanology and Geothermal Research 179(1-2):107-119 Mass C, Robock A
  54. (1980). Zeitschrqt fur Geomorphologie Suppl. Bd. 46:103-121 REFERENCE LIST Cook GB, Cooper RF

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