Leaching characteristics of ash from the May 18, 1980, eruption of Mount St. Helens volcano, Washington

  title={Leaching characteristics of ash from the May 18, 1980, eruption of Mount St. Helens volcano, Washington},
  author={David B. Smith and Robert A. Zielinski and Howard E. Taylor and Michael B. Sawyer},
  journal={Bulletin Volcanologique},
Leaching of freshly erupted air-fall ash, unaffected by rain, from the May 18, 1980, eruption of Mount St. Helens volcano, Washington, shows that Ca2+, Na+, Mg2+, SO42−, and Cl− are the predominant chemical species released on first exposure of the ash to water. Extremely high correlation of Ca with SO4 and Na with Cl in water leachates suggests the presence of CaSO4 and NaCl salts on the ash. The amount of water soluble material on ash increases with distance from source and with the weight… 
Leachate analyses of volcanic ashes from Stromboli volcano: A proxy for the volcanic gas plume composition?
[1] Many volcanoes show a change in chemical composition of the gas phase prior to periods of eruptive activity. Fine-grained tephra erupted from active vents and transported through volcanic plumes
Trace analysis and leaching dynamics of volcanic ash using NAA and ICP-MS
In 2010, Mt Merapi in Indonesia erupted releasing approximately 160 million tonnes of ash, roughly 75 % of which fell on or near Indonesia. With this extreme amount of a substance, even tract
Environmental geochemistry of recent volcanic ashes from the Southern Andes
Environmental context Explosive volcanic eruptions may have significant environmental repercussions for many Earth system cycles, particularly the water cycle. We investigate the potential
Volcanic ash-leachates: a review and recommendations for sampling methods


Soluble Material on Ash from Active Central American Volcanoes
Eruptions of six active volcanoes in Central America provided 57 volcanic ash samples in the past 7 yrs which were unaffected by rain. The ash samples were leached with water which was analyzed for
Chemical composition of Mount St. Helens volcanic ash
Volcanic ash samples from the May 18, 1980, Mount St. Helens eruption were analyzed for major, minor, and trace composition by a variety of analytical techniques. Results indicate that the basic
Scavenging of volcanic aerosol by ash: Atmospheric and volcanologic implications
  • W. Rose
  • Geology, Environmental Science
  • 1977
The initial concentrations of S (1,600 ppm) and Cl (1,100 ppm) in the high-Al2O3 basaltic magma from the 1974 eruptions of Fuego Volcano, Guatemala, were inferred from trapped glass inclusions in
Mount St. Helens Ash from the 18 May 1980 Eruption: Chemical, Physical, Mineralogical, and Biological Properties
In vitro biological tests showed the ash from the 18 May 1980 eruption of Mount St. Helens to be nontoxic to alveolar macrophages, which are an important part of the lungs' natural clearance mechanism.
Reactions of Feldspar and Mica with Water at Low Temperature and Pressure1
Muscovite and K-feldspar (adularia) were dry-ground to — 200/inch particles, which were suspended in water. These suspensions were “titrated” with KCl, and the pH was recorded as a function of KCl
Uranium in secondary silica; a possible exploration guide
Study of uraniferous silica precipitates in the Shirley Basin, Wyoming, identified areas where ancient uraniferous ground water once ponded. Chalcedony collected from and directly beneath thick
Studies of volcanic ash from two recent Central American eruptions
The 1971 eruptions of Cerro Negro volcano in Nicaragua and Fuego volcano in Guatemala produced ash blankets with minimum volumes of 7 × 107 m3 and 6 × 107 m3, respectively. Seven new chemical