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. D. Smith and Robert A. Zielinski and Howard E. Taylor and M. 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… 
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