High resolution 3D confocal microscope imaging of volcanic ash particles

David Wertheim, Gavin Gillmore, Ian Gill, Nick Petford

Research output: Contribution to journalArticle

Abstract

We present initial results from a novel high resolution confocal microscopy study of the 3D surface structure of volcanic ash particles from two recent explosive basaltic eruptions, Eyjafjallajökull (2010) and Grimsvötn (2011), in Iceland. The majority of particles imaged are less than 100 μm in size and include PM10s, known to be harmful to humans if inhaled. Previous studies have mainly used 2D microscopy to examine volcanic particles. The aim of this study was to test the potential of 3D laser scanning confocal microscopy as a reliable analysis tool for these materials and if so to what degree high resolution surface and volume data could be obtained that would further aid in their classification. First results obtained using an Olympus LEXT scanning confocal microscope with a × 50 and × 100 objective lens are highly encouraging. They reveal a range of discrete particle types characterised by sharp or concave edges consistent with explosive formation and sudden rupture of magma. Initial surface area/volume ratios are given that may prove useful in subsequent modelling of damage to aircraft engines and human tissue where inhalation has occurred.
Original languageEnglish
JournalScience of The Total Environment
Volume590-591
Early online date9 Mar 2017
DOIs
Publication statusPublished - 15 Jul 2017

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volcanic ash
microscopy
explosive
rupture
aid
engine
aircraft
volcanic eruption
surface area
laser
magma
damage
particle
modeling

Keywords

  • Volcanic ash particles
  • microscopy
  • confocal

Cite this

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abstract = "We present initial results from a novel high resolution confocal microscopy study of the 3D surface structure of volcanic ash particles from two recent explosive basaltic eruptions, Eyjafjallaj{\"o}kull (2010) and Grimsv{\"o}tn (2011), in Iceland. The majority of particles imaged are less than 100 μm in size and include PM10s, known to be harmful to humans if inhaled. Previous studies have mainly used 2D microscopy to examine volcanic particles. The aim of this study was to test the potential of 3D laser scanning confocal microscopy as a reliable analysis tool for these materials and if so to what degree high resolution surface and volume data could be obtained that would further aid in their classification. First results obtained using an Olympus LEXT scanning confocal microscope with a × 50 and × 100 objective lens are highly encouraging. They reveal a range of discrete particle types characterised by sharp or concave edges consistent with explosive formation and sudden rupture of magma. Initial surface area/volume ratios are given that may prove useful in subsequent modelling of damage to aircraft engines and human tissue where inhalation has occurred.",
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High resolution 3D confocal microscope imaging of volcanic ash particles. / Wertheim, David; Gillmore, Gavin; Gill, Ian; Petford, Nick.

In: Science of The Total Environment, Vol. 590-591, 15.07.2017.

Research output: Contribution to journalArticle

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