Lina Hällström

LinaQuantifying the impact of volcanic as particulates on the environment

I finished my Master’s studies in the spring of 2014 at the Technical University of Lulea (Sweden) with a diploma entitled Natural Resources Enginnering MSc. The main focus of my studies were geochemistry in natural and anthropogenic processes, ecotoxicology and soil remediation. On the 1st of May 2015 I was appointed as a MetTrans Early Stage Researcher by the Division of Earth Science at Durham University. During 9 months I will assess the possibility to use radiogenic (87Sr/86Sr) and stable (88Sr/86Sr) strontium isotopes as tracers of volcanic ash deposited in fresh water. Ash and water samples from the 2010 eruption of Eyjafjallajökull (Iceland) will be utilized. Former research have found that the classification of the ash is trachyandesite with crystallization of plagioclase, pyroxene and olivine. Strontium is a litophile element that bind to silicate minerals through ionization and can substitute for Calcium in plagioclase due to their same size and geochemistry.

Research have also shown that the volatiles of SO4-2, CL and F can form thin coatings on the surfaces of volcanic ash. The bindings rapidly dissolve when the ash is deposited in fresh water and this can have adverse effects on ecosystems and water quality. Measurements and evaluations of these processes will be incorporated in my project as well.