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Dispersion of arsenic species from highly explosive historical volcanic eruptions in Patagonia by Gonzalo Bia; M. Gabriela García; Nicolás J. Cosentino; Laura Borgnino is a Environmental Science article available to read on EtoBox.

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Andean volcanic rocks typically have low to moderate arsenic (As) concentrations. However, elevated levels of As in groundwaters of southern South America have been reported as a consequence of weathering of volcanic glass. This study discusses the abundance, speciation and dispersion of As species in fresh volcanic ash from highly explosive (Volcanic Explosivity Index: 4-5) Patagonian eruptions, as well as the potential of As release to aqueous reservoirs. Synchrotron-based X-ray absorption and micro-focused X-ray photoelectron spectroscopies were used to evaluate As solid speciation. Batch experiments at different pH conditions were performed with the aim of understanding the controls on As release to aqueous reservoirs. Bulk chemical and mineralogical characterizations were performed by inductively coupled plasma optical emission spectroscopy, X-ray diffraction and scanning electron microscopy/energy dispersive spectroscopy. Finally, to understand how As-bearing phases are spatially distributed after eruptions, simulations of volcanic ash emission, transport and deposition were performed. Results indicate that the concentration, speciation, and mobility of As in fresh Patagonian

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Author

Gonzalo Bia; M. Gabriela García; Nicolás J. Cosentino; Laura Borgnino

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Environmental Science (Physical Sciences)