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Speciation of volatile arsenic at geothermal features in Yellowstone National Park |
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| Authors: | Britta Planer-Friedrich Corinne Lehr Jörg Matschullat Darrell Kirk Nordstrom |
| Institution: | a Technische Universität Bergakademie Freiberg, Department of Geology, 09599 Freiberg, Germany b Montana State University, Thermal Biology Institute Bozeman, MT 59717, USA c California Polytechnic State University, Department of Chemistry and Biochemistry, San Luis Obispo, CA 93407, USA d Technische Universität Bergakademie Freiberg, Department of Mineralogy, 09599 Freiberg, Germany e US Geological Survey, 3215 Marine St, Boulder, CO 80303, USA f US Geological Survey, National Water Quality Laboratory, Denver, CO 80225-004, USA |
| Abstract: | Geothermal features in the Yellowstone National Park contain up to several milligram per liter of aqueous arsenic. Part of this arsenic is volatilized and released into the atmosphere. Total volatile arsenic concentrations of 0.5-200 mg/m3 at the surface of the hot springs were found to exceed the previously assumed nanogram per cubic meter range of background concentrations by orders of magnitude. Speciation of the volatile arsenic was performed using solid-phase micro-extraction fibers with analysis by GC-MS. The arsenic species most frequently identified in the samples is (CH3)2AsCl, followed by (CH3)3As, (CH3)2AsSCH3, and CH3AsCl2 in decreasing order of frequency. This report contains the first documented occurrence of chloro- and thioarsines in a natural environment. Toxicity, mobility, and degradation products are unknown. |
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