Oxyanion Concentrations in Eastern Sierra Nevada Rivers – 3. Boron, Molybdenum, Vanadium, and Tungsten

摘要: Water samples were collected from 10 locations along the Truckee River system, 14 Walker and 12 Carson River, analyzed for B, Mo, V, W, Na, Cl, pH. Boron concentrations ranged approximately 2 μmol/kg in upper reaches of to almost 1,200 Pyramid Lake. Molybdenum, W had nanomolal range; Mo varied a low about nmol/kg high 3,200 (Walker Lake); V 9 470 nmol/kg; value around 0.8 (West River) 1,030 nmol/kg. The these oxyanion-forming trace elements rivers reflects (1) relative stability oxyanions (e.g., MoO4 2-, HVO4 2-, WO4 2-, B(OH)3, and/or B(OH)4 -) alkaline, well oxygenated river lake waters, (2) contributions hydrothermal waters (especially B), (3) weathering rocks/regolith with elements. In case each exhibited relatively conservative behavior upper, all three rivers. During study period region experienced prolonged drought such that lower typified by no flow or stagnant probably oxygen anoxic conditions (although not measured). Reductive processes occurring could have led removal solution as coprecipitates Fe monosulfides, via sorption oxides/oxyhydroxides organic matter. Boron, however, essentially minor rivers, instead was added B-rich Steamboat Creek Hot Springs), groundwaters base-flow during extensive drought.