Water Chemistry Data for Selected Springs, Geysers, and Streams in Yellowstone National Park, Wyoming, Beginning 2009

Water analyses are reported for 371 water samples collected from numerous thermal and non-thermal features in Yellowstone National Park (YNP) during 2009?2013. Water samples were collected and analyzed for major and trace constituents from 19 thermal areas of YNP including the Amphitheater Springs area, Nymph Lake area, West Nymph Creek Thermal Area, Norris Geyser Basin, Chocolate Pots, Gibbon Geyser Basin (including Geyser Springs Group, Sylvan Spring area, and Monument Geyser Basin), Secret Valley Hot Springs, Lower Geyser Basin, Upper Geyser Basin, Lone Star Geyser area, Forest Springs area, Crater Hills area, Mud Volcano area, and Snake Hot Springs area. These water samples were collected and analyzed as part of research investigations in YNP on arsenic, iron, nitrogen, and sulfur redox species in hot springs and overflow drainages; the occurrence and distribution of dissolved mercury; and general hydrogeochemistry of hot springs. \r\nWater samples were filtered and preserved on site. Water temperature, pH, electrical conductivity, EMF (electromotive force or electrical potential), and concentrations of dissolved oxygen were measured on site at the time of sampling. Dissolved concentrations of sulfur redox species (hydrogen sulfide, thiosulfate, and polythionate) were determined on site in a mobile laboratory. Dissolved concentrations of major cations (calcium, magnesium, sodium, and potassium), anions (chloride, sulfate, alkalinity, fluoride, and bromide), nutrients (nitrate, ammonium, and phosphorus), silica, trace metals (aluminum, antimony, barium, beryllium, bismuth, boron, cadmium, cerium, cesium, chromium, cobalt, copper, dysprosium, erbium, europium, gadolinium, holmium, lanthanum, lead, lithium, lutetium, manganese, mercury, molybdenum, neodymium, nickel, praseodymium, rhenium, rubidium, samarium, selenium, strontium, tellurium, terbium, thallium, thorium, thulium, tin, tungsten, uranium, vanadium, ytterbium, yttrium, zinc, and zirconium), arsenic and iron redox species (arsenite, total dissolved arsenic, ferrous and total dissolved iron), acidity, dissolved organic carbon, and hydrogen and oxygen isotope ratios were determined in a U.S. Geological Survey laboratory.