Water-Chemistry Data for Selected Hot Springs, Geysers, and Streams in Yellowstone National Park, Wyoming, 2001-2002

Water analyses are reported for one-hundred-twenty-one samples collected from
hot springs and their overflow drainages, the Gibbon River, and one
ambient-temperature acid stream in Yellowstone National Park (YNP) during
2001-2002. Twenty-five analyses are reported for samples collected during May
2001, fifty analyses are reported for samples collected during September 2001,
eleven analyses are reported for samples collected during October 2001, and
thirty-five analyses are reported for samples collected during June and July
2002. Water samples were collected and analyzed for major and trace
constituents from nine areas of YNP including Norris Geyser Basin, Nymph Lake
and Roadside Springs, Lower Geyser Basin, Washburn Springs, Calcite Springs,
Crater Hills, Mammoth Hot Springs, West Thumb Geyser Basin, and Brimstone
Basin. These water samples were collected and analyzed as part of research
investigations in YNP on arsenic redox distribution in hot springs and overflow
drainages, the occurrence and distribution of dissolved mercury, and sulfur
redox speciation. Most samples were analyzed for major cations and anions,
trace metals, and iron, arsenic, nitrogen, and sulfur redox species. Only
mercury concentration, pH, and specific conductance were determined for samples
collected in October 2001 as they were collected during a reconnaissance field
trip. Analyses were performed at the sampling site, in an onsite mobile
laboratory, or later in a U.S. Geological Survey laboratory, depending on
stability of the constituent and whether it could be preserved effectively.

[Summary provided by the USGS.]