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Chemical analysis
Chemical techniques used to identify the composition of substances.
Subtopics:
Atomic absorption analysis (3 items)
Chromatography (3 items)
DNA sequencing (10 items)
Electrophoresis (3 items)
Mass spectroscopy (7 items)
Neutron activation analysis (2 items)
Particle-beam spectroscopy (1 items)
Polymerase chain reaction (4 items)
X-ray diffraction (1 items)
Atomic emission spectroscopy (4 items)

Sediment geochemistry (4 items)
Related topics:
Results 41 - 50 of 60 listed by similarity [list alphabetically]
National Stream Quality Accounting Network (NASQAN) [More info]
Homepage for description of the National Stream Quality Network (NASQAN), a long-term program monitoring the concentrations and flux of sediment and chemicals in the Nation's largest rivers (Mississippi, Columbia, Colorado, Rio Grande, and Yukon).
Northern Divide Grizzly Bear Project [More info]
Project to assess the grizzly bear population size, trend, and survival in the Northern Continental Divide Ecosystem (NCDE) in Montana to improve the long-term survival for this threatened species. With description, DNA identification means and photos.
NPElement: A database of lichen elemental concentrations in the U.S. national parks [More info]
Database providing concentration of heavy metals, nutrients, and trace elements in 75 species of lichens sampled in 43 national park units in 24 states.
Nutrients in the Nation's streams and groundwater: National findings and implications [More info]
Despite public sector efforts to reduce nonpoint-source nutrients in streams and rivers, concentrations have remained the same or increased, continuing to pose risks to aquatic life and human health.
PDF Occurrence of Emerging Contaminants in Water and Bed Material in the Missouri River, North Dakota, 2007 [More info]
Water monitoring results, focused on wastewater compounds, human-health pharmaceutical compounds, hormones, and antibiotics in water, and waste indicators, hormones, and antibiotics in solids.
Occurrence of selected radionuclides in ground water used for drinking water in the United States [More info]
Results (*.pdf) of a 1998 targeted reconnaissance survey on the sources of radium, polonium, and lead radionuclides, data collection and laboratory methods, existing occurrences in drinking water, risk assessments, and compliance monitoring.
PDF Organic Compounds in Clackamas River Water Used for Public Supply near Portland, Oregon, 2003-05 [More info]
In all, 56 compounds were detected in samples collected approximately monthly during 2003-05 at the intake for the Clackamas River Water plant. On the basis of this screening-level assessment, adverse effects to human health are assumed to be negligible.
PDF Organic compounds in Elm Fork Trinity river water used for public supply near Carrollton, Texas, 2002-05 [More info]
We identified six compounds at concentrations less than human-health benchmarks, but within a factor of 10 of those limits. Those compounds might warrant further study to understand their transport and fate within the watershed.
Organic compounds in Truckee River water used for public supply near Reno, Nevada, 2002-05 [More info]
A preliminary indication of the potential importance of compounds detected in source water to the quality of finished water prior to distribution.
PDF Organic compounds in White River water used for public supply near Indianapolis, Indiana, 2002-05 [More info]
Measured concentrations of many compounds in water people use. Some compounds are regulated as health hazards; a few of these were over the benchmark limits. Others may become issues of concern, so studies such as this give us helpful background levels.
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