USGS: Science Topics: geochemistry

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Geochemistry

Study of the distribution of chemical elements and natural compounds on the earth and in the atmosphere and the chemical processes that affect the earth.

Subtopics:
Soil chemistry (4 items)
Water chemistry (120 items)

Geochemical anomaly maps (9 items)

Related topics:

Results 101 - 110 of 175 listed by similarity [list alphabetically]

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.
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.
Occurrence, distribution, and concentrations of selected contaminants in streambed- and suspended-sediment samples collected in Bexar County, Texas, 2007-09 [More info]: Study showing which chemicals found in sediments were most common, with methods used and likely consequences of their high concentrations.
Office of Water Quality, Branch of Quality Systems [More info]: Branch of Quality Systems monitors the consistent collection and reporting of water-quality data with documentation of field and laboratory methods and proficiency testing. Links to standard reference samples and quality assurance standards.
Online guide to the continental Cretaceous-Tertiary boundary in the Raton basin, Colorado and New Mexico [More info]: Field guide describing the geology and paleontology of the continental Cretaceous-Tertiary boundary in the Raton basin, Colorado and New Mexico.
Organic compounds assessed in Neuse River water used for public supply near Smithfield, North Carolina, 2002-2005 [More info]: Reports concentration of organic compounds here, to serve as a baseline against which future measurements can be compared and to provide a general assessment of the quality of local water treatment efforts.
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.
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 Running Gutter Brook water used for public supply near Hatfield, Massachusetts, 2003-05 [More info]: The 258 organic compounds in this assessment are man-made: pesticides, solvents, gasoline hydrocarbons, personal-care and domestic-use products, pavement and combustion-derived compounds. None were found in concentrations deemed dangerous at this time.

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