LaDonna Choate
LaDonna Choate is a Staff Scientist in the Office of Science Quality and Integrity.
Science and Products
Filter Total Items: 14
Net Acid Production, Acid Neutralizing Capacity, and Associated Mineralogical and Geochemical Characteristics of Animas River Watershed Igneous Rocks Near Silverton, Colorado Net Acid Production, Acid Neutralizing Capacity, and Associated Mineralogical and Geochemical Characteristics of Animas River Watershed Igneous Rocks Near Silverton, Colorado
This report presents results from laboratory and field studies involving the net acid production (NAP), acid neutralizing capacity (ANC), and magnetic mineralogy of 27 samples collected in altered volcanic terrain in the upper Animas River watershed near Silverton, Colo., during the summer of 2005. Sampling focused mainly on the volumetrically important, Tertiary-age volcanic and...
Authors
Douglas B. Yager, LaDonna Choate, Mark R. Stanton
Determination of premining geochemical background and delineation of extent of sediment contamination in Blue Creek downstream from Midnite Mine, Stevens County, Washington Determination of premining geochemical background and delineation of extent of sediment contamination in Blue Creek downstream from Midnite Mine, Stevens County, Washington
Geochemical and radionuclide studies of sediment recovered from eight core sites in the Blue Creek flood plain and Blue Creek delta downstream in Lake Roosevelt provided a stratigraphic geochemical record of the contamination from uranium mining at the Midnite Mine. Sediment recovered from cores in a wetland immediately downstream from the mine site as well as from sediment catchments in...
Authors
Stan E. Church, Frederick E. Kirschner, LaDonna M. Choate, Paul J. Lamothe, James R. Budahn, Zoe Ann Brown
Geochemical data from analyses of rock, sediment, water, and solid-phase leaching at the Tuba City Open Dump, Tuba City, Arizona Geochemical data from analyses of rock, sediment, water, and solid-phase leaching at the Tuba City Open Dump, Tuba City, Arizona
This report releases data collected by the U.S. Geological Survey from the Tuba City Open Dump area from January 2008 to September 2008 with cooperation from the U.S. Bureau of Indian Affairs and the Navajo and Hopi Tribes. These data were collected in support of investigations into the possible sources and resulting transport of radionuclides and other dissolved constituents in the...
Authors
Raymond H. Johnson, James K. Otton, Robert Horton, Tanya J. Gallegos, LaDonna M. Choate, Jonah E. Sullivan
Predicting toxic effects of copper on aquatic biota in mineralized areas by using the Biotic Ligand Model Predicting toxic effects of copper on aquatic biota in mineralized areas by using the Biotic Ligand Model
The chemical speciation of metals influences their biological effects. The Biotic Ligand Model (BLM) is a computational approach to predict chemical speciation and acute toxicological effects of metals on aquatic biota. Recently, the U.S. Environmental Protection Agency incorporated the BLM into their regulatory water-quality criteria for copper. Results from three different laboratory...
Authors
Kathleen S. Smith, James F. Ranville, M. Adams, LaDonna M. Choate, Stan E. Church, David L. Fey, Richard B. Wanty, James G. Crock
Integrating bioavailability approaches into waste rock evaluations Integrating bioavailability approaches into waste rock evaluations
The presence of toxic metals in soils affected by mining, industry, agriculture and urbanization, presents problems to human health, the establishment and maintenance of plant and animal habitats, and the rehabilitation of affected areas. A key to managing these problems is predicting the fraction of metal in a given soil that will be biologically labile, and potentially harmful (...
Authors
James F. Ranville, E. P. Blumenstein, M. J. Adams, LaDonna M. Choate, Kathleen S. Smith, Thomas R. Wildeman
Geochemical assessment of metals and dioxin in sediment from the San Carlos Reservoir and the Gila, San Carlos, and San Francisco Rivers, Arizona Geochemical assessment of metals and dioxin in sediment from the San Carlos Reservoir and the Gila, San Carlos, and San Francisco Rivers, Arizona
In October 2004, we sampled stream-bed sediment, terrace sediment, and sediment from the San Carlos Reservoir to determine the spatial and chronological variation of six potentially toxic metals-Cu, Pb, Zn, Cd, As, and Hg. Water levels in the San Carlos Reservoir were at a 20-year low at an elevation of 2,409 ft (734.3 m). Four cores were taken from the reservoir: one from the San Carlos...
Authors
Stan E. Church, LaDonna M. Choate, Marci E. Marot, David L. Fey, Monique Adams, Paul H. Briggs, Zoe Ann Brown
Science and Products
Filter Total Items: 14
Net Acid Production, Acid Neutralizing Capacity, and Associated Mineralogical and Geochemical Characteristics of Animas River Watershed Igneous Rocks Near Silverton, Colorado Net Acid Production, Acid Neutralizing Capacity, and Associated Mineralogical and Geochemical Characteristics of Animas River Watershed Igneous Rocks Near Silverton, Colorado
This report presents results from laboratory and field studies involving the net acid production (NAP), acid neutralizing capacity (ANC), and magnetic mineralogy of 27 samples collected in altered volcanic terrain in the upper Animas River watershed near Silverton, Colo., during the summer of 2005. Sampling focused mainly on the volumetrically important, Tertiary-age volcanic and...
Authors
Douglas B. Yager, LaDonna Choate, Mark R. Stanton
Determination of premining geochemical background and delineation of extent of sediment contamination in Blue Creek downstream from Midnite Mine, Stevens County, Washington Determination of premining geochemical background and delineation of extent of sediment contamination in Blue Creek downstream from Midnite Mine, Stevens County, Washington
Geochemical and radionuclide studies of sediment recovered from eight core sites in the Blue Creek flood plain and Blue Creek delta downstream in Lake Roosevelt provided a stratigraphic geochemical record of the contamination from uranium mining at the Midnite Mine. Sediment recovered from cores in a wetland immediately downstream from the mine site as well as from sediment catchments in...
Authors
Stan E. Church, Frederick E. Kirschner, LaDonna M. Choate, Paul J. Lamothe, James R. Budahn, Zoe Ann Brown
Geochemical data from analyses of rock, sediment, water, and solid-phase leaching at the Tuba City Open Dump, Tuba City, Arizona Geochemical data from analyses of rock, sediment, water, and solid-phase leaching at the Tuba City Open Dump, Tuba City, Arizona
This report releases data collected by the U.S. Geological Survey from the Tuba City Open Dump area from January 2008 to September 2008 with cooperation from the U.S. Bureau of Indian Affairs and the Navajo and Hopi Tribes. These data were collected in support of investigations into the possible sources and resulting transport of radionuclides and other dissolved constituents in the...
Authors
Raymond H. Johnson, James K. Otton, Robert Horton, Tanya J. Gallegos, LaDonna M. Choate, Jonah E. Sullivan
Predicting toxic effects of copper on aquatic biota in mineralized areas by using the Biotic Ligand Model Predicting toxic effects of copper on aquatic biota in mineralized areas by using the Biotic Ligand Model
The chemical speciation of metals influences their biological effects. The Biotic Ligand Model (BLM) is a computational approach to predict chemical speciation and acute toxicological effects of metals on aquatic biota. Recently, the U.S. Environmental Protection Agency incorporated the BLM into their regulatory water-quality criteria for copper. Results from three different laboratory...
Authors
Kathleen S. Smith, James F. Ranville, M. Adams, LaDonna M. Choate, Stan E. Church, David L. Fey, Richard B. Wanty, James G. Crock
Integrating bioavailability approaches into waste rock evaluations Integrating bioavailability approaches into waste rock evaluations
The presence of toxic metals in soils affected by mining, industry, agriculture and urbanization, presents problems to human health, the establishment and maintenance of plant and animal habitats, and the rehabilitation of affected areas. A key to managing these problems is predicting the fraction of metal in a given soil that will be biologically labile, and potentially harmful (...
Authors
James F. Ranville, E. P. Blumenstein, M. J. Adams, LaDonna M. Choate, Kathleen S. Smith, Thomas R. Wildeman
Geochemical assessment of metals and dioxin in sediment from the San Carlos Reservoir and the Gila, San Carlos, and San Francisco Rivers, Arizona Geochemical assessment of metals and dioxin in sediment from the San Carlos Reservoir and the Gila, San Carlos, and San Francisco Rivers, Arizona
In October 2004, we sampled stream-bed sediment, terrace sediment, and sediment from the San Carlos Reservoir to determine the spatial and chronological variation of six potentially toxic metals-Cu, Pb, Zn, Cd, As, and Hg. Water levels in the San Carlos Reservoir were at a 20-year low at an elevation of 2,409 ft (734.3 m). Four cores were taken from the reservoir: one from the San Carlos...
Authors
Stan E. Church, LaDonna M. Choate, Marci E. Marot, David L. Fey, Monique Adams, Paul H. Briggs, Zoe Ann Brown