Brent Topping
Brent is the Quality Management System (QMS) Manager for the NW-PI Region. He, and the USGS QMS Team, lead USGS laboratories through implementation of a new Bureau-wide QMS. Brent works closely with Southwest Region laboratories and their staff on the implementation of 10 Core Elements, including documentation, procedures, methods, quality controls, sample management and quality assessment
Science and Products
Filter Total Items: 25
Stable metal isotopes reveal copper accumulation and loss dynamics in the freshwater bivalve Corbucula Stable metal isotopes reveal copper accumulation and loss dynamics in the freshwater bivalve Corbucula
Characterization of uptake and loss dynamics is critical to understanding risks associated with contaminant exposure in aquatic animals. Dynamics are especially important in addressing questions such as why coexisting species in nature accumulate different levels of a contaminant. Here we manipulated copper (Cu) stable isotopic ratios (as an alternative to radioisotopes) to describe for...
Authors
M.-N. Croteau, S. N. Luoma, B.R. Topping, C.B. Lopez
Dissolved nickel and benthic flux in South San Francisco Bay: A potential for natural sources to dominate Dissolved nickel and benthic flux in South San Francisco Bay: A potential for natural sources to dominate
No abstract available.
Authors
B.R. Topping, J.S. Kuwabara
Importance of Sediment-Water Interactions in Coeur d'Alene Lake, Idaho, USA: Management Implications Importance of Sediment-Water Interactions in Coeur d'Alene Lake, Idaho, USA: Management Implications
A field study at Coeur d'Alene Lake, Idaho, USA, was conducted between October 1998 and August 2001 to examine the potential importance of sediment-water interactions on contaminant transport and to provide the first direct measurements of the benthic flux of dissolved solutes of environmental concern in this lake. Because of potential ecological effects, dissolved zinc and...
Authors
J.S. Kuwabara, J.L. Carter, B.R. Topping, S.V. Fend, P. F. Woods, W.M. Berelson, Laurie S. Balistrieri
Sediment-water interactions affecting dissolved-mercury distributions in Camp Far West Reservoir, California Sediment-water interactions affecting dissolved-mercury distributions in Camp Far West Reservoir, California
No abstract available.
Authors
James S. Kuwabara, Charles N. Alpers, Mark Marvin-DiPasquale, Brent R. Topping, James L. Carter, A. Robin Stewart, Steven V. Fend, Francis Parcheso, Gerald E. Moon, David P. Krabbenhoft
Flux of dissolved forms of mercury across the sediment-water interface in Lahontan Reservoir, Nevada Flux of dissolved forms of mercury across the sediment-water interface in Lahontan Reservoir, Nevada
No abstract available.
Authors
James S. Kuwabara, Mark Marvin-DiPasquale, Wayne Praskins, Earl Byron, Brent R. Topping, James L. Carter, Steven V. Fend, Francis Parcheso, David P. Krabbenhoft, Mae S. Gustin
Benthic flux of dissolved nickel into the water column of south San Francisco Bay Benthic flux of dissolved nickel into the water column of south San Francisco Bay
Field and laboratory studies were conducted between April, 1998 and May, 1999 to provide the first direct measurements of the benthic flux of dissolved (0.2-micron filtered) nickel between the bottom sediment and water column at three sites in the southern component of San Francisco Bay (South Bay), California. Dissolved nickel and predominant ligands (represented by dissolved organic...
Authors
B.R. Topping, J.S. Kuwabara, Francis Parcheso, S.W. Hager, A.J. Arnsberg, Fred Murphy
Science and Products
Filter Total Items: 25
Stable metal isotopes reveal copper accumulation and loss dynamics in the freshwater bivalve Corbucula Stable metal isotopes reveal copper accumulation and loss dynamics in the freshwater bivalve Corbucula
Characterization of uptake and loss dynamics is critical to understanding risks associated with contaminant exposure in aquatic animals. Dynamics are especially important in addressing questions such as why coexisting species in nature accumulate different levels of a contaminant. Here we manipulated copper (Cu) stable isotopic ratios (as an alternative to radioisotopes) to describe for...
Authors
M.-N. Croteau, S. N. Luoma, B.R. Topping, C.B. Lopez
Dissolved nickel and benthic flux in South San Francisco Bay: A potential for natural sources to dominate Dissolved nickel and benthic flux in South San Francisco Bay: A potential for natural sources to dominate
No abstract available.
Authors
B.R. Topping, J.S. Kuwabara
Importance of Sediment-Water Interactions in Coeur d'Alene Lake, Idaho, USA: Management Implications Importance of Sediment-Water Interactions in Coeur d'Alene Lake, Idaho, USA: Management Implications
A field study at Coeur d'Alene Lake, Idaho, USA, was conducted between October 1998 and August 2001 to examine the potential importance of sediment-water interactions on contaminant transport and to provide the first direct measurements of the benthic flux of dissolved solutes of environmental concern in this lake. Because of potential ecological effects, dissolved zinc and...
Authors
J.S. Kuwabara, J.L. Carter, B.R. Topping, S.V. Fend, P. F. Woods, W.M. Berelson, Laurie S. Balistrieri
Sediment-water interactions affecting dissolved-mercury distributions in Camp Far West Reservoir, California Sediment-water interactions affecting dissolved-mercury distributions in Camp Far West Reservoir, California
No abstract available.
Authors
James S. Kuwabara, Charles N. Alpers, Mark Marvin-DiPasquale, Brent R. Topping, James L. Carter, A. Robin Stewart, Steven V. Fend, Francis Parcheso, Gerald E. Moon, David P. Krabbenhoft
Flux of dissolved forms of mercury across the sediment-water interface in Lahontan Reservoir, Nevada Flux of dissolved forms of mercury across the sediment-water interface in Lahontan Reservoir, Nevada
No abstract available.
Authors
James S. Kuwabara, Mark Marvin-DiPasquale, Wayne Praskins, Earl Byron, Brent R. Topping, James L. Carter, Steven V. Fend, Francis Parcheso, David P. Krabbenhoft, Mae S. Gustin
Benthic flux of dissolved nickel into the water column of south San Francisco Bay Benthic flux of dissolved nickel into the water column of south San Francisco Bay
Field and laboratory studies were conducted between April, 1998 and May, 1999 to provide the first direct measurements of the benthic flux of dissolved (0.2-micron filtered) nickel between the bottom sediment and water column at three sites in the southern component of San Francisco Bay (South Bay), California. Dissolved nickel and predominant ligands (represented by dissolved organic...
Authors
B.R. Topping, J.S. Kuwabara, Francis Parcheso, S.W. Hager, A.J. Arnsberg, Fred Murphy