Evangelos Kakouros
Evangelos Kakouros is a Hydrologist for the USGS Water Resources Mission Area.
Science and Products
Filter Total Items: 19
Geochemical Data for Mercury and Other Constituents in Shallow Sediment and Porewater from Clear Lake, Lake County, California Geochemical Data for Mercury and Other Constituents in Shallow Sediment and Porewater from Clear Lake, Lake County, California
Clear Lake, located in Lake County, California, is impacted by mercury contamination associated with the historic Sulfur Bank mercury mine, which is adjacent to the lake’s eastern shore / Oaks Arm region. As part of a larger study designed to better understand the biogeochemical cycling of mercury in Clear Lake, shallow sediment (top 0-2 cm or 0-4 cm) was sampled from the three major...
Geochemical data for selected streams in the Clear Lake basin, Lake County, California Geochemical data for selected streams in the Clear Lake basin, Lake County, California
This dataset includes water-quality data for samples collected at sixteen sites in the Clear Lake Drainage Basin, Lake County, California, between November 2018 and March 2024. Sampling in the reach of the Scotts Creek drainage below the confluence with South Fork Scotts Creek (USGS stations 11448800 and 390236122575901) was done during November 2018 to May 2019 (water year 2019; water...
Water-quality data including mercury and methylmercury at selected sites in the Cache Creek watershed, Yolo County, California Water-quality data including mercury and methylmercury at selected sites in the Cache Creek watershed, Yolo County, California
This dataset includes water-quality and sediment data for 647 environmental samples collected at 53 surface-water sites in Cache Creek (Cache C) watershed, Yolo County, California, between December 2009 and April 2019, and data for 190 associated quality-control samples (replicates and blanks). About 90 percent of the samples were collected at the following six primary sites that were...
Select elements of concern in surface water of three hydrologic basins (Delaware River, Illinois River and Upper Colorado River) — Data screening for the development of spatial and temporal models Select elements of concern in surface water of three hydrologic basins (Delaware River, Illinois River and Upper Colorado River) — Data screening for the development of spatial and temporal models
This data release is focused on the analysis of surface water concentration data associated with 12 elements of concern from three hydrologic basins. Data is analyzed with respect to: a) reporting limits, b) the extent of censored data, c) co-location with USGS real-time sensor data, and d) median concentrations at the catchment spatial scale. The Proxies Project (under the Water Quality...
Selenium in water, sediment, periphyton, benthic invertebrate and fish tissues from the Kootenai River, Idaho and Montana Selenium in water, sediment, periphyton, benthic invertebrate and fish tissues from the Kootenai River, Idaho and Montana
This dataset includes analyses of selenium (Se) in water, sediment, periphyton, and benthic invertebrate and fish tissues from the Kootenai River in Idaho and Montana. The samples were collected as part of a study intended to evaluate selenium distribution and bioaccumulation in the aquatic food webs of the Kootenai River. This dataset includes complete food web sample results from our...
Surface-Water Geochemistry of Mercury and other Constituents in Clear Lake, Lake County, California Surface-Water Geochemistry of Mercury and other Constituents in Clear Lake, Lake County, California
Clear Lake is a 180 km2 freshwater lake located approximately 120 km northwest of Sacramento in the California Coast Range. The lake is a popular sport-fishing destination, however, there are fish consumption advisories associated with mercury (Hg) contamination for several species. The lake has three arms: a large open-water region to the northwest (Upper Arm), a smaller and narrower...
Filter Total Items: 20
Select elements of concern in surface water of three hydrologic basins (Delaware River, Illinois River, and Upper Colorado River)—Data screening for the development of spatial and temporal models Select elements of concern in surface water of three hydrologic basins (Delaware River, Illinois River, and Upper Colorado River)—Data screening for the development of spatial and temporal models
The report focuses on the screening of previously published concentration data associated with 12 elements of concern (aluminum, arsenic, cadmium, chromium, copper, iron, mercury, manganese, lead, selenium, uranium, and zinc) measured in stream surface waters of three hydrologic basins (Delaware River Basin, Illinois River Basin, and the Upper Colorado River Basin). The purpose of this...
Authors
Mark C. Marvin-DiPasquale, R. Blaine McCleskey, Samantha L. Sullivan, Jonathan Casey Root, Serena M. Seawolf, Katherine M. Ransom, Susan Wherry, Evangelos Kakouros, Shaun Baesman
The relative importance of mercury methylation and demethylation in rice paddy soil varies depending on the presence of rice plants The relative importance of mercury methylation and demethylation in rice paddy soil varies depending on the presence of rice plants
Neurotoxic methylmercury (MeHg) accumulates in rice grain from paddy soil, where its concentration is controlled by microbial mercury methylation and demethylation. Both up- and down-regulation of methylation is known to occur in the presence of rice plants in comparison to non-vegetated paddy soils; the influence of rice plant presence/absence on demethylation is unknown. To assess the...
Authors
R. J. Strickman, S. M. Larson, H. Huang, Evangelos Kakouros, Mark C. Marvin-DiPasquale, C. P. J. Mitchell, R. B. Neumann
Geochemical data for water, streambed sediment, and fish tissue from the Sierra Nevada Mercury Impairment Project, 2011–12 Geochemical data for water, streambed sediment, and fish tissue from the Sierra Nevada Mercury Impairment Project, 2011–12
This report presents geochemical data for surface water, streambed sediment, and fish tissue samples collected during low-flow conditions in 20 to 24 Sierra Nevada streams during 2011 and 2012. The dataset is part of a larger study designed to assess the factors that control mercury concentrations in fish tissue and to develop a model that predicts mercury concentration in the tissue of...
Authors
Elizabeth B. Stumpner, Charles N. Alpers, Mark C. Marvin-DiPasquale, Jennifer L. Agee, Evangelos Kakouros, Michelle R. Arias, Le H. Kieu, David A. Roth, Darrell G. Slotton, Jacob A. Fleck
Mercury methylation and bioaccumulation in Sinclair Inlet, Kitsap County, Washington Mercury methylation and bioaccumulation in Sinclair Inlet, Kitsap County, Washington
The U.S. Geological Survey evaluated the transformation of mercury to bioavailable methylmercury in Sinclair Inlet, Kitsap County, Washington, and assessed the effect of the transformation processes on the mercury burden in marine organisms and sediment. In August 2008, samples of sediment, water, and biota from six sites in Sinclair Inlet and three bays representative of Puget Sound...
Authors
A.J. Paulson, M.C. Marvin-DiPasquale, P.W. Moran, A.R. Stewart, J.F. DeWild, J. Toft, J.L. Agee, E. Kakouros, Le H. Kieu, B. Carter, R.W. Sheibley, J. Cordell, David P. Krabbenhoft
A practical method for the determination of total selenium in environmental samples using isotope dilution-hydride generation-inductively coupled plasma-mass spectrometry A practical method for the determination of total selenium in environmental samples using isotope dilution-hydride generation-inductively coupled plasma-mass spectrometry
A safe, practical, and accurate method for the determination of selenium (Se) in range of environmental samples was developed. Small sample masses, 5–20 mg, were amended with 82Se enriched isotope for the isotope dilution (ID), preceding a multi-step wet digestion with nitric acid (HNO3) and hydrogen peroxide (H2O2). Samples were incubated in an autoclave for 3 h at 20 psi and 126°C...
Authors
Amy E. Kleckner, Evangelos Kakouros, A. Robin Stewart
Methylmercury production in sediment from agricultural and non-agricultural wetlands in the Yolo Bypass, California, USA Methylmercury production in sediment from agricultural and non-agricultural wetlands in the Yolo Bypass, California, USA
As part of a larger study of mercury (Hg) biogeochemistry and bioaccumulation in agricultural (rice growing) and non-agricultural wetlands in California's Central Valley, USA, seasonal and spatial controls on methylmercury (MeHg) production were examined in surface sediment. Three types of shallowly-flooded agricultural wetlands (white rice, wild rice, and fallow fields) and two types of...
Authors
Mark Marvin-DiPasquale, Lisamarie Windham-Myers, Jennifer L. Agee, Evangelos Kakouros, Le H. Kieu, Jacob A. Fleck, Charles N. Alpers, Craig A. Stricker
Science and Products
Filter Total Items: 19
Geochemical Data for Mercury and Other Constituents in Shallow Sediment and Porewater from Clear Lake, Lake County, California Geochemical Data for Mercury and Other Constituents in Shallow Sediment and Porewater from Clear Lake, Lake County, California
Clear Lake, located in Lake County, California, is impacted by mercury contamination associated with the historic Sulfur Bank mercury mine, which is adjacent to the lake’s eastern shore / Oaks Arm region. As part of a larger study designed to better understand the biogeochemical cycling of mercury in Clear Lake, shallow sediment (top 0-2 cm or 0-4 cm) was sampled from the three major...
Geochemical data for selected streams in the Clear Lake basin, Lake County, California Geochemical data for selected streams in the Clear Lake basin, Lake County, California
This dataset includes water-quality data for samples collected at sixteen sites in the Clear Lake Drainage Basin, Lake County, California, between November 2018 and March 2024. Sampling in the reach of the Scotts Creek drainage below the confluence with South Fork Scotts Creek (USGS stations 11448800 and 390236122575901) was done during November 2018 to May 2019 (water year 2019; water...
Water-quality data including mercury and methylmercury at selected sites in the Cache Creek watershed, Yolo County, California Water-quality data including mercury and methylmercury at selected sites in the Cache Creek watershed, Yolo County, California
This dataset includes water-quality and sediment data for 647 environmental samples collected at 53 surface-water sites in Cache Creek (Cache C) watershed, Yolo County, California, between December 2009 and April 2019, and data for 190 associated quality-control samples (replicates and blanks). About 90 percent of the samples were collected at the following six primary sites that were...
Select elements of concern in surface water of three hydrologic basins (Delaware River, Illinois River and Upper Colorado River) — Data screening for the development of spatial and temporal models Select elements of concern in surface water of three hydrologic basins (Delaware River, Illinois River and Upper Colorado River) — Data screening for the development of spatial and temporal models
This data release is focused on the analysis of surface water concentration data associated with 12 elements of concern from three hydrologic basins. Data is analyzed with respect to: a) reporting limits, b) the extent of censored data, c) co-location with USGS real-time sensor data, and d) median concentrations at the catchment spatial scale. The Proxies Project (under the Water Quality...
Selenium in water, sediment, periphyton, benthic invertebrate and fish tissues from the Kootenai River, Idaho and Montana Selenium in water, sediment, periphyton, benthic invertebrate and fish tissues from the Kootenai River, Idaho and Montana
This dataset includes analyses of selenium (Se) in water, sediment, periphyton, and benthic invertebrate and fish tissues from the Kootenai River in Idaho and Montana. The samples were collected as part of a study intended to evaluate selenium distribution and bioaccumulation in the aquatic food webs of the Kootenai River. This dataset includes complete food web sample results from our...
Surface-Water Geochemistry of Mercury and other Constituents in Clear Lake, Lake County, California Surface-Water Geochemistry of Mercury and other Constituents in Clear Lake, Lake County, California
Clear Lake is a 180 km2 freshwater lake located approximately 120 km northwest of Sacramento in the California Coast Range. The lake is a popular sport-fishing destination, however, there are fish consumption advisories associated with mercury (Hg) contamination for several species. The lake has three arms: a large open-water region to the northwest (Upper Arm), a smaller and narrower...
Filter Total Items: 20
Select elements of concern in surface water of three hydrologic basins (Delaware River, Illinois River, and Upper Colorado River)—Data screening for the development of spatial and temporal models Select elements of concern in surface water of three hydrologic basins (Delaware River, Illinois River, and Upper Colorado River)—Data screening for the development of spatial and temporal models
The report focuses on the screening of previously published concentration data associated with 12 elements of concern (aluminum, arsenic, cadmium, chromium, copper, iron, mercury, manganese, lead, selenium, uranium, and zinc) measured in stream surface waters of three hydrologic basins (Delaware River Basin, Illinois River Basin, and the Upper Colorado River Basin). The purpose of this...
Authors
Mark C. Marvin-DiPasquale, R. Blaine McCleskey, Samantha L. Sullivan, Jonathan Casey Root, Serena M. Seawolf, Katherine M. Ransom, Susan Wherry, Evangelos Kakouros, Shaun Baesman
The relative importance of mercury methylation and demethylation in rice paddy soil varies depending on the presence of rice plants The relative importance of mercury methylation and demethylation in rice paddy soil varies depending on the presence of rice plants
Neurotoxic methylmercury (MeHg) accumulates in rice grain from paddy soil, where its concentration is controlled by microbial mercury methylation and demethylation. Both up- and down-regulation of methylation is known to occur in the presence of rice plants in comparison to non-vegetated paddy soils; the influence of rice plant presence/absence on demethylation is unknown. To assess the...
Authors
R. J. Strickman, S. M. Larson, H. Huang, Evangelos Kakouros, Mark C. Marvin-DiPasquale, C. P. J. Mitchell, R. B. Neumann
Geochemical data for water, streambed sediment, and fish tissue from the Sierra Nevada Mercury Impairment Project, 2011–12 Geochemical data for water, streambed sediment, and fish tissue from the Sierra Nevada Mercury Impairment Project, 2011–12
This report presents geochemical data for surface water, streambed sediment, and fish tissue samples collected during low-flow conditions in 20 to 24 Sierra Nevada streams during 2011 and 2012. The dataset is part of a larger study designed to assess the factors that control mercury concentrations in fish tissue and to develop a model that predicts mercury concentration in the tissue of...
Authors
Elizabeth B. Stumpner, Charles N. Alpers, Mark C. Marvin-DiPasquale, Jennifer L. Agee, Evangelos Kakouros, Michelle R. Arias, Le H. Kieu, David A. Roth, Darrell G. Slotton, Jacob A. Fleck
Mercury methylation and bioaccumulation in Sinclair Inlet, Kitsap County, Washington Mercury methylation and bioaccumulation in Sinclair Inlet, Kitsap County, Washington
The U.S. Geological Survey evaluated the transformation of mercury to bioavailable methylmercury in Sinclair Inlet, Kitsap County, Washington, and assessed the effect of the transformation processes on the mercury burden in marine organisms and sediment. In August 2008, samples of sediment, water, and biota from six sites in Sinclair Inlet and three bays representative of Puget Sound...
Authors
A.J. Paulson, M.C. Marvin-DiPasquale, P.W. Moran, A.R. Stewart, J.F. DeWild, J. Toft, J.L. Agee, E. Kakouros, Le H. Kieu, B. Carter, R.W. Sheibley, J. Cordell, David P. Krabbenhoft
A practical method for the determination of total selenium in environmental samples using isotope dilution-hydride generation-inductively coupled plasma-mass spectrometry A practical method for the determination of total selenium in environmental samples using isotope dilution-hydride generation-inductively coupled plasma-mass spectrometry
A safe, practical, and accurate method for the determination of selenium (Se) in range of environmental samples was developed. Small sample masses, 5–20 mg, were amended with 82Se enriched isotope for the isotope dilution (ID), preceding a multi-step wet digestion with nitric acid (HNO3) and hydrogen peroxide (H2O2). Samples were incubated in an autoclave for 3 h at 20 psi and 126°C...
Authors
Amy E. Kleckner, Evangelos Kakouros, A. Robin Stewart
Methylmercury production in sediment from agricultural and non-agricultural wetlands in the Yolo Bypass, California, USA Methylmercury production in sediment from agricultural and non-agricultural wetlands in the Yolo Bypass, California, USA
As part of a larger study of mercury (Hg) biogeochemistry and bioaccumulation in agricultural (rice growing) and non-agricultural wetlands in California's Central Valley, USA, seasonal and spatial controls on methylmercury (MeHg) production were examined in surface sediment. Three types of shallowly-flooded agricultural wetlands (white rice, wild rice, and fallow fields) and two types of...
Authors
Mark Marvin-DiPasquale, Lisamarie Windham-Myers, Jennifer L. Agee, Evangelos Kakouros, Le H. Kieu, Jacob A. Fleck, Charles N. Alpers, Craig A. Stricker