Publications
Dive into our publications and explore the science from the Environmental Health Program (Toxic Substances Hydrology and Contaminant Biology).
Filter Total Items: 3740
Selected meteorological data for an arid site near Beatty, Nye County, Nevada, calendar year 1986
Selected meteorological data were collected at a study site adjacent to a low-level radioactive-waste burial facility near Beatty, Nevada, for calendar year 1986. Data were collected in support of an ongoing study to estimate the potential for downward movement of radionuclides into the unsaturated sediments beneath waste-burial trenches at the facility. The data include air temperature, relative
Authors
James L. Wood, Jeffrey M. Fischer
Selected hydrologic data for the upper Arkansas River basin, Colorado, 1986-89
No abstract available.
Authors
Gregory A. Wetherbee, Briant A. Kimball, Wendy S. Maura
Uptake and physiological antagonism of selenium and sulfur in alfalfa and wheat under field conditions, San Joaquin Valley, California
No abstract available.
Authors
R. C. Severson, L. P. Gough, J. G. Crock, D. L. Fey, P. L. Hageman, A.H. Love, T.R. Peacock
Trace metals in clams (Macoma Balthica) and sediments at the Palo Alto mudflat in south San Francisco Bay: April, 1990 - April, 1991
No abstract available.
Authors
Samuel N. Luoma, Daniel J. Cain, Cynthia Brown, Ellen V. Axtmann
Time-courses in the retention of food material in the bivalves Potamocorbula amurensis and Macoma balthica significance to the absorption of carbon and chromium
Time courses for ingestion, retention and release via feces of microbial food was investigated using 2 bivalves with different feeding strategies, Potamocorbula amurensis and Macoma balthica. The results showed 2 pathways for the uptake of food material in these clams. The first is represented by an initial label pulse in the feces. The second pathway operates over longer time periods. Inert 51Cr-
Authors
Alan W. Decho, Samuel N. Luoma
Flame ionization mass spectrometry--Isotope ratio determinations for potassium
The air/acetylene flame provides a convenient ion source for the determination of potassium isotopic ratios by mass spectrometry. Unlike the argon inductively coupled plasma (ICP), the flame provides low background in the mass region of interest. Ion production is quite satisfactory for isotope ratio measurements at the micrograms per milliliter (μg/mL) level and slightly below, with 1 μg/mL potas
Authors
Howard E. Taylor, John R. Garbarino, S.R. Koirtyohann
Downstream effects of mine effluent on an intermontane riparian system
Metal concentrations were determined in benthic biota, fish livers, water, and fine-grained sediment through 215 km of an intermontane river system (Blackfoot River, Montana, USA) affected by headwater inputs of acid-mine effluent. Solute and particulate contaminants decreased rapidly downstream from headwater sources, but some extended through an extensive marsh system. Particulate contaminants p
Authors
Johnnie N. Moore, Samuel N. Luoma, Donald Peters
Reduction of nitrate in aquifer microcosms by carbon additions
Aquifer microcosms were used to examine the effects of NO−3 and C amendments on groundwater from the Claiborne aquifer. Nitrate concentrations of 12.17 mg L−1 in aquifer microcosms were reduced 0.92%/d to 5.84 mg L−1 by the addition of 10 mg C L−1 for 35 d. Nitrate disappearance correlated with increases in number of denitrifiers and dissolved N2O concentration and decreases in dissolved oxygen, s
Authors
Donald C. Obenhuber, Richard Lowrance
Fate of silicate minerals in a peat bog
An investigation of silicate weathering in a Minnesota mire indicates that quartz and aluminosilicates rapidly dissolve in anoxic, organic-rich, neutral- pH environments. Vertical profiles of pH, dissolved silicon, and major cations were obtained at a raised bog and a spring fen and compared. Profiles of readily extractable silicon, diatom abundance, ash mineralogy, and silicate surface texture we
Authors
Philip C. Bennett, Donald I. Siegel, Barbara M. Hillier, Paul H. Glaser
Formation and transport of deethylatrazine in the soil and vadose zone
Atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine) and two degradation products were monitored at seven depths in the soil and vadose zone throughout the growing season in two experimental plots in which corn (Zea mays L.) was grown. The soils in these plots were a Kimo silty clay loam (clayey over loamy, montmorillonitic, mesic, Fluvaquentic Hapludoll) and a Eudora silt loam (course, si
Authors
C.D. Adams, E. M. Thurman
Analytical results for sedge samples collected on the wetland receiving acid mine drainage waters from St. Kevin Gulch, Leadville, Colorado
No abstract available.
Authors
B.M. Erickson, Paul H. Briggs, K. R. Kennedy, T.R. Peacock
Methylmercury decomposition in sediments and bacterial cultures: Involvement of methanogens and sulfate reducers in oxidative demethylation
Demethylation of monomethylmercury in freshwater and estuarine sediments and in bacterial cultures was investigated with 14CH3HgI. Under anaerobiosis, results with inhibitors indicated partial involvement of both sulfate reducers and methanogens, the former dominating estuarine sediments, while both were active in freshwaters. Aerobes were the most significant demethylators in estuarine sediments,
Authors
R.S. Oremland, C.W. Culbertson, M.R. Winfrey