Publications
Dive into our publications and explore the science from the Environmental Health Program (Toxic Substances Hydrology and Contaminant Biology).
Filter Total Items: 4094
Chemical factors influencing colloid-facilitated transport of contaminants in porous media
The effects of colloids on the transport of two strongly sorbing solutesa hydrophobic organic compound, phenanthrene, and a metal ion, Ni2+were studied in sand-packed laboratory columns under different pH and ionic strength conditions. Two types of column experiments were performed as follows: (i) sorption/mobilization experiments where the contaminant was first sorbed in the column under conditi
Authors
Sujoy B. Roy, David A. Dzombak
Anaerobic degradation of benzene in diverse anoxic environments
Benzene has often been observed to be resistant to microbial degradation under anoxic conditions. A number of recent studies, however, have demonstrated that anaerobic benzene utilization can occur. This study extends the previous reports of anaerobic benzene degradation to sediments that varied with respect to contamination input, predominant redox condition, and salinity. In spite of differences
Authors
J. Kazumi, M.E. Caldwell, J.M. Suflita, D.R. Lovely, L.Y. Young
Transformations of TNT and related aminotoluenes in groundwater aquifer slurries under different electron-accepting conditions
The transport and fate of pollutants is often governed by both their tendency to sorb as well as their susceptibility to biodegradation. We have evaluated these parameters for 2,4,6-trinitrotoluene (TNT) and several biodegradation products. Slurries of aquifer sediment and groundwater depleted TNT at rates of 27, 7.7 and 5.9 μM day−1 under methanogenic, sulfate-reducing and nitrate-reducing condit
Authors
L.R. Krumholz, J. Li, W.W. Clarkson, G.G. Wilber, J.M. Suflita
In situ and laboratory methods to study subsurface microbial transport
No abstract available.
Authors
Ronald W. Harvey
Comparative results of 27A1 NMR spectrometric and ferron colorimetric analyses of hydroxaluminum hydrolysis products in aged mildly acidic aqueous systems
No abstract available.
Authors
D.V. Vivit, Karen M. Thorne, J. D. Hem
Geochemistry of the processes that attenuate acid mine drainage in wetlands
Because conventional treatment of acid-mine drainage (AMD) involves installation and maintenance of water treatment plants, regulators and mine operators have sought lower cost and lower maintenance technologies. One ecological engineering technology that has received increasing research attention is the use of natural and constructed wetlands for remediation of some of the water-quality problems
Authors
Katherine Walton-Day
EM Induction and DC Resistivity surveys near the Norman, Oklahoma Landfill - text and figures for the WRD Norman web site
No abstract available.
Authors
Jeff E. Lucius, R. J. Bisdorf
Geochemical modeling of water-rock interactions in mining environments
Geochemical modeling is a powerful tool for evaluating geochemical processes in mining environments. Properly constrained and judiciously applied, modeling can provide valuable insights into processes controlling the release, transport, and fate of contaminants in mine drainage. This chapter contains 1) an overview of geochemical modeling, 2) discussion of the types of models and computer programs
Authors
Charles N. Alpers, D. Kirk Nordstrom
Mass balance approach to selenium cycling through the San Joaquin Valley, sources to river to bay
Surface and ground waters of the Central Valley of California (e.g., rivers, dams, off-stream storage reservoirs, pumping facilities, irrigation and drinking water supply canals, agricultural drainage canals) are part of a hydrologic system that makes up a complex ecosystem extending from the riparian wetlands of the Sacramento and San Joaquin Rivers through the San Francisco Bay/Delta Estuary to
Authors
Theresa S. Presser, David Z. Piper
Seasonal variation in metal concentrations in a stream affected by acid mine drainage, St. Kevin Gulch, Colorado
Mining of mineral deposits in the Rocky Mountains has left a legacy of acidic inflows to otherwise pristine upland watersheds. Since 1986, the U.S. Geological Survey has studied physical, chemical, and biological processes that affect the transport and transformation of metals in St. Kevin Gulch, an acidic, metal-rich stream near Leadville, Colorado. Well-known chemical processes have been quantif
Authors
B. A. Kimball
Dissolved nutrient data for the San Francisco Bay Estuary, California, January through November 1995
The U.S. Geological Survey conducted hydrologic investigations in San Francisco Bay between January and November of 1995. Dissolved inorganic plant nutrients, nitrate, nitrite, ammonium, silica, and reactive phosphorus were measured in surface and in near-bottom waters at previously established locations in the channel portions of both northern and southern reaches of the bay, and at shallow water
Authors
Stephen W. Hager, Laurence E. Schemel