Publications
Dive into our publications and explore the science from the Environmental Health Program (Toxic Substances Hydrology and Contaminant Biology).
Filter Total Items: 3787
The travel times of solutes at the Cape Cod Tracer Experiment: Data analysis, modeling, and structural parameters inference
A method for analyzing and interpreting travel times of solutes in heterogeneous aquifers is presented based on the peak concentration arrival times as measured at various samplers in the aquifer. The method allows separation of the effects of pore-scale dispersion from the effects of the large-scale aquifer heterogeneity. An analysis of data from the Cape Cod field experiment is presented, and we
Authors
Yoram Rubin, Souheil Ezzedine
USGS research on saline waters co-produced with energy resources
The United States energy industry faces the challenge of satisfying our expanding thirst for energy while protecting the environment. This challenge is magnified by the increasing volumes of saline water produced with oil and gas in the Nation's aging petroleum fields. Ultimately, energy-producing companies are responsible for disposing of these waters. USGS research provides basic information, fo
Authors
Numerical simulation of ground-water flow through glacial deposits and crystalline bedrock in the Mirror Lake area, Grafton County, New Hampshire
This report documents the development of a computer model to simulate steady-state (long-term average) flow of ground water in the vicinity of Mirror Lake, which lies at the eastern end of the Hubbard Brook valley in central New Hampshire. The 10-km2 study area includes Mirror Lake, the three streams that flow into Mirror Lake, Leeman's Brook, Paradise Brook, and parts of Hubbard Brook and the Pem
Authors
Claire R. Tiedeman, Daniel J. Goode, Paul A. Hsieh
A rapid and simple method for estimating sulfate reduction activity and quantifying inorganic sulfides
A simplified passive extraction procedure for quantifying reduced inorganic sulfur compounds from sediments and water is presented. This method may also be used for the estimation of sulfate reduction rates. Efficient extraction of FeS, FeS2, and S2- was obtained with this procedure; however, the efficiency for S0 depended on the form that was tested. Passive extraction can be used with samples co
Authors
G.A. Ulrich, L.R. Krumholz, J.M. Suflita
Estimating ground-water recharge from streamflow hydrographs for a small mountain watershed in a temperate humid climate, New Hampshire, USA
Hydrographs of stream discharge were analyzed to determine ground-water recharge for two small basins draining into Mirror Lake, New Hampshire. Two methods of hydrograph analysis developed for determining ground-water recharge were evaluated, the instantaneous recharge method and the constant recharge method. For the instantaneous recharge method, recharge is assumed to be instantaneous and unifor
Authors
David P. Mau, Thomas C. Winter
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