Publications
Dive into our publications and explore the science from the Environmental Health Program (Toxic Substances Hydrology and Contaminant Biology).
GeoHEALTH-USGS Newsletter
GeoHEALTH-USGS Newsletter
The GeoHEALTH–USGS Newsletter—published since 2004—provides information on USGS science activities pertinent to safeguarding the health of fish, wildlife, domesticated animals, and people from environmental exposures to contaminants and pathogens.
Featured Science Activities
Featured Science Activities
Learn about our Featured Science Activities through our pages that highlight studies, publications, and results.
Filter Total Items: 4097
Nonpoint source contamination of the Mississippi river and its tributaries by herbicides Nonpoint source contamination of the Mississippi river and its tributaries by herbicides
A study of the Mississippi River and its tributaries during July-August 1991, October-November 1991, and April-May 1992 has indicated that the entire navigable reach of the river is contaminated with a complex mixture of agrochemicals and their transformation products derived from nonpoint sources. Twenty-three compounds were identified, including triazine, chloroacetanilide...
Authors
W. E. Pereira, F. D. Hostettler
Distribution and significance of dicarboxylic acid anions in oil field waters Distribution and significance of dicarboxylic acid anions in oil field waters
No abstract available.
Authors
Y.K. Kharaka, G. Ambats, J.J. Thordsen
U. S. Geological Survey Toxic Substances Hydrology Program--Abstracts of the Technical Meeting, Colorado Springs, Colorado, September 20-24, 1993 U. S. Geological Survey Toxic Substances Hydrology Program--Abstracts of the Technical Meeting, Colorado Springs, Colorado, September 20-24, 1993
No abstract available.
Authors
David W. Morganwalp, David A. Aronson
Ground-water quality at the Management Systems Evaluation Area (MSEA) near Princeton, Minnesota, 1991 Ground-water quality at the Management Systems Evaluation Area (MSEA) near Princeton, Minnesota, 1991
The northern cornbelt sand-plains Management Systems Evaluation Area (MSEA) program is a multiagency, multistate initiative to evaluate the effects of modified and prevailing fanning systems on water quality in a sand-plain area in Minnesota and at satellite areas in North and South Dakota, and Wisconsin (Delin and others, 1992). The primary objective of the northern cornbelt sand-plains...
Authors
Matthew K. Landon, Geoffrey N. Delin, J.A. Lamb, Laodong Guo
Model for humus in soils and sediments Model for humus in soils and sediments
No abstract available.
Authors
R.L. Wershaw
Sorption of N2 and EGME vapors on some soils, clays, and mineral oxides and determination of sample surface areas by use of sorption data Sorption of N2 and EGME vapors on some soils, clays, and mineral oxides and determination of sample surface areas by use of sorption data
Vapor sorption isotherms of ethylene glycol monoethyl ether (EGME) at room temperature and isotherms of N2 gas at liquid nitrogen temperature were determined for various soils and minerals. The N2 monolayer capacities [Qm (N2)] were calculated from the BET equation and used to determine the surface areas. To examine whether EGME is an appropriate adsorbate for determination of surface...
Authors
C. T. Chiou, D.W. Rutherford, M. Manes
Atrazine degradation in a small stream in Iowa Atrazine degradation in a small stream in Iowa
A study was conducted during 1990 through an 11.2-km reach of Roberts Creek in northeastern Iowa to determine the fate of atrazine in a surface water environment Water samples were collected at ~1-month intervals from April through November during stable low to medium flow conditions and analyzed for atrazine and two of its initial biotic degradation products, desethylatrazine and
Authors
D.W. Kolpin, S. J. Kalkhoff
Monte Carlo simulations of multiphase flow incorporating spatial variability of hydraulic properties Monte Carlo simulations of multiphase flow incorporating spatial variability of hydraulic properties
To study the effect of spatial variability of sediment hydraulic properties on multiphase flow, oil infiltration into a hypothetical glacial outwash aquifer, followed by oil extraction, was simulated using a cross-sectional multiphase flow model. The analysis was simplified by neglecting capillary hysteresis. The first simulation used a uniform mean permeability and mean retention curve...
Authors
Hedeff I. Essaid, Kathryn M. Hess
Effect of treated-sewage contamination upon bacterial energy charge, adenine nucleotides, and DNA content in a sandy aquifer on Cape Cod Effect of treated-sewage contamination upon bacterial energy charge, adenine nucleotides, and DNA content in a sandy aquifer on Cape Cod
Changes in adenylate energy charge (ECA) and in total adenine nucleotides (AT) and DNA content (both normalized to the abundance of free-living, groundwater bacteria) in response to carbon loading were determined for a laboratory-grown culture and for a contaminated aquifer. The latter study involved a 3-km-long transect through a contaminant plume resulting from continued on-land...
Authors
David W. Metge, Myron H. Brooks, Richard L. Smith, Ronald W. Harvey
Coupling solid-phase extraction and enzyme-linked immunosorbent assay for ultratrace determination of herbicides in pristine water Coupling solid-phase extraction and enzyme-linked immunosorbent assay for ultratrace determination of herbicides in pristine water
No abstract available.
Authors
D.S. Aga, E.M. Thurman
An efficient numerical solution of the transient storage equations for solute transport in small streams An efficient numerical solution of the transient storage equations for solute transport in small streams
Several investigators have proposed solute transport models that incorporate the effects of transient storage. Transient storage occurs in small streams when portions of the transported solute become isolated in zones of water that are immobile relative to water in the main channel (e.g., pools, gravel beds). Transient storage is modeled by adding a storage term to the advection...
Authors
Robert L. Runkel, Steven C. Chapra
Trace contaminants and nutrients in estuaries: The importance of process interdependence Trace contaminants and nutrients in estuaries: The importance of process interdependence
No abstract available.
Authors
J.S. Kuwabara, J.E. Baker