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
Lean about our Featured Science Activities through our pages that highlight science studies, publications, and results.
Filter Total Items: 3785
Relations between stream temperature discharge, and stream/groundwater interaction along several mountain streams Relations between stream temperature discharge, and stream/groundwater interaction along several mountain streams
No abstract available.
Authors
James Constantz, G. Zellweger
Occurrence and distribution of pesticides in streams of the Midwestern United States Occurrence and distribution of pesticides in streams of the Midwestern United States
No abstract available.
Authors
D. A. Goolsby, William A. Battaglin
Isotope tracers on water and solute sources in catchments Isotope tracers on water and solute sources in catchments
No abstract available.
Authors
Carol Kendall, C. Sklash, Thomas D. Bullen
Transport of reacting solutes in rivers and streams Transport of reacting solutes in rivers and streams
In this chapter we discuss the major processes affecting solutes in rivers and streams. Here a solute is generally defined as any substance or entity that is transported downstream by the flowing waters. Under this definition, solutes may be pollutants, such as pesticides and hydrocarbons, or naturally occurring substances such as dissolved gases, nutrients, and trace elements. Study of...
Authors
Robert L. Runkel, Kenneth E. Bencala
The role of climate in estuarine variability The role of climate in estuarine variability
No abstract available.
Authors
D. H. Peterson, D. Cayan, J. DiLeo, M. Noble, M. Dettinger
Pathway models could aid management of contaminants Pathway models could aid management of contaminants
Heavy metal and trace organic contaminants are often cited as factors that could affect the riclmess of the biological community of San Francisco Bay as well as the health of resident organisms. Silver (Ag), selenium (Se), mercury (Hg), copper (Cu), nickel (Ni), chromium (Cr), and cadmium (Cd) are among the trace elements of current regulatory interest. All these elements can be toxic to...
Authors
S. N. Luoma
Altitude and configuration of the water table, western Cape Cod aquifer, Massachusetts, March 1993 Altitude and configuration of the water table, western Cape Cod aquifer, Massachusetts, March 1993
No abstract available.
Authors
Jennifer G. Savoie
Methylmercury oxidative degradation potentials in contaminated and pristine sediments of the Carson River, Nevada Methylmercury oxidative degradation potentials in contaminated and pristine sediments of the Carson River, Nevada
Sediments from mercury-contaminated and uncontaminated reaches of the Carson River, Nevada, were assayed for sulfate reduction, methanogenesis, denitrification, and monomethylmercury (MeHg) degradation. Demethylation of [14C]MeHg was detected at all sites as indicated by the formation of 14CO2 and 14CH4. Oxidative demethylation was indicated by the formation of 14CO2 and was present at...
Authors
R.S. Oremland, L.G. Miller, P. Dowdle, T. Connell, T. Barkay
Rapid toluene mineralization by aquifer microorganisms at Adak, Alaska: Implications for intrinsic bioremediation in cold environments Rapid toluene mineralization by aquifer microorganisms at Adak, Alaska: Implications for intrinsic bioremediation in cold environments
No abstract available.
Authors
P. M. Bradley, F. H. Chapelle
Transport behavior of groundwater protozoa and protozoan-sized microspheres in sandy aquifer sediments Transport behavior of groundwater protozoa and protozoan-sized microspheres in sandy aquifer sediments
Transport behaviors of unidentified flagellated protozoa (flagellates) and flagellate-sized carboxylated microspheres in sandy, organically contaminated aquifer sediments were investigated in a small-scale (1 to 4-m travel distance) natural-gradient tracer test on Cape Cod and in flow-through columns packed with sieved (0.5-to 1.0-mm grain size) aquifer sediments. The minute (average in...
Authors
R.W. Harvey, N.E. Kinner, A. Bunn, Duncan MacDonald, D. Metge
Characterization of a high-transmissivity zone by well test analysis: Steady state case Characterization of a high-transmissivity zone by well test analysis: Steady state case
A method is developed to analyze steady horizontal flow to a well pumped from a confined aquifer composed of two homogeneous zones with contrasting transmissivities. Zone 1 is laterally unbounded and encloses zone 2, which is elliptical in shape and is several orders of magnitude more transmissive than zone 1. The solution for head is obtained by the boundary integral equation method...
Authors
Claire R. Tiedeman, Paul A. Hsieh, Sarah B. Christian
A comparison of two nitrification inhibitors used to measure nitrification rates in estuarine sediments A comparison of two nitrification inhibitors used to measure nitrification rates in estuarine sediments
Nitrification rates were measured using intact sediment cores from South San Francisco Bay and two different nitrification inhibitors: acetylene and methyl fluoride. Sediment oxygen consumption and ammonium and nitrate fluxes were also measured in these cores. Four experiments were conducted in the spring, and one in the fall of 1993. There was no significant difference in nitrification...
Authors
J.M. Caffrey, L.G. Miller