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Dive into our publications and explore the science from the Environmental Health Program (Toxic Substances Hydrology and Contaminant Biology).

GeoHEALTH-USGS Newsletter

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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.

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Featured Science Activities

Brown Bullhead from the Ashtabula River Illustrating the External Tumors Observed

Learn about our Featured Science Activities through our pages that highlight studies, publications, and results.

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Modeling the effects of variable groundwater chemistry on adsorption of molybdate

Laboratory experiments were used to identify and quantify processes having a significant effect on molybdate (MoO42−) adsorption in a shallow alluvial aquifer on Cape Cod, assachusetts. Aqueous chemistry in the aquifer changes as a result of treated sewage effluent mixing with groundwater. Molybdate adsorption decreased as pH, ionic strength, and the concentration of competing anions increased. A
Authors
Kenneth G. Stollenwerk
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

Sorption and coprecipitation of trace concentrations of thorium with various minerals under conditions simulating an acid uranium mill effluent environment

Sorption of thorium by pre-existing crystals of anglesite (PbSO4), apatite (Ca5(PO4)3(HO)), barite (BaSO4), bentonite (Na0.7Al3.3Mg0.7Si8O20(OH)4), celestite (SrSO4), fluorite (CaF2), galena (PbS), gypsum (CaSO4·2H2O), hematite (Fe2O3), jarosite (KFe3(SO4)2(OH)6), kaolinite (Al2O3·2SiO2·2H2O), quartz (SiO2) and sodium feldspar (NaAlSi3O8) was studied under conditions that simulate an acidic uraniu
Authors
Edward R. Landa, Anh H. Le, Rudy L. Luck, Philip J. Yeich
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

Deducing the distribution of terminal electron-accepting processes in hydrologically diverse groundwater systems

The distribution of microbially mediated terminal electron-accepting processes (TEAPs( was investigated in four hydrologically diverse groundwater systems by considering patterns of electron acceptor (nitrate, sulfate) consumption, intermediate product (hydrogen (H2)) concentrations, and final product (ferrous iron, sulfide, and methane) production. In each hydrologic system a determination of pre
Authors
Francis H. Chapelle, Peter B. McMahon, Neil M. Dubrovsky, Roger F. Fujii, Edward T. Oaksford, Don A. Vroblesky
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, California Water Science Center

An updated model of induced airflow in the unsaturated zone

Simulation of induced movement of air in the unsaturated zone provides a method to determine permeability and to design vapor extraction remediation systems. A previously published solution to the airflow equation for the case in which the unsaturated zone is separated from the atmosphere by a layer of lower permeability (such as a clay layer) has been superseded. The new solution simulates airflo
Authors
Arthur L. Baehr, Craig J. Joss
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

Applications of the transient tracers tritium/helium-3, and chlorofluorocarbons for tracing and age-dating yound ground water: Field examples from the USA and Germany

The transient tracers tritium/helium-3 (3H/3He) and chlorofluorocarbons (CFC-11, CFC-12, CFC-113) are well suited for tracing and age-dating young ground water. Their detection in ground water indicates waters recharged within the past 30 (3H/3He, CFC-113) to 50 (CFC-11, CFC-12) years, or ground water mixtures that contain at least a portion of young water. The ground water age can be determined i
Authors
S. Drenkard, Niel Plummer, Eurybiades Busenberg, P. Schlosser, M. Stute, H. Dorr
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

Interpreting spatial profiles of concentration in acid mine drainage streams

No abstract available. 
Authors
R. E. Broshears, Briant A. Kimball, Robert L. Runkel
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Colorado Water Science Center, Utah Water Science Center

The value of postaudits in groundwater model applications

No abstract available.
Authors
Leonard F. Konikow
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

Relations between stream temperature discharge, and stream/groundwater interaction along several mountain streams

No abstract available.
Authors
James Constantz, G. Zellweger
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

Occurrence and distribution of pesticides in streams of the Midwestern United States

No abstract available. 
Authors
D. A. Goolsby, William A. Battaglin
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Colorado Water Science Center

Isotope tracers on water and solute sources in catchments

No abstract available. 
Authors
Carol Kendall, C. Sklash, Thomas D. Bullen
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

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 the proces
Authors
Robert L. Runkel, Kenneth E. Bencala
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Colorado Water Science Center

The role of climate in estuarine variability

No abstract available. 
Authors
D.H. Peterson, D. Cayan, J. DiLeo, M. Noble, M. Dettinger
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program