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: 3784
Water solubility enhancements of DDT and trichlorobenzene by some surfactants below and above the critical micelle concentration Water solubility enhancements of DDT and trichlorobenzene by some surfactants below and above the critical micelle concentration
Water solubility enhancements of 1,1-bis(p-chlorophenyl)-2,2,2-trichloroethane (DDT) and 1,2,3-trichlorobenzene (TCB) by aqueous surfactants below and above their critical micelle concentrations (CMCs) have been studied at room temperature with the following surfactants: Triton X-100, Triton X-114, Triton X-405, Brij 35, sodium dodecyl sulfate, and cetyltrimethylammonium bromide. While...
Authors
D. E. Kile, C. T. Chiou
Circular convection during subsurface injection of liquid waste, St. Petersburg, Florida Circular convection during subsurface injection of liquid waste, St. Petersburg, Florida
Injection of liquid waste into a highly transmissive, saltwater-bearing, fractured dolomite underlying the city of St. Petersburg, Florida, provided an opportunity to study density-dependent flow associated with two miscible and density-different liquids. The injection zone was 98 m thick with a radial hydraulic conductivity of 762 m/d and a vertical hydraulic conductivity of 152 m/d...
Authors
John J. Hickey
Book review--"Coupled processes associated with nuclear waste repositories" Book review--"Coupled processes associated with nuclear waste repositories"
No abstract available.
Authors
D. Kirk Nordstrom
The dissolution of quartz in dilute aqueous solutions of organic acids at 25°C The dissolution of quartz in dilute aqueous solutions of organic acids at 25°C
The dissolution of quartz in dilute aqueous solutions of organic acids at 25° and standard pressure was investigated by the batch dissolution method. The bulk dissolution rate of quartz in 20 mmole/Kg citrate solutions at pH 7 was 8 to 10 times faster than that in pure water. After 1750 hours the concentration of dissolved silica in the citrate solution was 167 μmole/Kg compared to 50...
Authors
P.C. Bennett, M.E. Melcer, D. I. Siegel, J.P. Hassett
Denitrification in a sand and gravel aquifer Denitrification in a sand and gravel aquifer
Denitrification was assayed by the acetylene blockage technique in slurried core material obtained from a freshwater sand and gravel aquifer. The aquifer, which has been contaminated with treated sewage for more than 50 years, had a contaminant plume greater than 3.5-km long. Near the contaminant source, groundwater nitrate concentrations were greater than 1 mM, whereas 0.25 km...
Authors
R. L. Smith, J.H. Duff
Arsenic in ground water of the Western United States Arsenic in ground water of the Western United States
Natural occurrences of ground water with moderate (10 to 50 micrograms per liter) to high (greater than 50 micrograms per liter) concentrations of arsenic are common throughout much of the Western United States. High concentrations of arsenic are generally associated with one of four geochemical environments: (1) basin-fill deposits of alluvial-lacustrine origin, particularly in semiarid...
Authors
Alan H. Welch, Michael S. Lico, Jennifer L. Hughes
Iron photoreduction and oxidation in an acidic mountain stream Iron photoreduction and oxidation in an acidic mountain stream
In a small mountain stream in Colorado that receives acidic mine drainage, photoreduction of ferric iron results in a well-defined increase in dissolved ferrous iron during the day. To quantify this process, an instream injection of a conservative tracer was used to measure discharge at the time that each sample was collected. Daytime production of ferrous iron by photoreduction was...
Authors
D.M. McKnight, B. A. Kimball, K.E. Bencala
Discussion of "Flume tests on hydrocarbon reaeration tracer gases" Discussion of "Flume tests on hydrocarbon reaeration tracer gases"
No abstract available.
Authors
Ronald E. Rathbun
Internal inconsistencies in dispersion-dominated models that incorporate chemical and microbial kinetics Internal inconsistencies in dispersion-dominated models that incorporate chemical and microbial kinetics
Current understanding of transport processes in aquifers is limited by lack of precise point chemical concentration measurements. Recently, however, some careful measurements of vertical chemical concentration profiles have been made at several locations around the world that appear to support a consistent picture concerning the persistence of large vertical concentration gradients in...
Authors
Fred J. Molz, Mark A. Widdowson
Use of electrothermal vaporization-multiple-wavelength absorption spectrometry to qualitatively screen for the presence of polycyclic aromatic hydrocarbons Use of electrothermal vaporization-multiple-wavelength absorption spectrometry to qualitatively screen for the presence of polycyclic aromatic hydrocarbons
No abstract available
Authors
Joseph M. Shekiro, Rodney K. Skogerboe, Howard E. Taylor
Discussion of "Wind function for a sheltered stream" Discussion of "Wind function for a sheltered stream"
No abstract available.
Authors
R.E. Rathburn
Trace contaminants in streams Trace contaminants in streams
No abstract available.
Authors
James S. Kuwabara, P. Helliker