Publications
Dive into our publications and explore the science from the Environmental Health Program (Toxic Substances Hydrology and Contaminant Biology).
Filter Total Items: 3746
Iron reduction in the sediments of a hydrocarbon-contaminated aquifer
Sediments sampled at a hydrocarbon-contaminated, glacial-outwash, sandy aquifer near Bemidji, Minnesota, were analyzed for sediment-associated Fe with several techniques. Extraction with 0.5 M HCl dissolved poorly crystalline Fe oxides and small amounts of Fe in crystalline Fe oxides, and extracted Fe from phyllosilicates. Use of Ti-citrate-EDTA-bicarbonate results in more complete removal of crys
Authors
M.E. Tuccillo, I.M. Cozzarelli, J.S. Herman
Correlation of soil and sediment organic matter polarity to aqueous sorption of nonionic compounds
Polarities of the soiL/sediment organic matter (SOM) in 19 soil and 9 freshwater sediment sam pies were determined from solid-state 13C-CP/MAS NMR spectra and compared with published partition coefficients (K(oc)) of carbon tetrachloride (CT) from aqueous solution. Nondestructive analysis of whole samples by solid-state NMR permits a direct assessment of the polarity of SOM that is not possible by
Authors
D. E. Kile, R. L. Wershaw, C. T. Chiou
Determination of pesticides associated with suspended sediments in the San Joaquin River, California, USA, using gas chromatography-ion trap mass spectrometry
An analytical method useful for the quantification of a range of pesticides and pesticide degradation products associated with suspended sediments was developed by testing a variety of extraction and cleanup schemes. The final extraction and cleanup methods chosen for use are suitable for the quantification of the listed pesticides using gas chromatography-ion trap mass spectrometry and the remova
Authors
B.A. Bergamaschi, D.S. Baston, K.L. Crepeau, K.M. Kuivila
Spectroscopic confirmation of uranium(VI)-carbonato adsorption complexes on hematite
Evaluating societal risks posed by uranium contamination from waste management facilities, mining sites, and heavy industry requires knowledge about uranium transport in groundwater, often the most significant pathway of exposure to humans. It has been proposed that uranium mobility in aquifers may be controlled by adsorption of U(VI)−carbonato complexes on oxide minerals. The existence of such co
Authors
John R. Bargar, Rebecca Reitmeyer, James A. Davis
Use and misuse of the chloride-mas balance method in estimating ground water recharge
No abstract available.
Authors
Warren W. Wood
Molecular analysis of microbial community structures in pristine and contaminated aquifers: Field and laboratory microcosm experiments
This study used phylogenetic probes in hybridization analysis to (i) determine in situ microbial community structures in regions of a shallow sand aquifer that were oxygen depleted and fuel contaminated (FC) or aerobic and noncontaminated (NC) and (ii) examine alterations in microbial community structures resulting from exposure to toluene and/or electron acceptor supplementation (nitrate). The la
Authors
Y. Shi, M.D. Zwolinski, M.E. Schreiber, J.M. Bahr, G.W. Sewell, W.J. Hickey
Bivalve biomarker workshop: Overview and discussion group summaries
No abstract available.
Authors
A.H. Ringwood, M.J. Hameedi, R.F. Lee, M. Brouwer, E. C. Peters, G.I. Scott, S. N. Luoma, R.T. Di Giulio
Is a probabilistic performance assessment enough?
No abstract available.
Authors
Leonard F. Konikow, Rodney C. Ewing
The interaction of natural organic matter with iron in a wetland (Tennessee Park, Colorado) receiving acid mine drainage
Pore water from a wetland receiving acid mine drainage was studied for its iron and natural organic matter (NOM) geochemistry on three different sampling dates during summer 1994. Samples were obtained using a new sampling technique that is based on screened pipes of varying length (several centimeters), into which dialysis vessels can be placed and that can be screwed together to allow for vertic
Authors
Stefan Peiffer, Katherine Walton-Day, Donald L. Macalady
Geochemical heterogeneity of a gasoline-contaminated aquifer
The scale of biogeochemical reactions was studied in a physically and chemically heterogeneous surficial Coastal Plain aquifer contaminated by a gasoline spill. The physical heterogeneity of the aquifer is manifested in two hydrologic units, a shallow local aquifer of perched water and a regional sandy aquifer. Over the studied vertical interval of 21.3 ft (6.5 m), concentrations of reactive speci
Authors
Isabelle M. Cozzarelli, Janet S. Herman, Mary Jo Baedecker, Jeffrey M. Fischer
Seasonal and annual load of herbicides from the Mississippi River Basin to the Gulf of Mexico
Water samples collected from rivers in the Mississippi River Basin were analyzed for selected herbicides to evaluate their discharge to the Gulf of Mexico and to identify their predominant source areas within the basin. Samples were collected from the Mississippi River at Baton Rouge, LA from 1991 to 1997 and from sites on the upper Mississippi, the Missouri, and the Ohio Rivers from 1996 to 1997.
Authors
G. M. Clark, D. A. Goolsby, W.A. Battaglin
Adsorption of bacteriophages on clay minerals
The ability to predict the fate of microorganisms in soil is dependent on an understanding of the process of their sorption on soil and subsurface materials. Presently, we have focused on studying the thermodynamics of sorption of bacteriophages (T-2, MS-2, and φX-174) on clays (hectorite, saponite, kaolinite, and clay fraction of samples collected from a landfill site). The thermodynamic study no
Authors
Sandip Chattopadhyay, Robert W. Puls