Publications
Dive into our publications and explore the science from the Environmental Health Program (Toxic Substances Hydrology and Contaminant Biology).
Filter Total Items: 3787
Intense alpha-particle emitting crystallites in uranium mill wastes
No abstract available.
Authors
E. R. Landa, L. R. Stieff, M.S. Germani, A.B. Tanner, J.R. Evans
Comparison of humic substances isolated from peatbog water by sorption on DEAE-cellulose and amberlite XAD-2
Aquatic humic substances (AHS) were isolated from peatbog water by adsorption (1) on diethylaminoethyl cellulose (DEAE-C) and (2) on Amberlite XAD-2 (XAD) to compare yields of the methods and the composition of the isolated AHS. To provide a detailed comparison, the isolates were fractionated using size-exclusion and hydrophobic-interaction chromatography on Sephadex G-50. The fractions were chara
Authors
J. Hejzlar, B. Szpakowska, R. L. Wershaw
Use of long-term tritium records from the Colorado River to determine timescales for hydrologic processes associated with irrigation in the Imperial Valley, California
Tritium records were used to study hydrologic processes associated with irrigation and drainage in the Imperial Valley, a 2000-km2 agricultural area in the southeastern California desert. Tritium was analyzed in surface water, ground water, soil-pore water and drain water, and the results were compared to the historical record of tritium in the Colorado River. The Colorado River record was reconst
Authors
Robert L. Michel, R.A. Schoeder
Coupling of hydrologic transport and chemical reactions in a stream affected by acid mine drainage
Experiments in St. Kevin Gulch, an acid mine drainage stream, examined the coupling of hydrologic transport to chemical reactions affecting metal concentrations. Injection of LiCl as a conservative tracer was used to determine discharge and residence time along a 1497-m reach. Transport of metals downstream from inflows of acidic, metal-rich water was evaluated based on synoptic samples of metal c
Authors
B. A. Kimball, R. E. Broshears, K.E. Bencala, Diane M. McKnight
Testing and comparison of four ionic tracers to measure stream flow loss by multiple tracer injection
The ionic tracers lithium, sodium, chloride and bromide were used to measure flow loss in a small stream (≈︁ 10 ls−1). An injectate containing all four tracers was added continuously at five sites along a 507 m study reach of St Kevin Gulch, Lake County, Colorado to determine which sections of the stream were losing water to the stream bed and to ascertain how well the four tracers performed. The
Authors
G. W. Zellweger
Herbicide interchange between a stream and the adjacent alluvial aquifer
Herbicide interchange between a stream and the adjacent alluvial aquifer and quantification of herbicide bank storage during high streamflow were investigated at a research site on the Cedar River flood plain, 10 km southeast of Cedar Rapids, Iowa. During high streamflow in March 1990, alachlor, atrazine, and metolachlor were detected at concentrations above background in water from wells as dista
Authors
Wuncheng Wang, P. Squillace
Degradation of methyl bromide in anaerobic sediments
No abstract available.
Authors
R.S. Oremland, L.G. Miller, F.E. Strohmaler
Preferential dealkylation reactions of s-triazine herbicides in the unsaturated zone
The preferential dealkylation pathways of the s-triazine herbicides, atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine), propazine [2-chloro-4,6-bis(isopropylamino)-s-triazine], and simazine [2-chloro-4,6-bis(ethylamino)-s-triazine], and two monodealkylated triazine metabolites, deisopropylatrazine (DIA: 2-amino-4-chloro-6-ethylamino-s-triazine) and deethylatrazine (DEA: 2-amino-4-chloro
Authors
M. S. Mills, Thurman E. Michael
Behavior of pollutant-degrading microorganisms in aquifers: Predictions for genetically engineered organisms
Bioremediation via environmental introductions of degradative microorganisms requires that the microbes survive in substantial numbers and effect an increase in the rate and extent of pollutant removal. Combined field and microcosm studies were used to assess these abilities for laboratory-grown bacteria. Following introduction into a contaminated aquifer, viable cells of Pseudomonas sp. B13 were
Authors
M.L. Krumme, R. L. Smith, J. Egestorff, S.M. Thiem, J.M. Tiedje, K.N. Timmis, D.F. Dwyer
Effects of polar and nonpolar groups on the solubility of organic compounds in soil organic matter
Vapor sorption capacities on a high-organic-content peat, a model for soil organic matter (SOM), were determined at room temperature for the following liquids: n-hexane, 1,4-dioxane, nitroethane, acetone, acetonitrile, 1-propanol, ethanol, and methanol. The linear organic vapor sorption is in keeping with the dominance of vapor partition in peat SOM. These data and similar results of carbon tetrac
Authors
C. T. Chiou, D. E. Kile
Model for dolomite formation in northwest Florida
Petrographic methods are used to examine the nature of the Floridan post-Oligocene unconformity and diagenetic responses in the associated carbonate units. The study addresses the depositional environment and the character of sediments associated with the unconformity, types and timing of diagenetic changes, and mode of dolomitization for the Suwannee Limestone dolomites and basal Hawthorn Group d
Authors
C.R. Cooper, J.A. Tindall
'The Kesterson effect'
Hypothesized to be derived from Cretaceous marine sedimentary rocks, selenium contamination of the Kesterson National Wildlife Refuge is traced through irrigation drainage to the source bedrock of the California Coast Ranges. This biogeochemical pathway of selenium is defined here as the 'Kesterson effect.' At the refuge ponds, this effect culminated in 1983 in a 64% rate of deformity and death of
Authors
T. S. Presser