Publications
Dive into our publications and explore the science from the Environmental Health Program (Toxic Substances Hydrology and Contaminant Biology).
Filter Total Items: 4094
Problems and methods involved in relating land use to ground-water quality
Efforts to relate shallow ground-water quality to the land use near a well lead to several statistical difficulties. These include potential uncertainty in land-use categorical data due to misclassification, data closure, distributional skewing, and spatial autocorrelation. Methods of addressing these problems are, respectively, the establishment of limits on minimum buffer radius, the estimation
Authors
Thomas Barringer, Dennis Dunn, William Battaglin, Eric Vowinkel
Hydrogeochemistry of rivers and lakes
This chapter has three principal objectives: (1) to summarize the present chemical composition of North American surface waters and point out any discernible trends with time; (2) to review chemical and biochemical principles and processes that control natural water composition, and the ways in which these may be involved in attaining the particular chemical compositions and trends that we can obs
Authors
John David Hem, Adrian Demayo, Richard A. Smith
Roles of organic matter, minerals, and moisture in sorption of nonionic compounds and pesticides by soil
No abstract available.
Authors
C. T. Chiou
The production and variability of acid mine drainage at Iron Mountain, California: A superfund site undergoing rehabilitation
No abstract available.
Authors
D. Kirk Nordstrom, J.M. Burchard, Charles N. Alpers
Origin of solutes in saline lakes and springs on the Southern High Plains of Texas and New Mexico
Analysis of hydraulic heads, calculation of pore volume flushing, and analysis of solute and isotopic chemistry strongly suggest that the solutes originate from the concentration by evaporation of runoff and potable shallow ground water that discharges from the High Plains aquifer. Chloride/bromide solute ratios, which are thought to be unaffected by mineral precipitation or sorption, average 160
Authors
W. Wood, B.F. Jones
Influence of seasonal growth, age, and environmental exposure on Cu and Ag in a bivalve indicator, Macoma balthica, in San Francisco Bay
Temporal and spatial variations in Cu and Ag in the deposit-feeding clam Macoma balthica and in surficial sediments were analysed at 8 stations in San Francisco Bay at near-monthly intervals for periods ranging from 3 to 10 yr during 1977 to 1986. Strong seasonal variations in metal concentrations of M. balthica were associated with seasonal variations in soft tissue weight. Aperiodic fluctuations
Authors
Daniel J. Cain, Samuel N. Luoma
Enzyme-linked immunosorbent assay compared with gas chromatography/mass spectrometry for the determination of triazine herbicides in water
No abstract available.
Authors
E. Michael Thurman, Michael Meyer, Michael Pomes, Charles A. Perry, A. Paul Schwab
Adsorption of benzene, toluene, and xylene by two tetramethylammonium-smectites having different charge densities
A high-charge smectite from Arizona [cation-exchange capacity (CEC) = 120 meq/100 g] and a low-charge smectite from Wyoming (CEC = 90 meq/100 g) were used to prepare homoionic tetramethylammonium (TMA)-clay complexes. The adsorption of benzene, toluene, and o-xylene as vapors by the dry TMA-clays and as solutes from water by the wet TMA-clays was studied. The adsorption of the organic vapors by th
Authors
Jiunn-Fwu Lee, Max M. Mortland, Cary T. Chiou, Daniel E. Kite, Stephen A. Boyd
Conducting field studies for testing pesticide leaching models
A variety of predictive models are being applied to evaluate the transport and transformation of pesticides in the environment. These include well known models such as the Pesticide Root Zone Model (PRZM), the Risk of Unsaturated-Saturated Transport and Transformation Interactions for Chemical Concentrations Model (RUSTIC) and the Groundwater Loading Effects of Agricultural Management Systems Mode
Authors
Charles N. Smith, Rudolph S. Parrish, David S. Brown
Fluorescent polycyclic aromatic hydrocarbons as probes for studying the impact of colloids on pollutant transport in groundwater
No abstract available.
Authors
Debera A. Backhus, Philip M. Gschwend
Geohydrology and water quality of the Roubidoux Aquifer, northeastern Oklahoma
The Roubidoux aquifer is an important source of freshwater for public supplies, commerce, industry, and rural water districts in northeastern Oklahoma. Ground-water withdrawals from the aquifer in 1981 were estimated to be 4.8 million gallons per day, of which about 90 percent was withdrawn in Ottawa County. Wells drilled at the beginning of the 20th century originally flowed at the land surface,
Authors
Scott C. Christenson, David L. Parkhurst, Roy W. Fairchild
Solid-solution aqueous-solution equilibria: Thermodynamic theory and representation
Thorstenson and Plummer's (1977) "stoichiometric saturation' model is reviewed, and a general relation between stoichiometric saturation Kss constants and excess free energies of mixing is derived for a binary solid-solution B1-xCxA: GE = RT[ln Kss - xln(xKCA) - (l-x)ln((l-x)KBA)]. This equation allows a suitable excess free energy function, such as Guggenheim's (1937) sub-regular function, to be
Authors
P. D. Glynn, E.J. Reardon