Publications
Dive into our publications and explore the science from the Environmental Health Program (Toxic Substances Hydrology and Contaminant Biology).
Filter Total Items: 3787
Heating rates in furnace atomic absorption using the L'vov platform
Heating rate profiles for the furnace tube wall, the furnace atmosphere, and a L'vov platform were established for a range of conditions in a cyclically heated graphite atomizer. The tube wall profile was made by direct observation with a recording optical pyrometer. The sodium line reversal method was used to establish the heating rate of the furnace atmosphere, and appearance temperatures for a
Authors
S.R. Koirtyohann, R.C. Giddings, Howard E. Taylor
Interactions of solutes and streambed sediment: 1. An experimental analysis of cation and anion transport in a mountain stream
An experimental injection was performed to study the transport of stream water solutes under conditions of significant interaction with streambed sediments in a mountain pool-and-riffle stream. Experiments were conducted in Little Lost Man Creek, Humboldt County, California, in a period of low flow duringwhich only a part of the bank-full channel held active surface flow. The injection of chloride
Authors
Kenneth E. Bencala, Vance C. Kennedy, Gary W. Zellweger, Alan P. Jackman, Ronald J. Avanzino
Adsorption of goethite onto quartz and kaolinite
The adsorption of colloidal goethite onto quartz and kaolinite substrates has been studied as a function of pH and NaCl concentration. Goethite adsorption was measured quantitatively by Fourier-transform infrared spectroscopy. The results indicate that adsorption onto both substrates is due primarily to coulombic forces; however, the pH dependence of adsorption is very different for the two substr
Authors
M. C. Goldberg, Eugene R. Weiner, P.M. Boymel
Pore volume determination in activated carbon and coal
No abstract available.
Authors
P.J. Reucroft, K.B. Patel, C. T. Chiou
Volatilization of ketones
Volatilization fluxes of seven ketones were measured over a range of temperatures. Gas-film coefficients were calculated from these volatilization fluxes and related to the gas-film coefficient for the evaporation of water. These relations, when combined with an equation for estimating the gas-film coefficient for evaporation of water from a canal, permit estimating gas-film coefficients for the v
Authors
R. E. Rathbun, D. Y. Tai
Comparison of nonlinear least squares and log transformation procedures for calculating volatilization coefficients
A nonlinear least squares procedure and a log transformation procedure for calculating first-order rate coefficients from experimental concentration-versus-time data were compared using laboratory measurements of the volatilization from water of 1,1,1-trichloroethane and 1,2-dichloroethane and the absorption of oxygen by water. Ratios of the nonlinear least squares to log transformation volatiliza
Authors
R. E. Rathbun, D. Y. Tai
Denitrification in San Francisco Bay intertidal sediments
The acetylene block technique was employed to study denitrification in intertidal estuarine sediments. Addition of nitrate to sediment slurries stimulated denitrification. During the dry season, sediment-slurry denitrification rates displayed Michaelis-Menten kinetics, and ambient NO3− + NO2− concentrations (≤26 μM) were below the apparent Km (50 μM) for nitrate. During the rainy season, when ambi
Authors
Ronald S. Oremland, Cindy Umberger, Charles W. Culbertson, Richard L. Smith
The impact of uncertainties in hydrologic measurement on phosphorus budgets and empirical models for two Colorado reservoirs.
Water budgets and related chemical budgets of aquatic ecosystems commonly are interpreted without reference to uncertainties resulting from errors of measurement. The importance of such uncertainties in the use and interpretation of the phosphorus budgets of two Colorado reservoirs was determined.
Authors
James W. LaBaugh, T. C. Winter
The role of bacterial exopolymer and suspended bacteria in the nutrition of the deposit-feeding clam, Macoma balthica
Significant removal and assimilation of suspended bacteria by M. balthica was observed within two days, although the low clearance rates suggested planktonic bacteria may not be among its major food sources.
Authors
R.W. Harvey, Samuel N. Luoma
Subsurface injection of treated sewage into a saline-water aquifer at St. Petersburg, Florida - Aquifer pressure buildup
The city of St. Petersburg has been testing subsurface injection of treated sewage into the Floridan aquifer as a means of eliminating discharge of sewage to surface waters and as a means of storing treated sewage for future nonpotable reuse. Treated sweage that had a mean chloride concentration of 170 milligrams per liter (mg/l) was injected through a single well for 12 months at a mean rate of 4
Authors
J.J. Hickey
A column technique for determining sorption of organic solutes on the lithological structure of aquifers
No abstract available.
Authors
D.F. Goerlitz
Rhodamine-WT dye losses in a mountain stream environment
A significant fraction of rhodamine WT dye was lost during a short term multitracer injection experiment in a mountain stream environment. The conservative anion chloride and the sorbing cation lithium were concurrently injected. In-stream rhodamine WT concentrations were as low as 45 percent of that expected, based on chloride data. Concentration data were available from shallow‘wells’dug near th
Authors
Kenneth E. Bencala, Ronald E. Rathburn, Alan P. Jackman, Vance C. Kennedy, Gary W. Zellweger, Ronald J. Avanzino