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GeoHEALTH-USGS Newsletter

GeoHEALTH-USGS Newsletter

The GeoHEALTH-USGS Newsletter provides information on new USGS science activities related to safeguarding the health of fish, wildlife, domesticated animals, livestock, and people from environmental exposures to contaminants and pathogens.

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Filter Total Items: 3,008
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Year Published: 1983

Complexation of copper by aquatic humic substances from different environments

The copper-complexing properties of aquatic humic substances isolated from eighteen different environments were characterized by potentiometric titration, using a cupric ion selective electrode. Potentiometric data were analyzed using FITEQL, a computer program for the determination of chemical equilibrium constants from experimental data. All the...

McKnight, Diane M.; Feder, Gerald L.; Thurman, E. Michael; Wershaw, Robert L.

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Year Published: 1983

Gas-film coefficients for streams

Equations for predicting the gas-film coefficient for the volatilization of organic solutes from streams are developed. The film coefficient is a function of windspeed and water temperature. The dependence of the coefficient on windspeed is determined from published information on the evaporation of water from a canal. The dependence of the...

Rathbun, R.E.; Tai, D.Y.
Gas-film coefficients for streams; 1983; Article; Journal; Journal of Environmental Engineering; Rathbun, R. E.; Tai, D. Y.

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Year Published: 1983

Kinetic analysis of strontium and potassium sorption onto sands and gravels in a natural channel

A kinetic, first-order mass transfer model was used to describe the sorption of strontium onto sand- and gravel-sized streambed sediments. Rate parameters, empirically determined for strontium, allowed for the prediction of potassium sorption with moderate success. The model parameters varied significantly with particle size. The sorption data...

Bencala, Kenneth E.; Jackman, Alan P.; Kennedy, Vance C.; Avanzino, Ronald J.; Zellweger, Gary W.
Kinetic analysis of strontium and potassium sorption onto sands and gravels in a natural channel.; 1983; Article; Journal; Water Resources Research; Bencala, K. E.; Jackman, A. P.; Kennedy, V. C.; Avanzino, R. J.; Zellweger, G. W.

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Year Published: 1983

Methanogenesis of phenolic compounds by a bacterial consortium from a contaminated aquifer in St. Louis Park, Minnesota

[No abstract available]

Godsy, E.M.; Goerlitz, D.F.; Ehrlich, G.G.
Methanogenesis of phenolic compounds by a bacterial consortium from a contaminated aquifer in St. Louis Park, Minnesota; 1983; Article; Journal; Bulletin of Environmental Contamination and Toxicology; Godsy, E. M.; Goerlitz, D. F.; Ehrlich, G. G.

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Year Published: 1983

Nonequilibrium models for predicting forms of precipitated manganese oxides

Manganese oxides precipitated by bubbling air through 0.01 molar solutions of MnCl2, Mn(NO3)2, MnSO4, or Mn(ClO4)2 at a constantly maintained pH of 8.5 to 9.5 at temperatures of 25??C or higher consisted mainly of hausmannite, Mn3O4. At temperatures near 0??C, but with other conditions the same, the product is feitknechtite, ??MnOOH, except that...

Hem, J.D.; Lind, Carol J.
Nonequilibrium models for predicting forms of precipitated manganese oxides; 1983; Article; Journal; Geochimica et Cosmochimica Acta; Hem, J. D.; Lind, C. J.

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Year Published: 1983

Partition equilibriums of nonionic organic compounds between soil organic matter and water

No abstract available 

Chiou, Cary T.; Porter, Paul E.; Schmedding, David W.

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Year Published: 1983

Requirements for modeling trace metal partitioning in oxidized estuarine sediments

The fate of particulate-bound metals is of particular importance in estuaries because major biological energy flows involve consumption of detrital particles. The biological impact of particulate-bound metals is strongly influenced by the partitioning of metals among sediment components at the oxidized sediment-water interface. Adequate methods...

Luoma, S.N.; Davis, J.A.
Requirements for modeling trace metal partitioning in oxidized estuarine sediments; 1983; Article; Journal; Marine Chemistry; Luoma, S. N.; Davis, J. A.

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Year Published: 1983

Simulation of solute transport in a mountain pool-and-riffle stream with a kinetic mass transfer model for sorption

In natural channels there are often long periods of low flow during which solutes have repeated opportunity for contact with relatively immobile bed materials. Such conditions can exist in very small pool-and-riffle mountain streams. If a solute can sorb onto bed materials, then both hydrodynamic and chemical processes control solute transport. A...

Bencala, Kenneth E.
Simulation of solute transport in a mountain pool-and-riffle stream with a kinetic mass transfer model for sorption.; 1983; Article; Journal; Water Resources Research; Bencala, K. E.

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Year Published: 1983

Simulation of solute transport in a mountain pool-and-riffle stream: A transient storage model

The physical characteristics of mountain streams differ from the uniform and conceptually well- defined open channels for which the analysis of solute transport has been oriented in the past and is now well understood. These physical conditions significantly influence solute transport behavior, as demonstrated by a transient storage model...

Bencala, Kenneth E.; Walters, Roy A.
Simulation of solute transport in a mountain pool-and-riffle stream: a transient storage model.; 1983; Article; Journal; Water Resources Research; Bencala, K. E.; Walters, R. A.

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Year Published: 1983

Terpenoid marker compounds derived from biogenic precursors in volcanic ash from Mount St. Helens, Washington

A volcanic-ash sample obtained after the 1980 eruption of Mount St. Helens, Washington, was analyzed for cyclic terpenoid organic compounds and polycyclic aromatic hydrocarbons using capillary gas chromatography-mass spectrometry-computer techniques. Various tricyclic diterpenoid acids and hydrocarbons were identified including dehydroabietic acid...

Pereira, W.E.; Rostad, C.E.
Terpenoid marker compounds derived from biogenic precursors in volcanic ash from Mount St. Helens, Washington; 1983; Article; Journal; Geochimica et Cosmochimica Acta; Pereira, W. E.; Rostad, C. E.

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Year Published: 1983

Ultrastructural changes in the hepatocytes of juvenile rainbow trout and mature brown trout exposed to copper or zinc

Morphological changes in hepatocytes of mature brown trout (Salmo trutta Linnaeus) and juvenile rainbow trout (Salmo gairdneri Richardson), accompanying chronic exposures to copper and zinc, were examined by transmission electron microscopy. At a concentration of copper not inhibitory to the final stages of gonadal development or spawning of brown...

Leland, H.V.
Ultrastructural changes in the hepatocytes of juvenile rainbow trout and mature brown trout exposed to copper or zinc; 1983; Article; Journal; Environmental Toxicology and Chemistry; Leland, H. V.

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Year Published: 1982

Adsorption of natural dissolved organic matter at the oxide/water interface

Natural organic matter is readily adsorbed by alumina and kaolinite in the pH range of natural waters. Adsorption occurs by complex formation between surface hydroxyls and the acidic functional groups of the organic matter. Oxides with relatively acidic surface hydroxyls, e.g. silica, do not react strongly with the organic matter. Under conditions...

Davis, James A.