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GeoHEALTH-USGS Newsletter

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January 1, 1991

MBSSAS: A code for the computation of margules parameters and equilibrium relations in binary solid-solution aqueous-solution systems

The computer code MBSSAS uses two-parameter Margules-type excess-free-energy of mixing equations to calculate thermodynamic equilibrium, pure-phase saturation, and stoichiometric saturation states in binary solid-solution aqueous-solution (SSAS) systems. Lippmann phase diagrams, Roozeboom diagrams, and distribution-coefficient diagrams can be constructed from the output data files, and also can be

Authors

P. D. Glynn

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1991

Selectivity and effectiveness of extractants used to release metals associated with organic matter

Partial extraction procedures can be used to release metals associated with organic matter in natural materials. Reagents commonly employed for this purpose include hydrogen peroxide, Na hypochlorite and Na pyrophosphate. This study tested the selectivity of these reagents by comparing the amount of Fe, Mn, Zn and Cu they released from sulfide and oxide minerals and determined the ability of these

Authors

C.S.E. Papp, L.H. Filipek, K. S. Smith

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1991

Coprecipitation mechanisms and products in manganese oxidation in the presence of cadmium

Manganese oxidation products were precipitated in an aerated open-aqueous system where a continuous influx of mixed Mn2+ and Cd2+ solution was supplied and pH was maintained with an automated pH-stat adding dilute NaOH. X-ray diffraction and electron diffraction identified the solids produced as mixtures of Cd2Mn34+O8, Mn2+2Mn4+3O8, MnO2 (ramsdellite), and CdCO3. Mean oxidation numbers of the tota

Authors

J. D. Hem, Carol J. Lind

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1991

Movement and fate of agricultural chemicals in the surface and subsurface environments near Plains, southwestern Georgia: Integrated work plan

No abstract available.

Authors

D.W. Hicks, J. B. McConnell, L.E. Asmussen, R.A. Leonard, C.N. Smith

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1991

Plan to evaluate the effects of hydrogeologic conditions and human activities on water quality in the coastal plain of New York and New Jersey

No abstract available.

Authors

E. F. Vowinkel, S. F. Siwiec

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1991

Reconnaissance investigation of water quality, bottom sediment, and biota associated with irrigation drainage in the Klamath Basin, California and Oregon, 1988-89

No abstract available.

Authors

S. K. Sorenson, S.E. Schwarzbach

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1991

Time-courses in the retention of food material in the bivalves Potamocorbula amurensis and Macoma balthica significance to the absorption of carbon and chromium

Time courses for ingestion, retention and release via feces of microbial food was investigated using 2 bivalves with different feeding strategies, Potamocorbula amurensis and Macoma balthica. The results showed 2 pathways for the uptake of food material in these clams. The first is represented by an initial label pulse in the feces. The second pathway operates over longer time periods. Inert 51Cr-

Authors

Alan W. Decho, Samuel N. Luoma

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1991

Convergent radial dispersion: A note on evaluation of the Laplace transform solution

A numerical inversion algorithm for Laplace transforms that is capable of handling rapid changes in the computed function is applied to the Laplace transform solution to the problem of convergent radial dispersion in a homogeneous aquifer. Prior attempts by the author to invert this solution were unsuccessful for highly advective systems where the Peclet number was relatively large. The algorithm

Authors

Allen F. Moench

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1991

Water-extractable geochemical data for native and irrigated soils from the Kendrick Reclamation Project Area, Wyoming, 1988-89

No abstract available.

Authors

J. G. Crock, R. C. Severson, James A. Erdman

Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Wyoming-Montana Water Science Center

January 1, 1991

User's manual for WATEQ4F, with revised thermodynamic data base and text cases for calculating speciation of major, trace, and redox elements in natural waters

No abstract available.

Authors

J. W. Ball, D. Kirk Nordstrom

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1991

Uptake and physiological antagonism of selenium and sulfur in alfalfa and wheat under field conditions, San Joaquin Valley, California

No abstract available.

Authors

R. C. Severson, L. P. Gough, J. G. Crock, D. L. Fey, P. L. Hageman, A.H. Love, T.R. Peacock

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

January 1, 1991

Trace metals in clams (Macoma Balthica) and sediments at the Palo Alto mudflat in south San Francisco Bay: April, 1990 - April, 1991

No abstract available.

Authors

Samuel N. Luoma, Daniel J. Cain, Cynthia Brown, Ellen V. Axtmann

Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program

Publications

GeoHEALTH-USGS Newsletter

Featured Science Activities

MBSSAS: A code for the computation of margules parameters and equilibrium relations in binary solid-solution aqueous-solution systems

Selectivity and effectiveness of extractants used to release metals associated with organic matter

Coprecipitation mechanisms and products in manganese oxidation in the presence of cadmium

Movement and fate of agricultural chemicals in the surface and subsurface environments near Plains, southwestern Georgia: Integrated work plan

Plan to evaluate the effects of hydrogeologic conditions and human activities on water quality in the coastal plain of New York and New Jersey

Reconnaissance investigation of water quality, bottom sediment, and biota associated with irrigation drainage in the Klamath Basin, California and Oregon, 1988-89

Time-courses in the retention of food material in the bivalves Potamocorbula amurensis and Macoma balthica significance to the absorption of carbon and chromium

Convergent radial dispersion: A note on evaluation of the Laplace transform solution

Water-extractable geochemical data for native and irrigated soils from the Kendrick Reclamation Project Area, Wyoming, 1988-89

User's manual for WATEQ4F, with revised thermodynamic data base and text cases for calculating speciation of major, trace, and redox elements in natural waters

Uptake and physiological antagonism of selenium and sulfur in alfalfa and wheat under field conditions, San Joaquin Valley, California

Trace metals in clams (Macoma Balthica) and sediments at the Palo Alto mudflat in south San Francisco Bay: April, 1990 - April, 1991

U.S. Geological Survey

U.S. Department of the Interior