The dissolution of quartz in dilute aqueous solutions of organic acids at 25°C
P.C. Bennett, M.E. Melcer, D. I. Siegel, J.P. Hassett
1988, Geochimica et Cosmochimica Acta (52) 1521-1530
The dissolution of quartz in dilute aqueous solutions of organic acids at 25° and standard pressure was investigated by the batch dissolution method. The bulk dissolution rate of quartz in 20 mmole/Kg citrate solutions at pH 7 was 8 to 10 times faster than that in pure water. After 1750...
Denitrification in a sand and gravel aquifer
R. L. Smith, J.H. Duff
1988, Applied and Environmental Microbiology (54) 1071-1078
Denitrification was assayed by the acetylene blockage technique in slurried core material obtained from a freshwater sand and gravel aquifer. The aquifer, which has been contaminated with treated sewage for more than 50 years, had a contaminant plume greater than 3.5-km long. Near the contaminant source, groundwater nitrate concentrations were...
Arsenic in ground water of the Western United States
Alan H. Welch, Michael S. Lico, Jennifer L. Hughes
1988, Groundwater (26) 333-347
Natural occurrences of ground water with moderate (10 to 50 micrograms per liter) to high (greater than 50 micrograms per liter) concentrations of arsenic are common throughout much of the Western United States. High concentrations of arsenic are generally associated with one of four geochemical environments: (1) basin-fill deposits of...
Iron photoreduction and oxidation in an acidic mountain stream
D.M. McKnight, B. A. Kimball, K.E. Bencala
1988, Science (240) 637-640
In a small mountain stream in Colorado that receives acidic mine drainage, photoreduction of ferric iron results in a well-defined increase in dissolved ferrous iron during the day. To quantify this process, an instream injection of a conservative tracer was used to measure discharge at the time that each sample...
Determining instream flows for flushing of fines and channel maintenance: 1988 Progress Report
Robert T. Milhous
1988, Book, Proceedings of the Eighth Annual AGU Front Range Hydrology Days
No abstract available....
Internal inconsistencies in dispersion-dominated models that incorporate chemical and microbial kinetics
Fred J. Molz, Mark A. Widdowson
1988, Water Resources Research (24) 615-619
Current understanding of transport processes in aquifers is limited by lack of precise point chemical concentration measurements. Recently, however, some careful measurements of vertical chemical concentration profiles have been made at several locations around the world that appear to support a consistent picture concerning the persistence of large vertical concentration...
Discussion of "Flume tests on hydrocarbon reaeration tracer gases"
Ronald E. Rathbun
1988, Journal of Environmental Engineering (114) 473-475
No abstract available....
Use of electrothermal vaporization-multiple-wavelength absorption spectrometry to qualitatively screen for the presence of polycyclic aromatic hydrocarbons
Joseph M. Shekiro, Rodney K. Skogerboe, Howard E. Taylor
1988, Environmental Science & Technology (22) 338-344
No abstract available...
Discussion of "Wind function for a sheltered stream"
R.E. Rathburn
1988, Journal of Environmental Engineering (114) 229-231
No abstract available....
Assessment of the role of bottomland hardwoods in sediment and erosion control
A. Molinas, Gregor T. Auble, C.A. Segelquist, Lee S. Ischinger
1988, Report
Drainage and clearing of bottomland hardwoods have long been recognized by the U.S. Environmental Protection Agency (EPA) and the U.S. Fish and Wildlife Service (Service) as important impacts of Federal water projects in the lower Mississippi River Valley. More recently, the water quality impacts of such projects (e.g., increases in...
Trace contaminants in streams
James S. Kuwabara, P. Helliker
Paul N. Cheremisinoff, editor(s)
1988, Book chapter, Civil engineering practice: Water resources/environmental
No abstract available....
Volcanic Rocks
W.W. Wood, L.A. Fernandez
1988, Book chapter, The geology of North America: Geological Society of America
No abstract available. ...
The biogeochemistry of methanogenic bacteria
Ronald S. Oremland
1988, Book chapter, The biology of microorganisms
No abstract available. ...
Use of "specific" inhibitors in biogeochemistry and microbial ecology
Ronald S. Oremland, D.G. Capone
1988, Book chapter, Advances in microbial ecology
The above statement, although meant to be tongue in cheek, contains an essential truism: all work with inhibitors is inherently suspect. This fact has been known by biochemists for some time. However, use of chemical inhibitors of enzymic systems and membranes continues to be a common approach taken toward unraveling...
Geohydrologic aspects of water-quality problems of the San Joaquin Valley, California
S. J. Deverel
1988, Conference Paper
Salinity and selenium concentrations in shallow ground water of the western San Joaquin Valley, California, are related to the geomorphology and hydrology of the alluvial fans. High salinity and selenium concentrations are associated with ephemeral-stream deposits. Low salinity and selenium concentrations are associated with intermittent-stream deposits, which represent the major...
Assessment of the analytical capabilities of inductively coupled plasma-mass spectrometry
Howard E. Taylor, John R. Garbarino
1988, Journal of Research of the National Bureau of Standards (93) 433-435
A thorough assessment of the analytical capabilities of inductively coupled plasma-mass spectrometry was conducted for selected analytes of importance in water quality applications and hydrologic research. A multielement calibration curve technique was designed to produce accurate and precise results in analysis times of approximately one minute. The suite of elements...
The feasibility of using sequential extraction techniques for As and Se in soils and sediments
Karen A. Gruebel, James A. Davis, James O. Leckie
1988, Soil Science Society of America Journal (52) 390-397
Laboratory experiments were conducted with well-characterized minerals to test the applicability of selective extraction schemes for Se and As partitioning in soils and sediments. Two specific steps were tested: the reductive dissolution of amorphous iron oxides and the oxidation of organic material. Selenium and As associated with amorphous iron oxides...
Regression estimates for topological‐hydrograph input
Michael R. Karlinger, D. Phillip Guertin, Brent M. Troutman
1988, Journal of Water Resources Planning and Management (114) 446-456
Physiographic, hydrologic, and rainfall data from 18 small drainage basins in semiarid, central Wyoming were used to calibrate topological, unit‐hydrograph models for celerity, the average rate of travel of a flood wave through the basin. The data set consisted of basin characteristics and hydrologic data for the 18 basins and...
Groundwater flow and transport modeling
Leonard F. Konikow, J.W. Mercer
1988, Journal of Hydrology (100) 379-409
Deterministic, distributed-parameter, numerical simulation models for analyzing groundwater flow and transport problems have come to be used almost routinely during the past decade. A review of the theoretical basis and practical use of groundwater flow and solute transport models is used to illustrate...
A conceptual framework for assessing cumulative impacts on the hydrology of nontidal wetlands
Thomas C. Winter
1988, Environmental Management (12) 605-620
Wetlands occur in geologic and hydrologic settings that enhance the accumulation or retention of water. Regional slope, local relief, and permeability of the land surface are major controls on the formation of wetlands by surface-water sources. However, these landscape features also have significant control over groundwater flow systems, which commonly...
Photolysis of rhodamine-WT dye
D. Y. Tai, R. E. Rathbun
1988, Chemosphere (17) 559-573
Photolysis of rhodamine-WT dye under natural sunlight conditions was determined by measuring the loss of fluorescence as a function of time. Rate coefficients at 30° north latitude ranged from 4.77 × 10−2 day−1 for summer to 3.16 × 10−2 day−2 for winter. Experimental coefficients were in good agreement with values calculated using a laboratory-determined...
Bacterial ethane formation from reduced, ethylated sulfur compounds in anoxic sediments
R.S. Oremland, Michael J. Whiticar, F.E. Strohmaier, R.P. Kiene
1988, Geochimica et Cosmochimica Acta (52) 1895-1904
Trace levels of ethane were produced biologically in anoxic sediment slurries from five chemically different aquatic environments. Gases from these locations displayed biogenic characteristics, having 12C-enriched values of δ13CH4 (−62 to −86%.), δ13C2H6 (−35 to −55%.) and high ratios (720 to 140,000) of CH4[C2H6+ C3H8]">CH4[C2H6+ C3H8]. Endogenous...
Geochemistry of groundwater in tertiary and cretaceous sediments of the southeastern Coastal Plain in eastern Georgia, South Carolina, and southeastern North Carolina
Roger W. Lee, Donald J. Strickland
1988, Water Resources Research (24) 291-303
Geochemical samples of groundwater taken along hydrologic flow paths in eastern Georgia, South Carolina, and southeastern North Carolina, from noncalcareous sand aquifers, largely of Cretaceous age, are dominated by sodium and bicarbonate ions. Calcareous sand aquifers, largely of Tertiary age, contain water whose chemistry is dominated by calcium and bicarbonate...
Accumulation and bioconcentration of polycyclic aromatic hydrocarbons in a nearshore estuarine environment near a Pensacola (Florida) creosote contamination site
J. F. Elder, P.V. Dresler
1988, Environmental Pollution (49) 117-132
Long-term accumulation of creosote wastes at a wood-preserving facility near Pensacola, Florida, has produced high levels of organic contamination of groundwaters near Pensacola Bay. Impacts of this contamination on the nearshore environment of the bay were examined by analysis of water, sediment and tissues of two mollusc species. One of...
Fate of acetone in an outdoor model stream in southern Mississippi, U.S.A.
R. E. Rathbun, D. W. Stephens, D.J. Shultz, D. Y. Tai
1988, Journal of Hydrology (104) 181-209
The fate of acetone in water was investigated in an outdoor model stream located in southern Mississippi, U.S.A. Acetone was injected continuously for 32 days resulting in small milligram-perliter concentrations in the stream. Rhodamine-WT dye was injected at the beginning and at the end of the study to determine the...
