William H. Orem, Ph.D.
William Orem (Bill), Ph.D. is a Supervisory Research Chemist (Geochemist) and Principal Investigator with the USGS Geology, Energy & Minerals (GEM) Science Center in Reston, VA.
Professional Experience
Research Chemist, U.S. Geological Survey (1984-present)
Adjunct Faculty, University of Maryland, Department of Geology (1982-1992)
National Research Council Postdoctoral Associate (1982-1984)
Education and Certifications
B.S. Chemistry, Lehigh University
M.S. Oceanography, University of Delaware
Ph.D. Chemistry, University of New Hampshire
Science and Products
Filter Total Items: 129
Organic geochemistry and brine composition in Great Salt, Mono, and Walker Lakes
Samples of Recent sediments, representing up to 1000 years of accumulation, were collected from three closed basin lakes (Mono Lake, CA, Walker Lake, NV, and Great Salt Lake, UT) to assess the effects of brine composition on the accumulation of total organic carbon, the concentration of dissolved organic carbon, humic acid structure and diagenesis, and trace metal complexation.The Great Salt Lake
Authors
Joseph L. Domagalski, W. H. Orem, H.P. Eugster
Solid-state 13C NMR studies of dissolved organic matter in pore waters from different depositional environments
Dissolved organic matter (DOM) in pore waters from sediments of a number of different depositional environments was isolated by ultrafiltration using membranes with a nominal molecular weight cutoff of 500. This > 500 molecular weight DOM represents 70-98% of the total DOM in these pore waters. We determined the gross chemical structure of this material using both solid-state 13C nuclear magnetic
Authors
W. H. Orem, Patrick G. Hatcher
Early diagenesis of organic matter in a Sawgrass peat from the Everglades, Florida
The transformation of plant biopolymers to humic substances in peats during early diagenesis is a critical but poorly understood step in the formation of coal. This paper presents results concerning the structural interrelationships among various fractions of the organic matter in peat and the dissolved organic matter in the pore water from a site in The Everglades, relying primarily on elemental
Authors
W. H. Orem, Patrick G. Hatcher
Dissolved organic matter in anoxic pore waters from Mangrove Lake, Bermuda
Dissolved organic matter and dissolved inorganic chemical species in anoxic pore water from Mangrove Lake, Bermuda sediments were studied to evaluate the role of pore water in the early diagenesis of organic matter. Dissolved sulphate, titration alkalinity, phosphate, and ammonia concentration versus depth profiles were typical of many nearshore clastic sediments and indicated sulphate reduction i
Authors
W. H. Orem, Patrick G. Hatcher, E.C. Spiker, N.M. Szeverenyi, G.E. Maciel
Geologic processes affecting the quality of the Upper Freeport coal bed, west-central Pennsylvania
No abstract available.
Authors
R.W. Stanton, C. B. Cecil, B.S. Pierce, L.F. Ruppert, F.T. Dulong
Paleoclimate controls on late paleozoic sedimentation and peat formation in the central appalachian basin (U.S.A.)
In the central Appalachian basin, at least two major climate changes affected sedimentation during the late Paleozoic. Stratigraphically, these two changes are indicated by the distribution of coal beds, the variation in coal quality, and the variation in rock lithologies. In latest Mississippian or earliest Pennsylvanian time, the climate changed from dry-seasonal tropical to ever-wet (equable) t
Authors
C. B. Cecil, R.W. Stanton, S.G. Neuzil, F.T. Dulong, L.F. Ruppert, B.S. Pierce
GEOLOGIC PROCESSES AFFECTING THE QUALITY OF THE UPPER FREEPORT COAL BED, WEST-CENTRAL PENNSYLVANIA.
The number or types of origins of the components of a coal bed cannot be determined from its bulk composition. Minerals such as quartz, calcite, and pyrite as well as macerals such as vitrinite can originate from a variety of processes that result from different depositional conditions. The Upper Freeport coal bed was studied and characterized by sampling and analyzing its mappable subunits (facie
Authors
R.W. Stanton, C. B. Cecil, B.S. Pierce, L.F. Ruppert, F.T. Dulong
Descriptions and correlations of coal bed facies, Lower Freeport(?) coal bed, west-central Pennsylvania
No abstract available.
Authors
R.W. Stanton, B.S. Pierce, T.A. Moore, L.F. Ruppert
MICROCHARACTERIZATION OF ARSENIC- AND SELENIUM-BEARING PYRITE IN UPPER FREEPORT COAL, INDIANA COUNTY, PENNSYLVANIA.
Optical and scanning electron microscope as well as electron and proton microprobe techniques have been used in a detailed investigation of the modes of occurrence of arsenic and selenium in pyrite in Upper Freeport coal from the Homer City area, Indiana County, Pennsylvania. Polished blocks were prepared from columnar samples of the coal bed to represent particular zones continuously from top to
Authors
J.A. Minkin, R. B. Finkelman, C.L. Thompson, E. C. T. Chao, L.F. Ruppert, H. Blank, C. B. Cecil
Science and Products
Filter Total Items: 129
Organic geochemistry and brine composition in Great Salt, Mono, and Walker Lakes
Samples of Recent sediments, representing up to 1000 years of accumulation, were collected from three closed basin lakes (Mono Lake, CA, Walker Lake, NV, and Great Salt Lake, UT) to assess the effects of brine composition on the accumulation of total organic carbon, the concentration of dissolved organic carbon, humic acid structure and diagenesis, and trace metal complexation.The Great Salt Lake
Authors
Joseph L. Domagalski, W. H. Orem, H.P. Eugster
Solid-state 13C NMR studies of dissolved organic matter in pore waters from different depositional environments
Dissolved organic matter (DOM) in pore waters from sediments of a number of different depositional environments was isolated by ultrafiltration using membranes with a nominal molecular weight cutoff of 500. This > 500 molecular weight DOM represents 70-98% of the total DOM in these pore waters. We determined the gross chemical structure of this material using both solid-state 13C nuclear magnetic
Authors
W. H. Orem, Patrick G. Hatcher
Early diagenesis of organic matter in a Sawgrass peat from the Everglades, Florida
The transformation of plant biopolymers to humic substances in peats during early diagenesis is a critical but poorly understood step in the formation of coal. This paper presents results concerning the structural interrelationships among various fractions of the organic matter in peat and the dissolved organic matter in the pore water from a site in The Everglades, relying primarily on elemental
Authors
W. H. Orem, Patrick G. Hatcher
Dissolved organic matter in anoxic pore waters from Mangrove Lake, Bermuda
Dissolved organic matter and dissolved inorganic chemical species in anoxic pore water from Mangrove Lake, Bermuda sediments were studied to evaluate the role of pore water in the early diagenesis of organic matter. Dissolved sulphate, titration alkalinity, phosphate, and ammonia concentration versus depth profiles were typical of many nearshore clastic sediments and indicated sulphate reduction i
Authors
W. H. Orem, Patrick G. Hatcher, E.C. Spiker, N.M. Szeverenyi, G.E. Maciel
Geologic processes affecting the quality of the Upper Freeport coal bed, west-central Pennsylvania
No abstract available.
Authors
R.W. Stanton, C. B. Cecil, B.S. Pierce, L.F. Ruppert, F.T. Dulong
Paleoclimate controls on late paleozoic sedimentation and peat formation in the central appalachian basin (U.S.A.)
In the central Appalachian basin, at least two major climate changes affected sedimentation during the late Paleozoic. Stratigraphically, these two changes are indicated by the distribution of coal beds, the variation in coal quality, and the variation in rock lithologies. In latest Mississippian or earliest Pennsylvanian time, the climate changed from dry-seasonal tropical to ever-wet (equable) t
Authors
C. B. Cecil, R.W. Stanton, S.G. Neuzil, F.T. Dulong, L.F. Ruppert, B.S. Pierce
GEOLOGIC PROCESSES AFFECTING THE QUALITY OF THE UPPER FREEPORT COAL BED, WEST-CENTRAL PENNSYLVANIA.
The number or types of origins of the components of a coal bed cannot be determined from its bulk composition. Minerals such as quartz, calcite, and pyrite as well as macerals such as vitrinite can originate from a variety of processes that result from different depositional conditions. The Upper Freeport coal bed was studied and characterized by sampling and analyzing its mappable subunits (facie
Authors
R.W. Stanton, C. B. Cecil, B.S. Pierce, L.F. Ruppert, F.T. Dulong
Descriptions and correlations of coal bed facies, Lower Freeport(?) coal bed, west-central Pennsylvania
No abstract available.
Authors
R.W. Stanton, B.S. Pierce, T.A. Moore, L.F. Ruppert
MICROCHARACTERIZATION OF ARSENIC- AND SELENIUM-BEARING PYRITE IN UPPER FREEPORT COAL, INDIANA COUNTY, PENNSYLVANIA.
Optical and scanning electron microscope as well as electron and proton microprobe techniques have been used in a detailed investigation of the modes of occurrence of arsenic and selenium in pyrite in Upper Freeport coal from the Homer City area, Indiana County, Pennsylvania. Polished blocks were prepared from columnar samples of the coal bed to represent particular zones continuously from top to
Authors
J.A. Minkin, R. B. Finkelman, C.L. Thompson, E. C. T. Chao, L.F. Ruppert, H. Blank, C. B. Cecil