Allan Kolker (Former Employee)
Science and Products
Filter Total Items: 51
Chemical analysis and modes of occurrence of selected trace elements in a coal sample from eastern Kentucky coal bed: White Creek Mine, Martin County, Kentucky
No abstract available.
Authors
Curtis A. Palmer, Kris Dennen, Allan Kolker, Robert F. Finkelman, John H. Bullock
Toxic substances from coal combustion - A comprehensive assessment, phase II: Element modes of occurrence for the Ohio 5/6/7, Wyodak, and North Dakota coal samples
No abstract available.
Authors
Allan Kolker, Stanley J. Mroczkowski, Curtis A. Palmer, Kristen O. Dennen, Robert B. Finkelman, John H. Bullock
Chemical analysis and modes of occurrence of selected trace elements in a Powder River basin coal and its corresponding simulated cleaned coal
This report provides semi-quantitative data on modes of occurrence of 19 elements in as-mined Powder River Basin coal and its corresponding simulated cleaned coal. The data are in support of the project "Prediction of Trace Element Removal from Coal" --a Cooperative Research and Development Agreement (CRADA) with CQ Inc. The purpose of this CRADA is to apply modes of occurrence information to coal
Authors
Curtis A. Palmer, Stanley J. Mroczkowski, Allan Kolker, Robert B. Finkelman, John H. Bullock
Determination of element affinities by density fractionation of bulk coal samples
A review has been made of the various methods of determining major and trace element affinities for different phases, both mineral and organic in coals, citing their various strengths and weaknesses. These include mathematical deconvolution of chemical analyses, direct microanalysis, sequential extraction procedures and density fractionation. A new methodology combining density fractionation with
Authors
X. Querol, Z. Klika, Z. Weiss, R. B. Finkelman, A. Alastuey, R. Juan, A. Lopez-Soler, F. Plana, A. Kolker, S.R.N. Chenery
Direct comparison of XAFS spectroscopy and sequential extraction for arsenic speciation in coal
The speciation of arsenic in an Ohio bituminous coal and a North Dakota lignite has been examined by the complementary methods of arsenic XAFS spectroscopy and sequential extraction by aqueous solutions of ammonium acetate, HCl, HF, and HNO3. In order to facilitate a more direct comparison of the two methods, the arsenic XAFS spectra were obtained from aliquots of the coal prepared after each stag
Authors
Frank E. Huggins, G.P. Huffman, A. Kolker, S. Mroczkowski, C.A. Palmer, R. B. Finkelman
Stanford-USGS shrimp-RG ion microprobe: A new approach to determining the distribution of trace elements in coal
The distribution of Cr and other trace metals of environmental interest in a range of widely used U.S. coals was investigated using the Stanford-USGS SHRIMP-RG ion microprobe . Using the oxygen ion source, concentrations of Cr (11 to 176 ppm), V (23 to 248 ppm), Mn (2 to 149 ppm), Ni (2 to 30 ppm), and 13 other elements were determined in illite/smectite, a group of clay minerals commonly present
Authors
A. Kolker, J. L. Wooden, H.M. Persing, R. A. Zielinski
Mode of occurrence of arsenic in four US coals
An integrated analytical approach has been used to determine the mode of occurrence of arsenic in samples of four widely used US coals: the Pittsburgh, Illinois #6, Elkhorn/Hazard, and Wyodak. Results from selective leaching, X-ray absorption fine structure (XAFS) spectroscopy, and electron microprobe analysis show that pyrite is the principal source of arsenic in the three bituminous coals, but t
Authors
A. Kolker, Frank E. Huggins, C.A. Palmer, N. Shah, S.S. Crowley, G.P. Huffman, R. B. Finkelman
Distribution of trace elements in selected pulverized coals as a function of particle size and density
Trace elements in coal have diverse modes of occurrence that will greatly influence their behavior in many coal utilization processes. Mode of occurrence is important in determining the partitioning during coal cleaning by conventional processes, the susceptibility to oxidation upon exposure to air, as well as the changes in physical properties upon heating. In this study, three complementary meth
Authors
C.L. Senior, T. Zeng, J. Che, M.R. Ames, A.F. Sarofim, I. Olmez, Frank E. Huggins, N. Shah, G.P. Huffman, A. Kolker, S. Mroczkowski, C. Palmer, R. Finkelman
Mode of occurrence of chromium in four US coals
The mode of occurrence of chromium in three US bituminous coals and one US subbituminous has been examined using both X-ray absorption fine structure (XAFS) spectroscopy and a selective leaching protocol supplemented by scanning electron microscopy (SEM) and electron microprobe measurements. A synthesis of results from both methods indicates that chromium occurs principally in two forms in the bit
Authors
Frank E. Huggins, N. Shah, G.P. Huffman, A. Kolker, S. Crowley, C.A. Palmer, R. B. Finkelman
Semi-quantitative determination of the modes of occurrence of elements in coal: Results from an international round robin project
No abstract available.
Authors
Jason C. Willett, Robert B. Finkelman, Stanley J. Mroczkowski, Curtis A. Palmer, Allan Kolker
Preliminary report on the International Energy Agency mode of occurrence inter-laboratory comparison; Phase I, USGS results
No abstract available.
Authors
Curtis A. Palmer, Allan Kolker, Jason C. Willett, Stanley J. Mroczkowski, Robert B. Finkelman, K.C. Taylor, F.T. Dulong, J. H. Bullock
Characterization of fly ash from low-sulfur and high-sulfur coal sources: Partitioning of carbon and trace elements with particle size
Fly ash samples were collected in November and December of 1994, from generating units at a Kentucky power station using high- and low-sulfur feed coals. The samples are part of a two-year study of the coal and coal combustion byproducts from the power station. The ashes were wet screened at 100, 200, 325, and 500 mesh (150, 75, 42, and 25 mu m, respectively). The size fractions were then dried, w
Authors
James C. Hower, A.S. Trimble, Cortland F. Eble, Curtis A. Palmer, Allan Kolker
Non-USGS Publications**
Huggins, F. E., Huffman, G. P., Kolker, Allan, Mroczkowski, S. J., Palmer, C. A., and Finkelman, R. B., 2002, Combined application of XAFS spectroscopy and sequential leaching for determination of arsenic speciation in coal: Energy and Fuels, v. 16, no. 5, p. 1167-1172.
Bunnell, J. E., Garcia, L. V., Furst, J. M., Lerch, Harry, Olea, R.A., Suitt, S.E., and Kolker, Allan, 2010, Navajo coal combustion and respiratory health near Shiprock, New Mexico: Journal of Environmental and Public Health, v. 2010, #260525, 14 p.
Engle, Mark A., Radke, Lawrence F., Heffern, Edward L., O’Keefe, Jennifer M.K., Hower, James C., Smeltzer, Charles D., Hower, Judith M, Olea, Ricardo A., Eatwell, Robert J., Blake, Donald R., Emsbo-Mattingly, Stephen D., Stout, Scott A., Queen, Gerald, Aggen, Kerry L., Kolker, Allan, Prakash, Anupma, Henke, Kevin R., Stracher, Glenn B., Schroeder, Paul A., Román-Colón, Yomayra, and ter Schure, Arnout, 2012, Gas emissions, minerals, and tars associated with three coal fires, Powder River Basin, USA: Science of the Total Environment, v. 420, p. 146-159.
Kolker, Allan, Engle, Mark A., Peuker-Ehrenbrink, Bernhard, Geboy, N. J., Krabbenhoft, D.P., Bothner, M.H., and Tate, M.T., Atmospheric mercury and fine particulate matter at Woods Hole, Cape Cod, MA: Implications for mercury and trace element sources in the northeastern U.S.: Atmospheric Environment, v. 79, p. 760-768.
Kolker, Allan, and Quick, Jeffrey C., 2015, Mercury and halogens in coal, in, Granite, E., Senior, C., and Pennline, H., eds., Mercury control for coal-derived gas steams, Wiley-VCH, p. 13-44.
Kolker, Allan, 2016, Mercury in U.S. Coal- Priorities for New USGS Studies: U.S. Geological Survey Open File Report, in press.
Deonarine, A., Kolker, A., Doughten, M., Bailoo, J.D., and Holland, J.T., Arsenic speciation in bituminous coal fly ash and transformations in response to redox conditions: Submitted to Environmental Science and Technology.
Deonarine, A., Kolker, A., Doughten, M., Bailoo, J.D., and Holland, J.T., Arsenic speciation in bituminous coal fly ash and transformations in response to redox conditions: Submitted to Environmental Science and Technology.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Filter Total Items: 51
Chemical analysis and modes of occurrence of selected trace elements in a coal sample from eastern Kentucky coal bed: White Creek Mine, Martin County, Kentucky
No abstract available.
Authors
Curtis A. Palmer, Kris Dennen, Allan Kolker, Robert F. Finkelman, John H. Bullock
Toxic substances from coal combustion - A comprehensive assessment, phase II: Element modes of occurrence for the Ohio 5/6/7, Wyodak, and North Dakota coal samples
No abstract available.
Authors
Allan Kolker, Stanley J. Mroczkowski, Curtis A. Palmer, Kristen O. Dennen, Robert B. Finkelman, John H. Bullock
Chemical analysis and modes of occurrence of selected trace elements in a Powder River basin coal and its corresponding simulated cleaned coal
This report provides semi-quantitative data on modes of occurrence of 19 elements in as-mined Powder River Basin coal and its corresponding simulated cleaned coal. The data are in support of the project "Prediction of Trace Element Removal from Coal" --a Cooperative Research and Development Agreement (CRADA) with CQ Inc. The purpose of this CRADA is to apply modes of occurrence information to coal
Authors
Curtis A. Palmer, Stanley J. Mroczkowski, Allan Kolker, Robert B. Finkelman, John H. Bullock
Determination of element affinities by density fractionation of bulk coal samples
A review has been made of the various methods of determining major and trace element affinities for different phases, both mineral and organic in coals, citing their various strengths and weaknesses. These include mathematical deconvolution of chemical analyses, direct microanalysis, sequential extraction procedures and density fractionation. A new methodology combining density fractionation with
Authors
X. Querol, Z. Klika, Z. Weiss, R. B. Finkelman, A. Alastuey, R. Juan, A. Lopez-Soler, F. Plana, A. Kolker, S.R.N. Chenery
Direct comparison of XAFS spectroscopy and sequential extraction for arsenic speciation in coal
The speciation of arsenic in an Ohio bituminous coal and a North Dakota lignite has been examined by the complementary methods of arsenic XAFS spectroscopy and sequential extraction by aqueous solutions of ammonium acetate, HCl, HF, and HNO3. In order to facilitate a more direct comparison of the two methods, the arsenic XAFS spectra were obtained from aliquots of the coal prepared after each stag
Authors
Frank E. Huggins, G.P. Huffman, A. Kolker, S. Mroczkowski, C.A. Palmer, R. B. Finkelman
Stanford-USGS shrimp-RG ion microprobe: A new approach to determining the distribution of trace elements in coal
The distribution of Cr and other trace metals of environmental interest in a range of widely used U.S. coals was investigated using the Stanford-USGS SHRIMP-RG ion microprobe . Using the oxygen ion source, concentrations of Cr (11 to 176 ppm), V (23 to 248 ppm), Mn (2 to 149 ppm), Ni (2 to 30 ppm), and 13 other elements were determined in illite/smectite, a group of clay minerals commonly present
Authors
A. Kolker, J. L. Wooden, H.M. Persing, R. A. Zielinski
Mode of occurrence of arsenic in four US coals
An integrated analytical approach has been used to determine the mode of occurrence of arsenic in samples of four widely used US coals: the Pittsburgh, Illinois #6, Elkhorn/Hazard, and Wyodak. Results from selective leaching, X-ray absorption fine structure (XAFS) spectroscopy, and electron microprobe analysis show that pyrite is the principal source of arsenic in the three bituminous coals, but t
Authors
A. Kolker, Frank E. Huggins, C.A. Palmer, N. Shah, S.S. Crowley, G.P. Huffman, R. B. Finkelman
Distribution of trace elements in selected pulverized coals as a function of particle size and density
Trace elements in coal have diverse modes of occurrence that will greatly influence their behavior in many coal utilization processes. Mode of occurrence is important in determining the partitioning during coal cleaning by conventional processes, the susceptibility to oxidation upon exposure to air, as well as the changes in physical properties upon heating. In this study, three complementary meth
Authors
C.L. Senior, T. Zeng, J. Che, M.R. Ames, A.F. Sarofim, I. Olmez, Frank E. Huggins, N. Shah, G.P. Huffman, A. Kolker, S. Mroczkowski, C. Palmer, R. Finkelman
Mode of occurrence of chromium in four US coals
The mode of occurrence of chromium in three US bituminous coals and one US subbituminous has been examined using both X-ray absorption fine structure (XAFS) spectroscopy and a selective leaching protocol supplemented by scanning electron microscopy (SEM) and electron microprobe measurements. A synthesis of results from both methods indicates that chromium occurs principally in two forms in the bit
Authors
Frank E. Huggins, N. Shah, G.P. Huffman, A. Kolker, S. Crowley, C.A. Palmer, R. B. Finkelman
Semi-quantitative determination of the modes of occurrence of elements in coal: Results from an international round robin project
No abstract available.
Authors
Jason C. Willett, Robert B. Finkelman, Stanley J. Mroczkowski, Curtis A. Palmer, Allan Kolker
Preliminary report on the International Energy Agency mode of occurrence inter-laboratory comparison; Phase I, USGS results
No abstract available.
Authors
Curtis A. Palmer, Allan Kolker, Jason C. Willett, Stanley J. Mroczkowski, Robert B. Finkelman, K.C. Taylor, F.T. Dulong, J. H. Bullock
Characterization of fly ash from low-sulfur and high-sulfur coal sources: Partitioning of carbon and trace elements with particle size
Fly ash samples were collected in November and December of 1994, from generating units at a Kentucky power station using high- and low-sulfur feed coals. The samples are part of a two-year study of the coal and coal combustion byproducts from the power station. The ashes were wet screened at 100, 200, 325, and 500 mesh (150, 75, 42, and 25 mu m, respectively). The size fractions were then dried, w
Authors
James C. Hower, A.S. Trimble, Cortland F. Eble, Curtis A. Palmer, Allan Kolker
Non-USGS Publications**
Huggins, F. E., Huffman, G. P., Kolker, Allan, Mroczkowski, S. J., Palmer, C. A., and Finkelman, R. B., 2002, Combined application of XAFS spectroscopy and sequential leaching for determination of arsenic speciation in coal: Energy and Fuels, v. 16, no. 5, p. 1167-1172.
Bunnell, J. E., Garcia, L. V., Furst, J. M., Lerch, Harry, Olea, R.A., Suitt, S.E., and Kolker, Allan, 2010, Navajo coal combustion and respiratory health near Shiprock, New Mexico: Journal of Environmental and Public Health, v. 2010, #260525, 14 p.
Engle, Mark A., Radke, Lawrence F., Heffern, Edward L., O’Keefe, Jennifer M.K., Hower, James C., Smeltzer, Charles D., Hower, Judith M, Olea, Ricardo A., Eatwell, Robert J., Blake, Donald R., Emsbo-Mattingly, Stephen D., Stout, Scott A., Queen, Gerald, Aggen, Kerry L., Kolker, Allan, Prakash, Anupma, Henke, Kevin R., Stracher, Glenn B., Schroeder, Paul A., Román-Colón, Yomayra, and ter Schure, Arnout, 2012, Gas emissions, minerals, and tars associated with three coal fires, Powder River Basin, USA: Science of the Total Environment, v. 420, p. 146-159.
Kolker, Allan, Engle, Mark A., Peuker-Ehrenbrink, Bernhard, Geboy, N. J., Krabbenhoft, D.P., Bothner, M.H., and Tate, M.T., Atmospheric mercury and fine particulate matter at Woods Hole, Cape Cod, MA: Implications for mercury and trace element sources in the northeastern U.S.: Atmospheric Environment, v. 79, p. 760-768.
Kolker, Allan, and Quick, Jeffrey C., 2015, Mercury and halogens in coal, in, Granite, E., Senior, C., and Pennline, H., eds., Mercury control for coal-derived gas steams, Wiley-VCH, p. 13-44.
Kolker, Allan, 2016, Mercury in U.S. Coal- Priorities for New USGS Studies: U.S. Geological Survey Open File Report, in press.
Deonarine, A., Kolker, A., Doughten, M., Bailoo, J.D., and Holland, J.T., Arsenic speciation in bituminous coal fly ash and transformations in response to redox conditions: Submitted to Environmental Science and Technology.
Deonarine, A., Kolker, A., Doughten, M., Bailoo, J.D., and Holland, J.T., Arsenic speciation in bituminous coal fly ash and transformations in response to redox conditions: Submitted to Environmental Science and Technology.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.