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Chemistry

Analytical chemistry

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Displaying 1951 - 1975 of 2098

Capillary Supercritical Fluid Chromatography of Explosives: Investigations on the Interactions Between the Analytes, the Mobile Phase, and the Stationary Phase

November 14, 1990

Author(s)

A. Munder, S. N. Chesler, Stephen Wise

Mass spectra of 10,10-dimethyl-9,10-dihydro-10-sila-2-azaanthracenes with heterocyclic substituents at C-9

September 1, 1990

Author(s)

Anzor Mikaia, Victor Shevtsov, Sergei Poshivalov, Alexey V. Varlamov

Major fragmentation of dihydrosilaazaanthracenes, contammg an azetidine substituent, spiro-3-lactam ring, or spirotetrahydrofuryl residue at C9 upon electron impact are due to the presence of these rings. The azetidine ring may be eliminated as a radical

Polycyclic Aromatic Hydrocarbon Emissions from the Combustion of Crude Oil on Water

September 1, 1990

Author(s)

Bruce A. Benner Jr, Nelson P. Bryner, Stephen A. Wise, George W. Mulholland, R. Lao, M. F. Fingas

Synthesis and properties of azoles and their derivatives.25. Electron impact mass spectra of nitro- and nitroalkyl-substituted 3-aryl-isoxazolines.

September 1, 1990

Author(s)

Anzor Mikaia, Andre Baranski

It is determined that dissociation of molecular ions of aryl-isoxazolines under electron ionization takes place primarily through the nitro- and halogen-containing groups. Detailed analysis of the most important fragmentation pathways are presented

Electron impact mass spectra of substituted b-nitrostyrenes

August 1, 1990

Author(s)

Anzor Mikaia, Andre Baranski

Peaks of characteristic ions in the electron ionization mass spectra of substituted β-nitrostyrenes are identified, and mechanisms of their formation are determined

Alaskan Marine Mammal Tissue Archival Project

July 1, 1990

Author(s)

Paul R. Becker, B. J. Koster, Stephen A. Wise, Rolf L. Zeisler

The Anomalous Behavior of Selected Methyl-Substituted Polycyclic Aromatic Hydrocarbons in Reversed-Phase Liquid Chromatography

July 1, 1990

Author(s)

Stephen A. Wise, Lane C. Sander, R. Lapouyade, P. Garrigues

14 C Source Apportionment Technique Applied to Wintertime Urban Aerosols and Gases for the EPA Integrated Air Cancer Project

June 1, 1990

Author(s)

George A. Klouda, Lloyd A. Currie, A. E. Sheffield, B, I. Diamondstone, Bruce A. Benner Jr., Stephen Wise, R. K. Stevens, R. G. Merrill

Characterization of Chemically Modified Pore Surfaces by Small Angle Neutron Scattering

June 1, 1990

Author(s)

C. J. Glinka, Lane C. Sander, Stephen Wise, N. F. Berk

Determination of Bonded Phase Thickness in Liquid Chromatography by Small Angle Scattering

May 1, 1990

Author(s)

Lane C. Sander, Charles J. Glinka, Stephen A. Wise

Evaluation of Column Selectivity in Liquid Chromatography

April 1, 1990

Author(s)

Lane C. Sander, Stephen A. Wise

Determination of Methylbenzo[a]pyrene Isomers in a Coal Tar Standard Reference Material by using Liquid Chromatography and Shpol'skii Spectrometry

January 1, 1990

Author(s)

P. Garrigues, J. Bellocq, Stephen Wise

Preparation and Analysis of a Marine Sediment Reference Material for the Determination of Trace Organic Constituents

January 1, 1990

Author(s)

Michele M. Schantz, Bruce A. Benner Jr, S. N. Chesler, B. J. Koster, K. E. Hehn, S. F. Stone, William R. Kelly, Rolf L. Zeisler, Stephen A. Wise

Synthesis and properties of azoles and their derivatives.23. Electron impact mass spectrometry of regio- and stereoisomeric diarylnitroisoxazolines

January 1, 1990

Author(s)

Anzor Mikaia, Andre Baranski

General fragmentation pathways for nitro-substituted di(aryl)isoxazolines under electron ionization are determined. Ions useful for differentiation of positional and stereo-isomers are established.

Determination of Cyclodextrin Formation Constants Using Dynamic Coupled-Column Liquid Chromatography

December 1, 1989

Author(s)

L.A. Blyshak, K.Y. Dodson, G. Patonay, I.M. Warner, Willie E. May

Hydride formation in decomposition of ethyl derivatives of lanthanides

December 1, 1989

Author(s)

Anzor Mikaia, SB Golshtein, VA Yakovlev, BA Dolgoplosk

Advantages of GC-MS is demonstrated for the study of the directions of catalytic reactions

Mobile Sources of Atmospheric Polycyclic Aromatic Hydrocarbons: A Roadway Tunnel Study

October 1, 1989

Author(s)

Bruce A. Benner Jr, G. E. Gordon, Stephen A. Wise

Subambient Temperature Modification of Selectivity in Reversed-Phase Liquid Chromatography

August 1, 1989

Author(s)

Lane C. Sander, Stephen A. Wise

Reaction chromate-mass spectrometry. 16. Chemical ionization mass spectra of certain N-Trifluoroacylamines

July 1, 1989

Author(s)

Anzor Mikaia, Alexander Ivanov, Vladimir G. Zaikin, George A. Kliger

Advantages and limitations of chemical ionization mass spectrometry for the study of amines as trifluoroacetyl derivatives are presented.

Synthesis and Characterization of Novel Bonded Phases for Reversed-Phase HPLC

May 1, 1989

Author(s)

A. M. Stalcup, D. E. Martire, Lane C. Sander, Stephen Wise

A Comparison of Liquid Chromato!graphic Selectivity for Polycyclic Aromatic Hydrocarbons (PAHs) on Cyclodextrin and C18 Bonded Phases

March 1, 1989

Author(s)

M. Olsson, Lane C. Sander, Stephen Wise

Experiences in Environmental Specimen Banking

March 1, 1989

Author(s)

Stephen A. Wise, B. J. Koster, Reenie M. Parris, Michele M. Schantz, S. F. Stone, Rolf L. Zeisler

The Determination of Fat-Soluble Vitamins in Oil Matrices by Multidimensional High Performance Liquid Chromatography

September 15, 1988

Author(s)

Jeanice M. Brown Thomas, A A. Moustafa, Stephen A. Wise, Willie E. May

Reactive chromate-mass spectrometry. 15. Acylation in a chromato-mass spectrometer column when investigating mixtures of amines.

September 1, 1988

Author(s)

Anzor Mikaia, Alexander Ivanov, Vladimir G. Zaikin

General and specific fragmentation pathways of trifluoroacetyl and heptafluorobutyryl derivatives of primary and secondary amines under electron ionization are determined. The derivatives are obtained as a result of on-column acylation.

Analytical Methods for the Determination of Organic Contaminants in Marine Sediments and Tissues

June 1, 1988

Author(s)

Michele M. Schantz, S. N. Chesler, B. J. Koster, Stephen A. Wise

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