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Displaying 1951 - 1975 of 2087

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 I. 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 I. 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 I. 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 I. 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.