BRIEFS

Resonance Ionization Mass Spectrometry of Sputtered Osmium and Rhenium Atoms 209 A useful yield of 1% and a detection limit of 8 ppb are demonstrated for in situ osmium concentration measure­ment, with an elemental selectivity of more than 1000 for osmium over rhenium. Joel D. Blum*, M. J. Pellin, W. F. Calaway, C. E. Young, and D. M. Gruen, Materials Science, Chemistry, and Chemical Tech­nology Divisions, Argonne National Laboratory, Argonne, IL 60439 and I. D. Hutcheon and G. J. Wasserburg, Lunatic Asylum of the Charles Arms Laboratory, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125

Correspondence Reversing Enantioselectivity in Capillary Gas Chromatography with Polar and Nonpolar Cyclodextrin Derivative Phases 214 Daniel W. Armstrong* and Weiyong Li, Department of Chemis­try, University of Missouri—RoUa, Rolla, MO 65401 and Josef Pitha, National Institutes of Health, ΝΙΑ/GRC, Baltimore, MD 21224

Effect of a Difference of the Column Saturation Capacities for the Two Components of a Mixture on the Relative Intensities of the Displacement and Tag-Along Effects in Nonlinear Chromatography 217

Sadroddin Golshan-Shirazi and Georges Guiochon*, Depart­ment of Chemistry, University of Tennessee, Knoxville, TN 37996-1600 and Division of Analytical Chemistry, Building 4500-S, M.S. 120, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6120

Technical Notes Anion-Exchange Separation of Carbohydrates with Pulsed Amperometric Detection Using a pH-Selective Reference Electrode 220 William R. LaCourse*, David A. Mead, Jr., and Dennis C. John­son, Department of Chemistry, Iowa State University, Ames, IA 50011

CIRCLE 1 ON READER SERVICE CARD 58 A · ANALYTICAL CHEMISTRY, VOL. 62, NO. 2, JANUARY 15, 1990

Analytica 90 12th International Trade Fair for

Biochemical and Instrumental Analysis with International Conference

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Munich, May 8-11,1990