Chem Service Reference & Analytical Standards
Over 13,000 high-purity, pre-analyzed lab chemicals. Available in gram- size quantities. Individually or in kit format.
Alternating Current Amperometry at a Carbon Paste Electrode with Charging Current Nulling 560 Measurement of subnanomolar solutions of o-dianisidine is achieved using phase-sensitive ac amperometry at a carbon paste electrode. An ac nulling circuit is constructed and used in conjunction with a digital lock-in amplifier to discriminate against ac charging currents. Mark B. Gelbert and D. J. Curran*, Department of Chemistry, University of Massachusetts, Amherst, Mass. 01003 Anal. Chem., 60 (1988)
A Solid-Surface Luminescence Interactions of Nitrogen Heterocycles Adsorbed on Silica Gel Chromatoplates Submerged In Chloroform/ff-Hexane Solvents 564 The effects of chloroform/n-hexane solvents on the roomtemperature fluorescence and phosphorescence of benzo[/] quinoline and benzo[ft]quinoline are described. G. J. Burrell and R. J. Hurtubise", Chemistry Department, University of Wyoming, Laramie, Wyo. 82071 Anal. Chem., 60 (1988)
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CIRCLE 30 ON READER SERVICE CARD
Ordered Media in Chemical ^ ^ Separation^
T
his book is the first to offer the scientist a concise description of the different roles and uses of ordered media in separation science. The past decade has seen rapid advances in the utilization of surfactant normal and reversed micelles, surfactant vesicles, and cyclodextrins in separation science. This volume will introduce you to the different types of ordered media, and familiarize you with their use in various separation science techniques. Just a few of the areas covered include · micellar liquid chromatography · micellar-enhanced ultrafiltration · micellar electrokinetic capillary chromatography • extraction of byproducts with reversed micelles · utilization of cyclodextrines as stationary and/or mobil-phase components in chromatography. If you're involved in chromatography, separation science, analytical or micellar chemistry, or bioseparations, you'll find this book the one source of information you must have to keep current in this rapidly expanding area of science. Willie A. Hinze, and Daniel W. Armstrong, Editors ACS Symposium Series No. 342 LC 87-13563 ISBN 0-8412-1402-6
BRIEFS
Selection of Calibration Samples for Near-Infrared Spectrometry by Factor Analysis of Spectra
Dual On-Column Fluorescence Detection Scheme for Characterization of Chromatographic Peaks
573
An on-column detection scheme is presented that successfully eliminates extracolumn dispersion, allowing the accurate measurement of column variance. Both volumetric and temporal sources of extracolumn dispersion are investigated, and accurate measurement of variances of
