Briefs
Savant's Speed Vac LvdUUI ÏHIII Evaporator Concentrator «*
Pat. 4226669
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V action and vacuum application account for the high efficiency volume reduction of the sample.
100% SAMPLE RECOVERY NO BUMPING NO DILUTION NO SMEARING NO TRANSFER NOWASHDOWN NO LOSSES The Speed Vac Concentrator has replaced Flash Evaporators, Ultrafiltration, The Bell Jar Dessicator for most applications ... e.g. Eluates, Hydrolysates, Extracts, GLC and HPLC Sample Preparation. "No Doubt About It — This is the Preferred Method".
Characterization of a Bovine Serum Reference Material for Major, Minor, and Trace Elements 2106 Fifteen metals of nutritional interest are determined in bovine serum using a wide variety of analytical methods. Claude Veillon*, Susan A. Lewis, Kristine Y. Patterson, Wayne R. Wolf, and James M. Harnly, Beltsville Human Nutrition Research Center, U.S. Department of Agriculture, Beltsville, Md. 20705, and Jacques Versieck, Lidia Vanballenberghe, and Rita Cornells, Department of Internal Medicine and Institute for Nuclear Sciences, University of Ghent, Ghent, Belgium, and Thomas C. O'Haver, Department of Chemistry, University of Maryland, College Park, Md. 20742 Anal. Chem., 57 (1985) Performance Improvements of Gas-Diffusion Ion-Selective and Enzyme Electrodes 2110 Higher sensitivity and faster baseline recovery are obtained for ammonia and urea assays with a double injection and a modified ammonia electrode. George G. Guilbault*, Jerzy P. Czarnecki, and Mohammad A. Nabi Rahni, Department of Chemistry, University of New Orleans, New Orleans, La. 70148 Anal. Chem., 57 (1985) Chronopotentiometry at a Dropping Mercury Electrode: Effects of Electrode Sphericity for an Electrode Process with a Preceding Chemical Reaction 2116 Equations for the potential-time curves and transition times that take into account electrode sphericity are derived. Experimental verification of the theory using the Cd + 2 /EDTA system is presented. Jesus Galvez* and Maria L. Alcaraz, Laboratory of Physical Chemistry, Faculty of Science, Murcia 30001, Spain, and Tomas Perez and Manuel H. Cordoba, Laboratory of Analytical Chemistry, Faculty of Science, Murcia 30001, Spain Anal. Chem., 57 (1985) Coated Piezoelectric Quartz Crystal Monitor for Determination of Propylene Glycol Dinitrate Vapor Levels 2120 The dual-crystal design of the device eliminates many of the frequency stability and selectivity problems associated with piezoelectric crystal detectors. A detection limit of better than 0.05 ppm is obtained. B. D. Turnham, L. K. Yee, and G. A. Luoma*, Defence Research Establishment Pacific, FMO Victoria, British Columbia, Canada VOS 1B0 Anal. Chem., 57 (1985)
Savant can supply the entire system including the SPEEC VAC CONCENTRATOR, the Refrigerated Trap and the Vacuum Pump as well as many accessories which makes the laboratory completely operational. Send for literature today.
Savant Instruments, Inc. 110-103 Bi-County Blvd. Farmingdale, N.Y. 11735 (516)249-4600 CIRCLE 188 ON READER SERVICE CARD 1086 A · ANALYTICAL CHEMISTRY, VOL. 57, NO. 1 1 , SEPTEMBER 1985
