WHEATON MICRO ROTARY EVAPORATOR With Glassware Kit
Compact system saves time — increases sample recovery • Expand rotary evaporator glassware to combine operations • Performs solvent extractions and solvent stripping in the same system • Collect micro samples directly into chromatography vials • Glassware features Wheaton Grease-Free screw-threaded connections • Glassware components are packed in a convenient, easy-to-store, protective, foam-lined case
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BRIEFS Mobility of Pyrene on Chemically Modified Silica Surfaces 2487 Pyrene is adsorbed on three common chemically modified silicas used in liquid chromatographic separations. The mobility of pyrene on the surface and the temperature dependence of this mobility are determined by measuring the time dependence of pyrene excimer formation using a fluorescence method. Jan Stâhlberg*, Astra Pharmaceutical Production AB, Quality Control, S-15185 Sôdertàlje, Sweden, and Mats Almgren and Jan Alsins, The Institute of Physical Chemistry, University of Uppsala, P.O. Box 532, S-751 21 Uppsala, Sweden Anal. Chem., 60 (1988) Simultaneous Determination of Salicylic and Salicyluric Acids in Urine by First-Derivative Synchronous Fluorescence Spectroscopy 2493 Overlapping fluorescence spectra of salicylic and salicyluric acids are resolved by first-derivative synchronous fluorometry. Separation techniques are unnecessary for the simultaneous determination of the acids in urine. Arsenio Munoz de la Pena*, Francisco Salinas, and Isabel Duràn Meràs, Department of Analytical Chemistry, University of Extremadura, 06071 Badajoz, Spain Anal. Chem., 60 {1988) Determination of Yttrium in Complex Nickel-Base Alloys Using Microwave Dissolution and Inductively Coupled Plasma Optical Emission Spectrometry 2497 Yttrium in nickel-base superalloys can be directly determined, without having to matrix-match standards, over the range of 10-2000 ppm with an overall accuracy of ± 5%. Paul A. Vozzella* and David A. Condit, United Technologies Research Center, Silver Lane, MS 94, East Hartford, CT 06108 Anal. Chem., 60 (1988) Evaluation of Inductively Coupled Plasma Mass Spectrometry for the Determination of Trace Elements in Foods 2500 Enhancement or suppression of the trace element response is generally less than 10% in the presence of 1000 mg/L of each major added element. Quantitation using a single standard calibration is possible. R. Duane Satzger, Elemental Analysis Research Center, Food and Drug Administration, 1141 Central Parkway, Cincinnati, OH 45202 Anal. Chem., 60 (1988) Coincidence Profiles for Phosphorus Emission at 178.287 nm Observed in the Third Order by Inductively Coupled Plasma Emission Spectrometry 2505 Interference profiles of V, Ti, Ni, Μη, Cr, Cu, Mg, Al, Fe, Si, and Ca are presented. A simple technique for distinguishing vacuum UV from UV lines by using the spectrometer argon purge nozzle as an air optical filter is demonstrated. Khudre M. Attar, Central Analytical and Materials Characteriza tion Laboratories, Research Institute, King Fahd University of Pe troleum & Minerals, Dhahran, Saudi Arabia Anal. Chem., 60 (1988)
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1262 A · ANALYTICAL CHEMISTRY, VOL. 60, NO. 22, NOVEMBER 15, 1988
