Determine surface area easily and economically. With t h e Perkin-Elmer-Shell Model 212D Sorptometer, it's easy and inexpensive t o determine surface areas. It's fast—several times faster than conventional surface area measurement. This latest model handles three samples simultaneously, tripling t h e speed over past models. (The 212D is a third-generation instrument, so it's thoroughly proven.) It's accurate. Even hard-to-measure samples of low surface area can be analyzed. It's sturdy. Construction is of metal with a minimum of glass, so there's no breakage problem. Sample requirements are modest. Measurements can be made with as little as 0.02 grams — certainly no more than 5 grams. Results are o b tainable over a very broad range of surface areas. A n d t h e cost is l o w — w e l l below that of conventional techniques. W e ' d like t o send you a brochure and reprints of articles w h i c h d e s c r i b e the Sorptometer and its a p p l i cations. Write t o Instrument Group, Perkin-Elmer C o r p o r a t i o n , 7 0 2 Main Avenue, Norwalk, C o n n . 06852.
PERKIN-ELMER
News Katz, Argonne National Laboratory, 1043 S. LaGrange Rd., LaGrange, III. 60525 Solubility Studies of Testosterone in Organic Solvents Using Gas-Liquid Chromatography. Maryon W. Ruchelman, Jon T. Watson, The University of Texas; M. D. Anderson, Anderson Hospital and Tumor Institute at Houston, 6723 Bertner Ave., Houston, Texas 77025 Mass Spectral Analysis of Mandelic Acid Esters. Kenneth E. Daugherty, Technical Center, American Cement Corp., 1229 Monte Vista Drive, Riverside, Calif. 92507; John I. Stevens, Walter H. Neville, Dept. of the Army, Weapons Development and Engineering Laboratories, Chemical Process Laboratory, Edgewood Arsenal, Md.
NUCLEAR PARTICLE SPECTROSCOPY Gamma Ray Spectrometer-Computer System. J. R. Vogt, Research Reactor Facility, University of Missouri, Columbia, Mo. Neutron Activation Analysis of Rare Earth Impurities in Scandium Metal. J. J. Hines, M. A. Wahlgren, Argonne National Labs, Argonne, III.; C. A. Edwards, Western College for Women, Oxford, Ohio Radiochemical Separation of Gallium by Amalgam Exchange. R. R. Ruch, Illinois State Geological Survey, 1821 Maynard Dr., Champaign, III. 61820 A Key-Lock System Based on Nuclear Radiation Spectrometry. James Wing, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, III. 60439 The Effect of Channeling on the ChargeChanging Collisions of Energetic 'He* Ions Penetrating through Au(100) Monocrystals. Manfred Kaminsky, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, III. 60439 General Aspects of Nuclear GammaRay Resonance (NGR). Stanley Ruby, Argonne National Laboratory, Argonne, III. Multiple Linear Regression Analysis of Scintillation Gamma-Ray Spectra: Automatic Candidate Selection. M. A. Hogan, Hogan Associates; S. Yamamoto, D. F. Covell, Naval Radiological Defense Laboratory, San Francisco, Calif. A New Combustion Method for Collecting Tritiated Water from Organic Samples for Liquid Scintillation Counting. Niilo Kaartinen, University of Turku, Finland A Commercial Version of Kaartinen Sample Preparation Apparatus. D. W. Sher, A. G. Schrodt, Packard Instrument Co., Downers Grove, III.; Niilo Kaartinen, University of Turku, Finland
MÖSSBAUER SPECTROSCOPY
Circle No. 173 on Readers' Service Card See ACS Laboratory Guide for All Products/Sales Office 52 A
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ANALYTICAL CHEMISTRY
Application of Môssbauer Spectroscopy to Coordination and Biological Chemistry. Leopold May, The Catholic University of America, Washington, D.C. On the Distinction Between MassChange Shift and Second-Order Doppler Shift in the Môssbauer Effect. J. T. Dehn, U.S.A. Ballistic Research Laboratories, Md. The Point Charge Model for Quadrupole Splitting in 11BSn in Môssbauer Spec-
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ioaggka»*· Circle No. 48 on Readers' Service Card
