LFE CORPORATION


LFE CORPORATIONpubs.acs.org/doi/pdf/10.1021/ac60371a764stration. AVAILABLE UNDER. GENERAL SERVICE ADMINISTRATION. CONTRA...

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LOW TEMPERATURE ASHER NEW IMPROVED PERFORMANCE ATA NEW LOW PRICE INCREASED ASHING RATES: • improved oxidation chamber design • optimum sample "boat" design • 300 watts of R.F. power output • improved power coupling efficiency NEW FEATURES: • manual or patented automatic sample boat agitation • controls and logic for automatic pump-down and slow purge to prevent sample-residue disturbance or accidental loss AREAS OF APPLICATION: The LFE Low Temperature Asher is used in the separation and high percentage recovery of inorganic trace elements from an organic matrix of a food, biological, chemical, or pharmaceutical sample prior to spectrochemical analysis. In addition, the LTA is used for the separation of particles from filter matrices for study of air pollution samples. Try it in your laboratory. Call LFE for further information or for a free demonstration.

A V A I L A B L E UNDER GENERAL SERVICE A D M I N I S T R A T I O N C O N T R A C T N U M B E R GS-OOS-26753

Process Control Division CORPORATION

1601 Trapelo Road Waltham, Massachusetts 02154 (617) 890-2000

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BOMB CALORIMETERS with automatic adiabatic control automatic sequencing digital thermometer and temperature printout

For determing Btu or calorific values of coal, oil, foodstuffs and other combustible samples with maximum speed, accuracy and operating convenience. For details, write or phone: Parr Instrument Company, Moline, Illinois 61265. 309/762-7716

CIRCLE 167 ON READER SERVICE CARD 596 A ·

ANALYTICAL CHEMISTRY, VOL. 48, NO. 7, JUNE 1976

Parr

and other related inorganic compounds compiled from the literature. Characteristic vibrational frequencies for the more common inorganic ions are correlated in one chart. Spectral data such as frequency, relative intensity, and some band shape information for individual materials are presented in tabular form. Reference spectra are not included. Also, no indication of sample preparation is given. For identification of unknowns, the reader is expected to refer to the original literature cited for details of sample preparation and for reference spectra. Also, the reader is left to decide whether or not impurity bands are present. Without spectra, this could lead to difficulties in interpreting ion-exchange phenomena, isomorphous shifts, and so forth. The book is a useful guide to the infrared literature dealing with minerals and related inorganic materials. For the purposes of identifying unknowns, this book is a good starting point but should be considered only as a secondary reference. The original literature must be consulted. Interfacial Electrochemistry: An Experimental Approach. E. Gileadi, E. Kirova-Eisner, and J. Penciner. xviii + 525 pages. Addison-Wesley Publishing Co., Inc., Advanced Book Program, Reading, Mass. 01867. 1975. $13.50 Reviewed by Zbigniew Galus, Institute for Fundamental Problems in Chemistry, University of Warsaw, Warsaw, Poland The authors have limited themselves largely to the presentation of experimental electrodics. As such, this book is complementary to the available literature in electrochemistry. The study of electrodics through experiments aids in understanding organic and inorganic reactions at electrodes and is important not only from a theoretical but also from a technological point of view. The book is divided into two parts. The first part gives fundamental information on the double-layer theory and electrode kinetics. The second part presents in 14 chapters various groups of experiments from electrodics preceded by theoretical introductions. I question whether this division is the most effective. An alternative approach would be to incorporate the information given in the first part into the introductions preceding each group of experiments. Such an approach would give a more uniform pic-