THE WELCH CRYOREFRIGERATOR IS A NEW CONVENIENCE FOR LN 2 USERS
NEW BOOKS methods. Limitations and advantages are cited. The spectrographer will feel that his area of specialty has been minimized. However, to cover such a tremendous task of compiling modern methods of this group of elements, only a limited coverage of each analytical specialty could be made. As indicated, this book makes no effort to instruct in any single analytical discipline. It very success fully presents practical solutions to the problem of how best to analyze these new and most important elements. The section on sampling is also direct and practical and will be useful to the novice. The authors should be congratulated on successfully compiling and present ing such a useful volume which includes methods published as recently as 1965. Quantitative
Analytical
Chemistry.
./. S. Fritz, G. H. Schenk, Jr., xii + •516 pages. Ally η and Bacon, Inc., 150 Fremont St., Boston, Mass. 02111. 1966. $8.95. Reviewed by Arthur F. Findeis, De partment of Chemistry, University of Alabama, University, Ala, 35486.
H o w convenient depends on whether you have . . . watched an experiment evaporate because your LN2 (liquid nitrogen) delivery was late . . . or gone to the dewar and found it was dry . . . or run down the hall to "borrow a cup" . . . or been just plain fed up because you don't use LN2 often enough to guarantee its availability when you need it. If you have been inconvenienced by LN2, why not invest $375 in a permanent cold source, a Welch Cryogenic Refrigerator? It's a low cost way to declare your independence from LN2 troubles. Slightly more than one foot high, it weighs only 12 p o u n d s . . . really portable. The Welch Cryogenic Refrigerator operates on a standard laboratory source of compressed air to obtain temperatures in the -140° C region. There are specific models at $395 for CEC, GE, NRC and Veeco leak detectors. A general purpose unit is available at $375 which can be adapted for applications in mass spec trometry, gas chromatography, solid state circuit production, tissue freezing, etc. If you'd like to declare your inde pendence from LN2 ask for Bulletin 112. Call or write The Welch Scientific Company, 7300 N. Linder Ave., Skokie, Illinois 60078. Telephone 312/677-0600
WELCH S C I E N T I F I C Circle No. 184 on Readers' Service Card 88 A
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ANALYTICAL CHEMISTRY
The role of analytical chemistry in chemical education is in a state of flux. This book should be considered by any one wishing to reevaluate the tradi tional requirements in beginning an alytical chemistry. It is divided into two parts: principle and theory, and laboratory techniques and procedures. The first part covers the usual classical methods and includes gravimetric and titrimetric methods of analysis with a particular emphasis on many types of titrimetric procedures. The introduc tion of the newer nonequilibrium tech niques of the application of reaction rates for chemical analysis is a signifi cant addition. The separation tech nique of ion exchange is included. Electrochemistry is covered with refer ence to electrodeposition, coulometric methods of analysis, and polarography. Extraction and a number of types of chromatography are discussed. The final chapter in Part I covers emission and flame methods of analysis. The second part of the book includes a section on the treatment of analytical data including deviations and the nor mal error curve. A chapter on the use of the analytical balance follows. The usual laboratory techniques are thor oughly covered. Directions for 31 ex periments are then provided in Part II. These are divided as follows: One ex periment on the analytical balance, four experiments on gravimetric procedures, one experiment on calibration of glassware, eleven experiments on titri
metric procedures, four experiments on spectrophotometric instruments and procedures, five experiments on electroanalytical procedures, and finally, four experiments on analytical separa tions. The individual experiments are concisely described and the procedures should be readily followed by the begin ning students. Enough material is pro vided for an introductory course under going a transition from the traditional approach to the contemporary instru mental methods viewpoint so that the book will have a lasting quality. The omission of experiments on the use of reaction rates was disappointing to the reviewer. An experiment on conductivity measurements as applied to chemical analysis would have been appropriate. A derivation of the mathematical relation concerning the relative error in spectrophotometric readings would have been useful. The experiment using the Duboscq colorim eter is not likely to be utilized and could well have been eliminated. These are of minor importance, however, due to the overall excellence of the book. The problems or questions provided at the end of each chapter are appropriate to the content of this text. Answers to selected problems are included at the end of the book. This text concentrates on principles and introduces the student to the im portant implications of structure and mechanism not usually covered in a text of this level. Sufficient experi ments are provided for a course of one academic year. Many freshman chem istry programs will already have cov ered some of the laboratory exercises leaving the advanced experiments for a one-semester course. This reviewer was impressed with the text. The book is very well written and the quality of the book is excellent. It warrants an en thusiastic response and is highly rec ommended as an undergraduate text. H i g h Resolution N u c l e a r M a g n e t i c Resonance Spectroscopy. Vols. I
and II. J. W. Emsley, J. Feeney, L. H. Svtcliffe. L + 663 pages. Hi + 488 pages. Pergamon Press, Inc., 44-01 21st St., Long Island City, New York. N. Y. 11101. Vol. I, 1965. $17.50; Vol. II, 1966. 817.50. Reviewed by Ernest Lustig, Di vision of Food Chemistry, Food and Drug Administration, Washington, D.C. 20204. These volumes represent a monumen tal effort in summarizing the develop ments in high-resolution NMR through 1963. The field has become so vast that this book may quite well be the last such effort by a single team to en-
