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ing their nature. A very great fraction of the review is naturally on metalliquid ammonia solutions, about which most is known, but there is also pertinent reference to metal-amine and metal-ether solutions. After a brief consideration of solubilities and phase diagrams, the properties of dilute solutions, solutions of intermediate concentration, and concentrated solutions are taken up in turn. This reader, whose interest in nonaqueous solvents is primarily in their use as media for chemical reactions, found the chapter most enlightening. The final chapter in the book is an authoritative account of some aspects of inorganic chemistry in liquid ammonia, the solvent most extensively investigated by inorganic chemists. Topics discussed in some detail include structural considerations and physical properties, solvent purification, solubility relationships, electrochemical studies, reactions of the representative elements and their compounds, and reactions of transition metal compounds. Techniques of Organic Chemistry. Vol. XII. Thin-layer Chromatography. Justus G. Kiwhner. xxi
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788 pages. John Wiley &. Sons. 605 Circle No. 38 an Readers’ Service Card
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78 A
ANALYTICAL CHEMISTRY
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Third Ave., New York, N . Y . 10016. 1067. $W1.95. Reviewed b y Kurt Randevath, The John Collins Warren Laboratories of the Huntington Memorial Hospital of Harvard University at the Massachusetts General Hospital, Boston, Mass. 02114. Justus G. Kirchner, whose pioneering work was published about 15 years ago in this Journal, first clearly demonstrated the scope and importance of the method now known as thin-layer chromatography (TLC). He now has written a comprehensive text on this method, The book covers the applications of thin-layer chromatography and electrophoresis until the end of 1964, including a large part of the literature published in 1965. The first part (240 pages) gives, after a historical introduction (pp. 3-7), a detailed review of the general experimental procedures, including preparation of layers, types of adsorhents, development of chromatograms, the various detection methods, quantitative analysis, and preparative chromatography on thin layers. Although the importance of Kirchner’s early contributions is obyious to any careful reader of his papers, in the perspective of history, one must not completely overlook the contribution of Stahl, who in 1958 introduced TLC in its present form by emphasizing the use of standardized adsorbents and equipment.
No sacrifice in response or efficiency. Choose a Sargent combination pH electrode by size alone.
The theoretical aspects of TLC are not discussed, but reference is made to the literature on the theory of chromatography. The second part (488 pages) describes applications of TLC to special classes of compounds. It is divided into 21 chapters dealing with practically every type of organic and inorganic compound that has been subjected t o TLC. There is a large number of tables listing RF x 100 values. Descriptions of techniques are not very detailed so that the reader will have to consult the original literature to reproduce most separations. The omission of detailed descriptions, however, made possible an almost exhaustive coverage of the literature and the accumulation of a large amount of data. Addresses of commercial suppliers are listed in an appendix. The subject index is very extensive (54 pages). There is no author index. Some readers may be somewhat disappointed t o find in a book of this length hardly any comparison of thinlayer methods with other separation methods. Of course, a single author cannot be expected to be familiar with all possible separation techniques for all classes of compounds. However, it seems regrettable to me that Kirchner does not refer to some standard texts, in which such comparative information can be found-e.g., Yeher’s “Steroid Chromatography” (1964) or Strohecker and Henning’s “Vitamin Assays”
Both of these Sargent Combination p H electrodes cover the entire p H range from 0 to 14 pH. Both offer fast, linear responseeven in highly acid solutions. Response to alkali ions is insignificant below pH 12.5 (at higher pH, response i s low and stable). Both electrodes achieve high efficiency, with a millivolt/pH response close to the Nernst coefficient. And you get this kind of performance over a range of 0 to 80°C. These electrodes also feature all-glass, shock-resistant construction. N o rubber or plastic to contaminate samples. No pockets to trap solutions or hamper cleaning. Stainless-steel caps provide sure, strong clamping. What’s the difference, then, between these two combination pH electrodes? Size alone. For samples as small as M m i or those in extremely confined volumes, choose the miniature electrode (priced at $40.00). Otherwise, your best choice is the standardsize ($38.00). Both come with convecting cable and plugs to fit all popular pH meters. Call your Sargent man or write to us for a closer look at these combination pH electrodes or for data on our complete line of glass and reference electrodes.
(1963).
Dr. Kirchner’s book represents the most comprehensive review on the subject of TLC available today in the English language. This vast amount of information assembled mill soon make this text indispensable t o all chemists, biologists, and pharmacists, who use -4s a reference chromatography. source, the book is of considerable value and should be easily accessible to anybody who employs chromatographic separation techniques, either routinely or only occasionally. It has already proved t o be invaluable to the referee.
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Adsorption, Surface Area and Por-
S.J . Gregg, K . S. W . Sing. 371 pages. Academic Press, Inc., 111 Fifth Ave., iYew York, N . Y . 10003. 1967. $18. osity.
xi
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SARGENT@
Reeiewed b y W. B. Innes, Purad 724 Kilbourne Dr., Upland, Calif. 91 786.
Scientific laboratory instruments, apparatus, chemicals. E. H. Sargent & Co. 4647 Foster Ave., Chicago, 111. 60630
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The stated aim of this book is a critical exposition of the use of adsorption data for eyaluation of surface area and pow ::ze di:tribution of p o r o u solids. In rhc introcluction, pore; are classified
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VOL. 39,
NO. 14, DECEMBER 1967
79 A
