NOW A MAJOR ADVANCE i n the measurement of
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• AUTOMATIC unattended • HIGH ACCURACY & PRECISION • SAMPLES FROM 10mg-2g • 1-100 μ • EASY CALCULATIONS The new Cahn Particle Sedimentation System is a major advance in par ticle size instrumentation. It is an automatic recording sedimentation balance incorporating the latest theoretical and experimental ad vances in this rigorously correct and highly regarded technique. It yields weight percent as a function of equivalent Stokes d i a m e t e r . . . and agrees closely with other sedimenta tion methods, permitting easy tran sition from them and immediate use of its data.
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ANALYTICAL CHEMISTRY
NEW BOOKS Reviewed by Peter Diehl, Univer sity of Basel, Basel, Switzerland. The book represents an expansion of an article published several years ago in Chemical Reviews. It provides a thor ough treatment of mathematical tech niques and essential quantum mechani cal ideas which form the basis for the analysis of high-resolution NMR spec tra. It is intended to be of particular interest- for organic, inorganic, physical, and analytical chemists. For readers who are insufficiently prepared in lin ear algebra or other mathematical tools used in the book, appendixes have been added. From a theoretical and mathematical point of view, the author has undoubt edly realized his aims. The book is ex cellent in scope and depth of theoretical presentation, but in certain chapters— e.g., on x-approximation for symmetri cal systems—the excessive use of mathe matics leaves the reader with a feeling that the subject could have been ex plained in a more straightforward manner. From a practical point of view, the book presents a very large amount of information about the properties of NMR spectra but does not give an in troduction into the practical analysis of spectra. This certainly reduces the value of the book especially for organic, inorganic, or analytical chemists. Important methods of analysis, for example the "direct method," have been treated in one sentence, whereas the "moment analysis" which is of mini mum practical importance has been dis cussed at length. It is not obvious why the author has omitted the important field of high-res olution NMR spectra of oriented mole cules in liquid crystals, a subject which certainly would have been within the scope of such a book. The reviewer nevertheless likes the book which provides an extensive cov erage of the important literature in the field of high-resolution NMR spectros copy and would recommend it to more theoretically minded readers. Laboratory Techniques in Chemistry and Biochemistry. P. S. Diamond, R. F. Denman. xii + 491 pages. D. Van Nostrand and Co., Inc., ISO Alexander St., Princeton, N. J. 08540. 1966. $18.50. Reviewed by Anthony M. Gawienowski, Dept. of Biochemistry, University of Massachusetts, Amherst, Mass. The book is a fine reference for the biochemist and chemist on the tech niques used in modern laboratories. Technicians and students can easily fol
low the detailed descriptions on instru mental methods such as pH measure ment, potentiometry, colorimetry, spec trophotometry and polarimetry. The descriptions of the methods are at the practical level. The majority of the equipment men tioned in the text is of British manu facture. Overall most of the present day techniques and instruments are mentioned with the exception of atomic absorption spectrometry. The chapters include purification, electrochemistry, inorganic analysis, el ementary organic analysis, colorimetry, chromatography and electrophoresis, special techniques (high vacuum, polarograph, isotopes), biochemical labora tory apparatus and methods, introduc tion to biochemical compounds, and en zymes. A good condensed review of biochemistry is given in the last two chapters of the book. Appendix I contains "The Literature of Chemistry" which describes the tech nique for searching in a large chemical library for literature on specific topics. It also lists chemical encyclopedias, large reference works, and abstracting services. Appendix II includes a large bibliography of books containing infor mation on methods. The book fulfills a need for a concise analytical reference source and should be a welcome addition to chemistry, biochemistry libraries, and large labora tories.
Analytical Reactions in Gas Chroma tography. Viktor G. Berezkin, A. V. Topchiev Institut Neftekhimicheskogo Sinteza (A. V. Topchiev Insti tute for Petrochemical Synthesis), USSR Academy of Sciences. Izdatelstvo "Nauka" (Science Publish ers). 184 pages. Moscow, 1966. Reviewed by Julian F. Smith, Lenoir Rhyne College (retired), Hick ory, N. C. Though slanted to the chemical reac tions and products of compounds oc curring in or derived from petroleum, this is not a one-sided book. Largely a state-of-the-art review, it also reports on the work of the author and his In stitute. There is no concentration on Soviet literature to the exclusion of Western contributions ; of 359 reference citations, 112 are from ANALYTICAL CHEMISTRY. Western Europe and Ja pan are also well represented. The first use of chemical reactions in the gas chromatograph itself is attrib uted to N. H. Ray, A. E. Martin, and J. Smart in England in 1955. Against a background of theory and experimental technique, applications of hydrogena-
