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STIR AND HEAT LIQUIDS
This volume consists entirely of photographic reproductions of spectra recordings of macromolecular and poly meric compounds, 549 in number. The spectra were recorded with a PerkinElmer Model 21 infrared spectropho tometer, using paper whose composition is relatively independent of atmospheric conditions. The author says that re duced photographs are presented, rather than redrawn material, in order that accurate wave-length values could be read. The wave-length records are generally accurate to ±0.02 microns. But at shorter waves (2 to 4 microns) deviations up to 0.04 microns occa sionally appear. Manual of Analytical Methods. Rec ommended for Sampling and Analysis of Atmospheric Contami nants. Committe on Recommended Analytical Methods. American Con ference of Governmental Industrial Hygienists, 1014 Broadway, Cincin nati 2, Ohio. 1958. $5.00.
TEMCO STIR-PLATE ®
combines a var iable magnetic stirrer and a closely controlled hot plate so that you can now stir and heat liquids simultan eously . . . or perform either operation independently. Ideal for the many stirring, dissolving and mixing operations performed in the modern-day laboratory. Magnetic stirring action lets you stir liquids in closed or vacuum-sealed systems, oddshaped or narrow-necked vessels, and other non-magnetic flat or curved-bot tom containers not usable with many ordinary stirring units. Hot plate lets you apply thermo statically controlled heat over a wide stepless range to make this the ideal combination stirring-heating unit to bring extra time and money savings to your laboratory. Compact, stream lined design . . only iy%" square, β%" high. Price complete with two stir ring magnets and 5' cord with plug, $84.50. Write for free literature and n a m e of nearest dealer. THERMO ELECTRIC MFG. CO. 478 Huff Street, Dubuque, Iowa
Circle No. 83 on Readers' Service Card 84 A
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ANALYTICAL CHEMISTRY
This manual was developed to pro vide industrial hygienists with the methods which the committee has ap proved for the sampling and analysis of atmospheric contaminants. Since the work is a continuing project, the manual is offered in loose-leaf form so that future methods may be added as they are approved and published. In cluded up to the time of publication are determinations for arsenic, chlorin ated hydrocarbons, formaldehyde, hy drogen sulfide, lead, manganese, mer cury, oxides of nitrogen, parathion, and sulfur dioxide. Two methods are given for the latter: the Fuchsin-Formaldehyde method and the polarographic method. Papierchromatographie.
4th
ed.
Friedrich Cramer. 215 pages. Verlag Chemie, GmbH, Pappelallee 3, Weinheim/Bergstr., Germany. 1958. DM 21.—. Since its first appearance in 1953, this book has grown from 89 pages. Its original purpose, however, is not changed. It is designed primarily as a handbook and an instruction book for laboratory use. As such, it gives in structions on work methods, as well as information for work with specific compounds. In its general portion it covers such topics as theory, methods, paper chromatography with radioactive isotopes, and paper electrophoresis. Its specialized sections deal with a large number of compounds such as amino acids, peptides and proteins, alcohols, alkaloids, vitamins, steroids, and others. There are many photographs and
tables, and also eight color reproduc tions of chromatograms. Quantitative Organische Mikroanalyse. 7th ed. H. Roth, xiii + 361 pages. Springer-Verlag, Môlkerbastei 5, Wien I, Austria. 1958. DM48. This new edition of a well-known work on quantitative organic microanalysis is improved by the inclusion of various advances in the form of new methods of elementary analysis and group determination. Descriptions of the individual analytical procedures have been shortened with regard to the generally used apparatus, the preparation of solutions, and the preparation of substances for preliminary analysis. Along with this has come an effort at clearer and more concise description of work methods. The importance and uses of the Pregl methods are extensively described. These, the author feels, serve in outstanding ways to facilitate the assimilation of the fundamental knowledge and abilities that every microanalyst must have. Also, they serve well as bases for further development of microanalytical methods. Chromatographische Methoden in der Analytischen und Praparativen Anorganischen Chemie Unter Besonderer Bemcksichtigung der lonenaustauscher. Ewald Blasius. xx + 370 pages. Ferdinand Enke Verlag, Hasenbergsteige 3, (14a) Stuttgart-W, Germany. 1958, DM 96.—. The author was impelled to prepare this book by a need for summarized work in the German language on the well-established field of chromatography. While acknowledging the indispensable nature of the methods in organic chemistry, he confines himself to the area of inorganic chemistry. The book is designed to satisfy the demand among experienced personnel for such a work. But, at the same time, it is aimed at the beginner who wants to examine the possibility of using the procedures for solution of certain problems. Special emphasis, therefore, is placed on working out general viewpoints in the first part of the book and the special chapters. The literature up until about the end of 1956 was systematically searched, with later work being referred to only as the author saw fit. Some hitherto unpublished individual investigations have been worked into the text. General literature references are found at the end of
