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The precision Swiss made micro p i p e t t e u n i t has a machined plunger and barrel assembly cali brated to a fixed volume which is dispensed with a tolerance of ± 1% for accuracy of sample size and reproducibility. The liquid sample is drawn only into the disposable polypropylene tip and does not enter the pipette itself. The sealed v o l u m e t r i c u n i t is housed in a p r e c i s i o n g r o u n d glass barrel giving the required protection. The exclusive design of the micropipette allows the unit to function without the use of an O-Ring. Volumetric errors due to O-Ring malfunction and wear are thus eliminated. The micropipette requires prac tically no maintenance since its unique construction without an O-Ring makes l u b r i c a t i o n u n necessary. The Elkay "Socorex" micropipette has a slim line with an outer di ameter of 14mm. which allows in sertion into long test tubes.
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chromatographic methods which have become predominant in the more recent literature. Many of the methods described will certainly be useful in laboratories where spectrometers and chromatographs are not available or in cases where only a few determinations are to be made, but I think that in many cases, some form of a gas chromatographic procedure would be simpler and better than many of the procedures described. The procedures are usually described in sufficient detail to enable an analytical chemist to use the method without going to the original literature. In many cases, the preparation or availability of reagents is noted in the procedure description. Useful detailed instructions for calculating results are often included. A number of tables provide lists of compounds which have or have not given satisfactory results with the various methods. The author has succeeded in his aim of writing a useful compendium limited mainly to chemical methods. However, I cannot help feeling that the book would be more valuable if chromatographic and spectroscopic methods had been included.
N e w Books Surface Properties of Materials. L. L. Levenson, Ed. 294 pages. American Elsevier Publishing Co., Inc., 52 Vanderbilt Ave., New York, N.Y. 10017. 1975. $37.50
This book contains 16 selected papers presented at the Conference on Surface Properties of Materials, which was held at the University of Missouri-Rolla from 24 to 27 June 1974. The topics in surface analysis treated in the book include Auger electron, photoemission, appearance potential, ion scattering, and secondary ion emission. Concepts of Inorganic Photochemistry. Arthur W. Adamson and Paul D. Fleischauer, Eds. xiii + 439 pages. John Wiley & Sons, Inc., 605 Third Ave., New York, N.Y. 10016. 1975. $22.50
Intended as resource material for courses in photochemistry and in inorganic chemistry, this multiauthored book presents a comprehensive account of the developments in coordination photochemistry. The first two
CIRCLE 72 ON READER SERVICE CARD 1270 A · ANALYTICAL CHEMISTRY, VOL. 47, NO. 14, DECEMBER 1975
chapters discuss the physical properties of the excited states of coordination compounds. Chapters 3 and 4 deal with the charge-transfer and substitution photochemistries of the first row transition metal ions. Chapters 5-9 treat the photochemistry of the heavier elements, carbonyl and related complexes, certain families of chelates, simple ions in solution, and complexes in the solid state. A final chapter deals briefly with some concepts regarding photochromism and chemiluminescence.
ASTM Publications The following are available from the American Society for Testing and Materials, 1916 Race St., Philadelphia, Pa. 19103 (add 5% shipping charges for countries other than USA, Canada, and Mexico) Liquid Chromatographic Data Compilation. Atomic and Molecular Data Series 4 1 . Soft cover. 196 pages. 1975. $15
This compilation is designed to make available to the chromatographer the separations and key separation parameters described in the literature. The coverage is limited to closed systems, i.e., a system containing a pressurized source of mobile phase, an injection device, a column and continuous detector. The primary function of the system is to provide sufficient information to separate one compound from another. Computerized Laboratory Systems. Special Technical Publication No. 578. 278 pages. 1975. $24
This book presents actual examples of the methods used to specify, implement, and document computerized laboratory systems. One chapter, "A Feasibility Study and Functional Design for the Computerized Automation of the Central Regional Laboratory EPA Region V, Chicago", is an actual completed working document that contains detailed definitions, specifications, and functional designs for a laboratory automation system which is being developed by the Lawrence Livermore Laboratory for the EPA Region V Laboratories. Directory of Testing Laboratories. Special Technical Publication No. 333D. Soft cover. 68 pages. $3.75
This directory lists commercial and institutional testing laboratories which test commodities for acceptance or for other purposes in accordance with standard specifications. It gives the locations of testing laboratories equipped and prepared to undertake testing on a fee basis.
