FASTER SERVICE LOWER COST
VANADIUM DETERMINATIONS Vanadium determinations are now performed faster and at lower prices than ever before by General Atomic's Activation Analysis Service. Results are tele phoned within 5 working days of receipt of the samples (or within 2 days if required), and then immediately confirmed by air mail. Prices for these sensitive instrumental vanadium determinations are now as low as $15 per sample when contracted for in quantity, and only $25 per sample in small lots. The activation analysis method is rapid, nondestructive, accurate (±2 per cent of the value at higher vanadium levels) and sensitive—down to 0.001 ,ug, or 0.0001 ppm in 10-gram samples. The method consists of activating the vanadium with neutrons and counting the radioactive vanadium which results. Routine determination of vanadium in most organic and many inorganic sample types is included in this fast, economical service. The activation analysis method for vanadium has been thoroughly proved at General Atomic with the analysis of hundreds of samples of such materials as plastics, alloys, rubber, crude oil, refinery feed stocks, used catalysts, and many others. In cases where the purely instrumental method is not feasible, radiochemical separations can be used to obtain the desired results. P h o s p h o r u s , Sulfur and 70 other elements are also routinely determined to sub-ppm levels by General Atomic's Activation Analysis Service. FOR FREE ACTIVATION ANALYSIS BROCHURE AND VANADIUM DETERMINATION INFORMA TION, fill out this coupon and mail to: Manager Activation Analysis Service, Dept. AA-65 General Atomic, P. O. Box 608 San Diego, Calif. 92112 -..Phone
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GENERAL DYNAMICS G E N E R A LCircleA TOMIC DIVISION No. 27 on Readers' Service Card 92 A
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ANALYTICAL CHEMISTRY
NEW BOOKS and solvent extraction. Chapters 3 to 26 are devoted to the determination of individual elements, Chapter 27 to the determination of gases (Ο, Η, Ν) and Chapter 28 to "combined procedures." Finally, the last chapter discusses the author's philosophy on "rationaliza tion" of analytical procedures. Although most "modern" laboratories presently employ spectrographic meth ods for determination of impurities in copper to the extent that only some nonmetals are determined chemically, not sufficient space is devoted to spec trographic analysis. The detection lim its listed for various impurities in cop per are well above those obtainable in a routine manner in most copper refinery laboratories. This deficiency is not entirely the author's fault, since un fortunately there has been some re luctance on the part of industrial lab oratories to publish their more ad vanced analytical techniques. The 58 detailed chemical procedures reported in the book will be found to be of con siderable value in those laboratories which lack an emission spectrograph, and to a lesser degree in all other lab oratories equipped with the most mod ern instrumentation where occasional chemical analysis is still required for standardization or check purposes. The fact that the price of the second enlarged edition has been reduced to less than half that of the first edition should contribute to its more wide spread distribution. Bibliography of Paper Chromatog raphy 1957-1960 and Survey of Applications. Karel Macek et al. 706 pages. Academic Press, Inc., Ill Fifth Ave., New York 3, Ν. Υ. 1964. $24. This book, while self-contained, rep resents a continuation of the "Bibli ography of Paper Chromatography" by K. Macek and I. M. Hais which covered papers published until 1956. The General Part, 26 pages, lists books and reviews and papers related to theory and techniques in paper chro matography. Thereafter, the contents are classified according to compounds being sought in various materials. Finally, there is an author index and a list of substances chromatographed. An Introduction to Electron Spin Res onance. Terence L. Squires. 140 pages. Academic Press, Inc., Ill Fifth Ave.. New York S, Ν. Υ. 1964. S5.Ô0. This book was written for chemists and physicists taking up spectroscopy for the first time, undergraduates, teachers, technicians, and sales engi-
