THROW-AWAY
CARTRIDGE
DE-IONIZER PRODUCES
CHEMICALLY-
PURE WATER RIGHT
FROM
THE TAP
INSTANT PURIFIED WATER O p e n the tap or unclamp the tubing — you get chemically-pure water at once. R u n only as much as you need •— a few ounces o r a bottle-full.
CHEMICALLY EQUIVALENT TO TRIPLE-DISTILLED Note the purity of effluent shown in speci fications below. De-ionized water is ac cepted by U S Pharmacopoeia as equiva lent for all but injection solutions.
USED ONLY WHEN NEEDED With this Cartridge De-Ionizer, your pure water is actually " o n t a p . " You can come back for more at any time — it's always available. Flow rate is generous — 5 g p h .
CONVENIENT— EASY TO INSTALL You snap the Cartridge into the Wall Bracket, o r clamp it into the M o u n t i n g Fixture. T h e resin changes color as ex hausted — a clear line shows h o w much capacity remains. Write for Bulletin CD161 giving full details. RESEARCH MODEL Removes all ionizable solids including silica and CCh. Average in ef fluent less than 0.5 ppm total solids. Capacity, 500 grains as C-àCCh. Flow Rate, 5 gph max. Price, $12.50
UNIVERSAL MODEL Removes all ionizable solids, except silica and CO*. Suitable for general pure water needs. Capacity, 1000 grains as CaC0 3 . Flow Rate, 5 gpli max. Price, $9.75
W A L L B R A C K E T w i t h slip-on connection t o water faucet $7 50 M O U N T I N G FIXTURE, d a m p - i n type for linepressure use $ 12.00
Order from Your Laboratory Supply House
ILLINOIS WATER TREATMENT CO. 840 Cedar St., Rockford, III.
NEW BOOKS Specific Techniques for I n d u s t r i a l P r o d ucts a n d other Special Substances. These include: Air P o l l u t a n t s ; Amino Acid Analysis of P r o t e i n H y d r o l y z a t e s ; Chemical Analysis in Clinical Medicine ; Fertilizers ; G a s Analysis-Vacuum Techniques; Pesticides; Plastics; Sili cates; Glasses, Rocks, a n d Ferrous Slags; Soils; a n d Vitamins. These a r e included under P a r t I I a n d a r e con tained in 748 pages of Volume I I A a n d all of Volume I I B . I n P a r t I I , one is disappointed a t t h e lack of references t o t h e m o r e recent analytical m e t h o d s . Some commenda ble exceptions are t h e c h a p t e r s dealing with Amino Acid Analysis of Protein H y d r o l y z a t e s ; Chemical Analysis in Clinical Medicine ; a n d Vitamins. Approximately half of P a r t I of Volume I I A deals extensively with what m a y be termed the approach to an analytical problem. T h i s section m a y b e considered a n abbreviated course in fundamental analytical tech niques. One m u s t express admiration for t h e pedagogical potential a n d p r a c tical information included in a b o u t 500 pages. Within t h e whole of this sec tion, literature references are n u m e r o u s and reasonably complete. Inevitably, in a compilation of this concentration there a r e small errors of fact—e.g., t h e selectivity of certain solvent extraction methods is sometimes underextended and sometimes overextended; t h e large and useful list of "Specific a n d Selective P r e c i p i t a t i o n s " contains reagents which are seldom specific a n d only broadly selective. P r e s u m a b l y these t w o volumes a r e designed t o meet t h e needs of p r a c tising analysis a n d P a r t I I h a s accom plished this effectively t o t h e degree t h a t tried procedures a r e provided. P a r t I provides a significant q u a n t i t y of useful analytical d a t a a n d offers a condensed refresher course in t h e a p plication of b o t h classical a n d new analytical techniques. D r . Welcher h a s managed a n excel lent organization of material with a m i n i m u m of repetition. B o t h Volume I I A a n d I I B should find a place in all libraries which claim to provide analytical literature.
Characteristic Frequencies of Chemi cal Groups in the Infra-Red. M. St. C. Flett. 98 pages. American Elsevier Publishing Co., Inc., 6Z Vanclerbilt Ave., New York 17, Ν. Y. 19β3. $4.50. Section 1 of this book presents corre lation charts of t h e characteristic fre quencies from 2.8 t o 20 μ (3600 t o 500 c m . - 1 ) of chemical groups. T h e next
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Circle No. 27 on Readers' Service Card
VOL.
36, NO. 1, JANUARY 1964
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75 A
