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BRIEFS
Correspondence S p e c t r o p h o t o m e t r y D e t e r m i n a t i o n of H y d r o g e n Peroxide w i t h 8-Quinolinol I. R. COHEN and T. C. PURCELL, Laboratory of Engineering and Physical Sciences, Division of Air Pollution, Robert A. Taft Sanitary Engineering Center, Public Health Service, Cincinnati, Ohio 45226 Anal. Chem. 39. 131 (1967)
Mechanism of C o l o r Fading in t h e D i r e c t Spectrophotometric Method for Calcium Using G l y o x a l B i s ( 2 - H y d r o x y a n i l ) FREDERICK LINDSTROM and CARL W . MILLISAN, Depariment of Chemistry and Geology, Clemson University, Clemson, S. C. 29631 Anal. Chem. 39, 132 (1967)
Aids for Analytical Chemists Solid E l e c t r o d e V o l t a m m e t r y w i t h R e n e w a l of E l e c t r o d e S u r f a c e RICHARD J. LAWRANCE and JAMES O. CHAMBERS, Department of Chemistry, University of Colorado, Boulder, Colo. 80302 Anal. Chem. 39, 134 (1967)
Microcell for Obtaining Normal Contrast I n f r a r e d Solution S p e c t r a a t t h e F i v e - M i c r o g r a m Level GEORGE D. PRICE, E. C. SUNAS, and J . F. WILLIAMS, Research Department, Liggett and Myers Tobacco Co., Durham, N. C.
A TREMENDOUS LEAP FORWARD: TENNELEC TC130FET PREAMPUHER In five significant parameters, it is unsurpassed in performance, as proved by several hundred now in the field: • Low Noise • Stability • Count Rate Capability • Linearity • Dynamic Range
Anal. Chem. 39, 138 (1967)
O n - C o l u m n C o n c e n t r a t i o n of T r a c e High-Boiling Compounds f o r Q u a n t i t a t i v e G a s C h r o m a t o g r a p h i c Analysis VILHELM J . JAHNSEN, Bio-Science Laboratories, 7600 Tyrone Ave., Van Nuys, Calif. 91405 Anal. Chem. 39, 141 (1967)
Gas Chromatographic Determination of T r a c e s of W a t e r in Anhydrous A m m o n i a G . O. GUERRANT, Armour Agricultural Chemical Co., 685 DeKalb Industrial Way, Decatur, Ga. Anal. Chem. 39, 143 (1967) Circle No. 98 on Readers' Service Card -
Designed specifically for use with cooled semiconductor detectors—germanium or silicon—Tennelec's new Model TC 130 is uncompromised in performance with room temperature detectors as well. For a complete technical description, write
TENNELEC TENNELEC INSTRUMENT CO. P.O. Box D · Oak Ridge, Tennessee 3 7 8 3 0 Telephone: Area Code 6 1 5 4 8 3 - 8 4 0 4
