ANALYTICAL CHEMISTRY Copyright 1948 by American Chemical Society
Volume 20, No. 6
Issued June 15, 1948
EDITOR: W A L T E R J. M U R P H Y Assistant
Assistant to Editor: N . A . PARKINSON
Editors
Executive Editor: JAMES M . CROWE
Manuscript Editing: G . GLADYS GORDON
Associate Editor: LAWRENCE T. HALLETT
Manuscript Reviewing: STELLA ANDERSON
Contributing Editor: R. H . MULLER
Make-up: CHARLOTTE C. SAYRE
EDITORIAL
497
Radioactive Contaminants in Tracers . . . .
W . E. Cohn
Advisory Board R. P. CHAPMAN G. E. F. LUNDELL K. K. CHEN M. G. MELLON J. R. CHURCHILL R. H . MÜLLER B. L. CLARKE B. L. OSER T. R. CUNNINGHAM w. J. SWEENEY I. M. KOLTHOFF H. H. WILLARD
Precipitation of Oxalates from Homogeneous Solution . . Louis G o r d o n and E. R. Caley
560
Analysis of Simple and Complex Tungsten Carbides . . . J . J . Furey and T. R. Cunningham
563
Determination of Deuterium in Water R. B. Fischer, R. A . Potter, and R. J . Voskuyl
571
498
Determination of Silica in Presence of Fluorine and Phos phorus J . A . Brabson, H . C. Mattraw, G . E. M a x w e l l , Anita Darrow, and M . F. Needham
504
Spectroscopic Determination of Cyclopentadiene and Methylcyclopentadiene . . J . S. Powell and K. C. Edson
510
Determination of Major Constituents of Cedar O i l Vapor in Cedar Chests . . . . F. W . Hayward and R. B. Seymour
572
Determination of Thiophene, Carbon Oxysulfide, and Car bon Disulfide in Producer Gas L. J . Brady
512
Gas Analysis Apparatus Employing Velocity of Sound . . C. E. Crouthamel and Harvey Diehl
Determination of Alumina in Iron O r e G . F. Smith and F. W . Caqle, Jr.
574
515
Determination of Refractive Index of Polymers R. H . W i l e y and P. H . H o b s o n
520
J . H . L. Watson
576
Measurement of Adherence of Organic Coatings to Metal Surfaces Henry Green and T. P. Lamattina
523
Amperometric Microtitration of Diamidines . J . B. Conn
585
Spirit Beverages
527
Microdetermination of Sulfur in Organic Compounds . . A I Steyermark, Esther Bass, and Bella Littman
587
J . F. Williams and E. F. Kenney
Determination of Acetylene in Gas J . A . Shaw and Elton Fisher Spectrophotometric Estimation of Tryptophan D. C. Carpenter
533
536
Rapid Estimation of Citrus Peel O i l E. M . Burdick and J . S. A l l e n .
539
Polarographic and Amperometric Determination of Barium I. M . Kolthoff and H . P. Gregor
541
S. H . Maron and Benjamin M a d o w
545
Laboratory Evaluation of O i l Deterioration . . R. G . Larsen
547
Frequency Errors in Timing with Electric Clocks
Spectrochemical Determination of Copper . . W . M . Spicer Procedure for Measurement of P 31 and P 32 in Plant Material . A . J . MacKenzie and L. A . Dean
Particle Size Determinations with Electron Microscopes
NOTES O N A N A L Y T I C A L
PROCEDURES
Action of Nessler's Reagent on Amines H . A . Liebhafsky and L. B. Bronk
588
Apparatus for Absorption of Carbon Dioxide in Mass Spectrometric Determination of Carbon Isotopes . . . Kalervo Rankama and K. J . Neuvonen
589
Microdetermination of O - A c e t y l Groups . J . F. A l i c i n o
590
Photoelectric Determination of Color of Corn Sirup . . . B. L. Sea 11 et
Preparation of Dried Latex Films
R. S. Craig, C. B. Satterthwaite, and W . E. Wallace
MICROCHEMISTRY
555 557
591
BOOK REVIEWS
592
CORRESPONDENCE
592
CRYSTALLOGRAPHY DATA
593
ANALYST'S CALENDAR
595
AIDS FOR THE ANAYST THE ANALYST'S COLUMN INSTRUMENTATION
596 17A R. H . M i i l l e r 21 A
559
The American Chemical Society assumes no responsibility for the statements and opinions advanced by contributors to its publications. Views expressed in the editorials are those of the editors and do not necessarily represent the official position of the American Chemical Society. Published by the American Chemical Society, from 20th and Northampton Sts., Easton, Pa. Executive Offices and Editorial Headquarters, 1155 Sixteenth St., N. W., Washington 6, D. C. Advertising Office: 332 West 42nd St., N e w York 18, Ν . Υ. Branch Editorial Offices: Chicago 4, III., Room 819, 25 East Jackson Blvd.; Hous ton 2, Tex., 413 West Bldg.,- N e w York 17, 60 East 42nd St.; San Francisco 2, Calif., Room 454, 760 Market St. Entered as second-class matter at the Post Office at Easton, Pa., February 18, 1948, under the A c t of March 3, 1879, as 12 times a year monthly on the 15th. Acceptance for mailing at special rate of postage provided for in Section 1103, Act of Oct. 3, 1917, authorized July 1 3 , 1 9 1 8 . Annual subscrip
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