ANALYTICAL CHEMISTRY Copyright 1951 by American Chemical Society
Volume 23, No. 5
Issued May 15, 1951
EDITOR: WALTER J. MURPHY Executive Editor: JAMES M . CROWE Assistant to Editor:
Associate Editor;
N . A . PARKINSON
Assistant
LAWRENCE T. HALLETT
Contributing Editor: Editorial
Editors
Manuscript Editing: G . GLADYS GORDON Manuscript Reviewing: STELLA ANDERSON M a k e - u p : CHARLOTTE C. SAYRE
R. H . MÜLLER
Assistants
KATHERINE I. BIGGS RUTH CORNETTE MARY R. CARLS EILEEN G. HOFFEN BETTY V. KIEFFER
Advisory
Board
S. E. Q. ASHLEY GORDON MACKINNEY K. K. CHEN C. J. RODDEN P. J . ELViNG
J . W . STILLMAN
W. A. KIRKLIN I. M. KOLTHOFF H. A. LAITINEN
W. J. SWEENEY GRANT WERNIMONTI EDWARD WICHERS
689
X-Ray Diffraction Patterns of Solid Aromatic Hydrocarbons L. J. E. Hofer and W. C. Peebles
Rapid Micro method for Alkaline Nitrobenzene Oxidation of Lignin and Determination of Aldehydes J . E. Stone and M . J. Blundell
771
690
Index of Refraction as Supplement to X-Ray Crystal Analysis of Solid Solutions L. J. Wood and A . J. Frank
Analysis of Fat Acid Oxidation Product by Countercurrent Distribution Methods K. T. Zilch and H . J . Dutton
775
695
Colorimetric Determination of Alkaloids in Tissues by Means of Methyl Orange A . O . Gettler and Irving Sunshine 779 Colorimetric Determination of Tungsten Harry Freund, M . L Wright, and R. K. Brookshier 781 Instrument for Internal Standard Flame Photometry R. H . Heidel and V . A . Fassel 784 Determination of Molybdenum in Soils and Rocks F. N . Ward 788
EDITORIALS
Determination of Sulfur in Petroleum Fractions by X-Ray Absorption
. . .
S. W . Levine and A . H. Okamoto
699
Determination of Uranium in Solution by X-Ray Absorption . T. W . Bartlett
705
Analysis of Uranium Solutions by X-Ray Fluorescence L. S. Birks and Ε. J. Brooks Characterization of Benzene Ring Substitution by Infrared Spectra
707
C. W . Young, R. B. DuVall, and Norman Wright Coordinate System for Electrophoresis . ·
709
V . L. Frampton and Κ. Ε. Harwell
715
luorome ric Determination of 2-Nitronaphthalene F. L. English and J . W . Eppert Separation and Determination of Ammonia in Methylamine Mixtures · . .
717
J. L. Gove, Harry Baum, and E. L. Stanley
721
C. H. Hale and Μ . Ν. Hale
724
Carbon on Cracking Catalyst
Geochemical Field Method for Determination of Nickel in Plants L. E. Reichen Specificity of Chromatographic Adsorbents A . L. LeRosen, P. H. Monaghan, C. A . Rivet, and E. D. Smith Effect of Side Chain on Chromatographic Adsorption of Some Ketones · . · E. D. Smith and A . L. LeRosen Determination ο Traces of Water Vapor in Gases F. E. Harris and L. K. Nash Precision Multiple Sorption-Desorption Apparatus .. . W . O . Milligan, W. C. Simpson, G . L. Bushey, H. H . Rachford, Jr., and A . L. Draper Spectrographic Determination of Nitrogen in Some Organic Nitrogen Compounds L. D. Frederickson, Jr., and Lothrop Smith Alphazurine G and Some N,N'-Substituted Benzidines as Redox Indicators R. N . Adams and E. M . Hammaker Modified Colorimetric Assay of Pteroylgfutamic Acid· R. A . Kaselis, Wladimir Leibmann, William Seaman, J. P. Sickels, E. I. Stearns, and J. T. Woods Determination of Magnesium in Plant Tissue with Thiazole Yellow H. Y. Young and R. F. Gill
727 730 732
Determination of Nitrogen Adsorption-Desorption Isotherms E. P. Barrett and L. G . Joyner
791
Evaporation Errors in Determination of Trace Concentrations of Low Molecular Weight Solutes in Carbon Tetrachloride M . R. Meeks, V . E. Whittier, and C W . Young
792
Spectrographie Determination of Silicon in Uranyl Nitrate Solutions . . . F. T. Birks Tiselius-Claesson Interferometric Adsorption Analysis Apparatus . . . . R. T. Holman and Lennart Hagdahl Micro determination of Chromium in Catgut Sutures H. V . Weiss, V . E. Siler, and P. R. Buechler Determination of Serum Iodine
. . . .
J. W. Decker and H . S. Hayden
730
Conversion of Pfund Gage Reading to Dry Film Thickness
739 742
M . H. Switzer Oxygen Removal in Polarography of Biological Solutions Charles Tanford and Jack Epstein Simple Surface Tensiometer N . B. Colthup and R. E. Torley
744
Density-Composition Relation of Mixtures of Trichlorosilane and Tetrachlorosilane R. I, Grady, J. W. Chittum, and C. K. Lyon
746
757
Apparatus and Procedure for Rapid Automatic Adsorption, Surface Area, and Pore Volume Measurement W. B. Innés
759
793 794 797 798 800 802 804 805
Scientific Apparatus Makers Meeting
809
Correction
803
CRYSTALLOGRAPHY D A T A 751
Rapid 8-Quinolinol Procedures for Determination of Magnesium A . E. Willson Determination of Scandium with 8-Quinolinol Lewis Pokras and P. M . Bernays
John Krc, Jr.
806
BOOK REVIEWS
807
THE ANALYST'S C A L E N D A R
810
754
MICROCHEMISTRY Polarographic Investigations of Reactions in Aqueous Solutions Containing Copper and Cysteine (Cystine) . . . I. M . Kolthoff and Walter Stricks
NOTES O N A N A L Y T I C A L PROCEDURES
763
Determination of Small Quantities of Niacin in Presence of Niacinamide E. G . Wollish, Morton Schmall, and E. G . E. Sharer 768
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, Editorial Headquarters, and Circulation Department, 1155 Sixteenth St., N . W., Washington 6, D. C. Advertising Office: 332 West 42nd St., N e w York 18, N . Y. Branch Editorial Offices: Chicago 4,111., Room 819, 25 East Jackson Blvd.; Houston 2, Tex., 623 West Bldg.,- N e w York 17, Ν . Υ., 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., U.S.A., 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, A c t of Oct. 3, 1917, authorized July 13, 1918. Annual subscriptions: members $3.50, nonmembers $4.00. Postage to countries not in the Pan-American Union $1.20, Canadian postage $0.35. Combina
AIDS FOR THE A N A L Y S T Distillation of Rubber Cement J. L. Been, M. M. Grover, and K. J . Ewing 813 Versatile Cell for Routine Polarographic Analysis . L. D. Frederickson, Jr. 813 Mold Growth and pH of Tartrate Buffer Solutions R.G.Bates 813 Electronic Time-Controller D. M . Peppard 814 THE ANALYST'S C O L U M N
17 A
INSTRUMENTATION
23 A
NEW PRODUCTS
31 A
MANUFACTURERS' LITERATURE
34 A
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