analytical chemistry - ACS Publications - American Chemical Society

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ANALYTICAL CHEMISTRY Copyright 1950 by American Chemical Society

Volume 22, No. 5

Issued May 16, 1950

EDITOR: WALTER J. MURPHY Executive Editor: JAMES M . CROWE Assistant to Editor: N . A . PARKINSON

Associate Editor: LAWRENCE T. HALLETT Contributing Editor: R. H . MÜLLER Editorial

Assistant Editors Manuscript Editing: G . GLADYS GORDON Manuscript Reviewing: STELLA ANDERSON Make-up: CHARLOTTE C. SAYRE

Assistants

DOROTHY M . ADAMS RUTH CORNETTE EILEEN F. GILLESPIE KATHERINE I. BIGGS BETTY V . KIEFFER

Advisory

Κ. Κ. CHEN P. J. ELVING

Board

R. H. MÜLLER B. L. OSER C. J. RODDEN

W. A . KIRKLIN I. M . KOLTHOFF

J. W. STILLMAN W. J. SWEENEY EDWARD WICHERS

H. A. LAITINEN M. G. MELLON

627

Rapid Fat Determination in Plant Control of Cacao Products . . F. X. Kobe

700

R. S. Tipson

628

Colorimetric Method (Compound 118)

Small Amounts of Aldrin A . A . Danish and R. E. Lldov

702

Purification by Fractional Melting · . J. G. Aston and S. V . R. Mastrangelo

636 Polarographic Determination of Ο,Ο-Diethyl O-p-Nitrophenyl Thiophos· phate (Parathion) C. V . Bowen and F. I. Edwards

706

EDITORIALS Theory, Scope, and Methods of RecrystalMiation

Criteria of Analytical Methods for Clinical Chemistry . . -R. M . Archibald Conversion of Refractive Dispersions to Other Wave-Length Intervals

639

for

Estimating

. . . . MICROCHEMISTRY

Albert Sankin, C. C. Martin, and M . R. Lipkin

643

Polarographic Estimation of Chloroamphenicol (Chloromycetin). G. B. Hess

649

Quantitative Determination of Certain Flavonol-3-glycosides by Paper Partition Chromatography T. B. Gage and S. H. Wender

708

651

Microdetermination of Carbon and Hydrogen in Organic Compounds . . J. J. Naughton and M . M . Frodyma

711

653

Flame Photometric Determination of Calcium in Bruciteand Magnesite· · . R. E. Mosher, E. J. Bird, and A . J. Boyle

715

654

Cellulose Ester Viscosities by Ball-Drop Method C. J . Malm, L. B. Genung, and G. B. Lapham

Microdetermination of Unsaturated Fatty Acids by Alkali Isomerization • . L. C. Berk, Norman Kretchmer, R. T. Holman, and G. O . Burr

718

656

Determination of Small Amounts of Triethylene Glycol in Air Saul Kaye with A . C. Adams

Microdetermination of Formaldehyde with Chroma tropic Acid C E. Bricker and W. A Vail

720

661

Simultaneous Spectrophotometric Determination of Cobalt, Copper, and Iron R. E. Kitson

664

Qualitative Scheme of Analysis for Common Sugars T. H. Whitehead and W. C Bradbury Conductometric Titration with Organic Reagents J. F. Corwin, A . P. Dresel, and G. E. Osuch Application of Lead Reductor to Determination of Uranium W. D. Cooke, Fred Hazel, and W. M. McNabb

NOTES O N A N A L Y T I C A L PROCEDURES

Application of Flame Spectrophotometry to Water Analysis P. W. West, Patricia Folse, and Dean Montgomery

667

Colorimetric Determination of o- and m-Dihydroxyphenols H. H. Willard and A . L. Wooten

670

Estimation of Beta-Activities from Bremsstrahlung Measurements in Ionization Chamber P. C. Tompkins, Leon Wish, and W. T. Burnett, Jr.

672

Qualitative Determination of Car boxy I k Esters R. E. Buckles and C. J. Thelen

D. J. Hiscox

72Î

H. I. Feinstein

723

lodometric Determination of Acid Value of Lac N. R. Kamath and V . B. Mainkar Microdetermination of Iodine J. W. Thomas, L. A . Shinn, H. G. Wiseman, and L. A . Moore

724 726

Polarographic Data on Zinc in Small Concentrations L. S. Champa and Abraham Wallach

676

Spectrophotometric Determination of Cinchona Alkaloids H. S. Grant and J. H. Jones

679

Determination of Potential Yeast Fermentables in Cereal Grains R. T. Wisthoff and R. J. Allgeier

681

Analysis of Data on Plastics Life Tests

684

W. L. Gore

Determination of Benzylpenicillin Identification and Microdetermination of Nickel . . . .

Direct Determination of Tin in Pig Tin

4

Silve

Kallmann

Gordon Research Conferences

Analytical Applications of 8-Hydroxyquinoline Derivatives of Gallium and Thallium Therald Moe'ller and A . J. Cohen

686

Infrared Spectrometry Determination of Deuterium Oxide in Water . . . . Vernon Thornton and F. E. Condon

690

Ferrate Oxidimetry . . J . M . Schreyer, G. W. Thompson, and L. T. Ockerman

691

CRYSTALLOGRAPHY D A T A

731 . . . .

693

Determination of Boron in Magnesite and Fused Magnesia W. M . Haze! and G. H. Ogilvie

697

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 representthe 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, Ν . Υ. Branch Editorial Offices: Chicago 4, III., Room 819, 25 East Jackson Blvd., Houston 2, Tex., 424 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 specie·• rate of postage provided for in Section 1103, Act of Oct. 3, 1917, authorized July

J. Krc, Jr., and W. C. McCrone

730

BOOK REVIEWS

731

THE ANALYST'S CALENDAR

731

AIDS FOR THE A N A L Y S T

732

THE ANALYST'S C O L U M N INSTRUMENTATION

Siloxene as Chemiluminescent Indicator in Titration Frederic Kenny and R. B. Kurtz

727 729

13 A R. H.

MJIIer17A

NEW PRODUCTS FOR ANALYSTS

23 A

INDUSTRIAL LITERATURE

27 A

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