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l*ifâkuÀVàl hm«ïnmMÈ$Ih^mÈÊÊMÈt Issued December 15,, 1948
Copyright 1948 by American Chemical Society
Volume 20, No. 12
EDITOR: WALTER J. MURPHY
Executive Editor:
Advisory
Assistant Editors
Assistant to Editor: N. A . PARKINSON
Manuscript Editing: G. GLADYS GORDON
JAMES M . C R O W E
Associate Editor: LAWRENCE T. HALLETT
Manuscript Reviewing: STELLA ANDERSON
Contributing Editor: R. H. MÜLLER
Make-up: CHARLOTTE C. SAYRE
R. P. K. K. J. R. B. L. T. R.
G.E. F. M. G. R. H. B. L. OSER W . J . SWEENEY H. H . WILLARD
CHAPMAN CHEN CHURCHILL CLARKE CUNNINGHAM
I. M, KOLTHOFF
4
EDITORIALS
1131
Symposium on Design of Experiments for Developing New Analytical Methods
ι i i Mum
Colorimetric'Determlnation of Iron with Isonitrosodimethyldihydroresorcinol S. C. Shome 1 2 0 t Spectrophotometry Determination of Iron and Titanium In Cathode Nickel · G. V . Potter and C. E. Armstrong 1206
J . C. Hintermaier
1132 1132 1136 1140 1144
Determination of Polymer in Furfural . J. C. Hillyer and A . J . Deutschman, Jr.
1146
Determination of Moisture in Some Protein Materials . . . E. A . McComb 1219
Specific Analytical Method for Certain Pyrimidines
Chemical Assay of Foods for Vitamin Ε Content . M . L. Quaife and P. L. Harris 1221 Mass Spectra of Some Organic Compounds R. H . Roberts and S. E. J . Johnsen 1226
Introductory Remarks
Grant Wernimont
Statistical Tests of Significance
J . H . Davidson
Multiple Factor Experiments in Analytical Chemistry. . . W . J , Youden Teaching Students How to Evaluate Data . P. J . Elvlns and M . G . Mellon Foundations for Experimental Design .
Colorimetric Determination of Rhenium . . A . D. Melaven and Κ. Β. Whetsel 1209 Electrical Differential Method of Measurement in Electrotitratlons Paul Delahay Application to Potentiometric Titrations
121S
Application to Conductometric Titrations
•
1215
R. G . Shepherd
1150
Radioactive Determination of Potassium in Solids A . M . Gaudin and J . H . Pennell
1154
Photometric Determination of Magnesium in Water with Brilliant Yellow . . Michael Taras
1156
Determination of Penicillin G . . . G. Β. Levy, Denman Shaw, E. S. Parkinson, and David Fergus
1159
Radioactive Electronic Detector
1162
Determination of Cobalt in Atmospheric Samples R. G . Keenan and Β. Μ . Flick 1236
Rapid Spectrophotometry Determination of Caffeine N . H . Ishler, T. P. Finucane, and Emanuel Borker
MICROCHEMISTRY
Photometric Determination of Epinephrine in Pharmaceutical Products . . . J. R. Doty Agricultural Dusts
.Irving Feuer
Semi-Self-Filling Micropycnometers
. . . . . . .
123*3
. Η . Η . Anderson 1 2 4 "
1166
>
NOTES O N A N A L Y T I C A L PROCEDURES
Preparation of Dusts of Uniform Particle Size by Fractional Sedimentation H. P. Burchfield, D. K. Gullstrom, and G . L. M c N e w
1168
Determination of Particle Size Distribution D. K. Gullstrom and H . P. Burchfield
1174
Determination of Acetone
1178
Modification of Hershberg Melting Point Apparatus for Internal Heating and Silicone Fluid F. C. Merriam 124c;
Solders and Babbitts
A . W . Danko and G . W . Wiener
Water
Determination of Surface Tension of Molten Materials
.Sidney Gutcho and E. D. Stewart
1182 1185
Artificial Color Standards for Methyl Yellow and Methyl Orange M . L. Nichols and B. L. Ingram
1188
Determination of Phenol and Structurally Related Compounds by Çibbs Method M . B. Ettinger and C. C. Ruchhoft
1191
J. K. Davis and F. E. Bartell Cozymase
. . . . . . . . . . . .
Interfacial Tension between Water and Organic Liquids Heavier Than
Determination of Residual Chlorine in Sewage . H. C. Marks and R. R. Joiner 1197
H . H . Zuidema and G . P. Pilz 1244 . R. E. Byrne, Jr. 1245
New Design of Vacuum Pressure Regulator API Symposium on Rapid Methods of Analysis
CRYSTALLOGRAPHY D A T A
.
AIDS FOR THE A N A L Y S T . . . . . THE ANALYST'S C O L U M N
Chemistry of Thorium .
1201
INSTRUMENTATION . . .
125'
