CONTRIBUTED ARTICLES Quality of product and service —
SAME NEW the label —
Increasing Sensitivity of 3-Methyl-2-Benzothiazolone Hydrozone Test for Analysis of Aliphatic Aldehydes in Air. T. R. Hauser and R. L. Cummins . . 0 7 9 Methods for Determination of Cyclopropenoid Fatty Acids. Infrared Absorption Method. F. C. Magne, A. V. Bailey, E. R. McCall, S. H. Miles, and E. L. Skau 6 8 1 180° Compton Scattered-Annihilation Gamma-Ray Sum Peak Observed in Gamma-Ray Spectrometry. W. S. lyon
682
Water Determination O. F. Bennett
684
by
Gas
Chromatography.
Extraction and Spectrophotometric Determination of Molybdenum and Tungsten with 2-Thenoyltrifluoroacetone. Application to Alloy Steels. A. K. De and M. S. Rahaman 685 Determination of Carbon-14 in Halogenic Compounds by an Oxygen Flask Method. H. E. Dobbs .
687
Determination of Moisture in Foods by Gas Chromatography. W. M. Schwecke and J. H. Nelson . .
689
Separation of Certain Cations from Mixtures of Various Cations on Ion-Exchange Papers— Arsenic, Barium, Cadmium, Tin, and Zinc. Joseph Sherma 690 Indirect Volumetric Determination of Cobalt in Ferrous Alloys with EDTA as Indicated by Eriochrome Black T. G.A.Bauer
691
Loss of Cesium-137 in the Ashing of Milk Samples. R. M. Green and R. J. Finn 692 Interpretation of Linear Carrier Gas Velocity in Gas Chromatography. P. C. van Berge and Victor Pretorius
693
Aids for the Analyst Gravimetric Gas Chromatography,
Another step forward in Reeve Angel's continuing program of progress. The new labeling is designed for maximum efficiency for both dealer and consumer. Grade, size, contents, and description of the product are immediately seen and totally legible. Identification of the package is strong and unmistakable. Progress in product, performance, and p a c k a g i n g . . . .
ra
reeve angel
A new Reeve Angel catalog is being prepared. Reserve your copy —write now! Circle No. 23 on Readers' Service Card
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696
Preparation and Application of a Perfluorocarbon Vacuum Sealant, c. R. Wellman
697
Three-Compartment Cell for Polarography and Coulometry. J. M. Costa, M. S. Spritzer, and P. J. Elving 698 A
Versatile Solubility Apparatus. Stoller, and D. B. Wetlaufer
R. L. Coffin, L.
A Simplified Freezing Point Apparatus. and A. R. Glasgow
9 BRIDEWELL PLACE, CLIFTON, N. J.
6 A
E. v. Piei . . . .
ANALYTICAL CHEMISTRY
699 G. S. Ross 700
Stand-By and Operational Apparatus for Removal of Oxygen from Commercial Nitrogen. Paul Arthur 701 Pyrolytic Graphite Spectrographs Electrodes, Mooney, C. E. Schoder, and L. J. Garbini
j . B. 703
