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CONTENTS, continued

for important NEWS about FLAME

New lodometric Determination of Cobalt Based on Formation οί lodopentamminecobalt(lll) Nitrate . . . R. G. Yalman

91

Interaction of Platinum Group Elements with 1,2,3-Benzotriazole R. F. Wilson and L. E. Wilson

93

Polarographic Determination of Ferrous and Ferric Ion in Refractory Minerals G. S. Bien ând E. 0. Goldberg

97

Determination of Vapor-Liquid Ratio of Motor Gasoline. R. L Gilpin and F. W. H. Matthews

99

Sunbury

Apparatus

Assay of Picric Acid by Coulometry at Controlled Potential Louis Meites and Thelma Meites

103

Determination of Hydrogen in Titanium and Titanium Alloys Maurice Codell and George Norwitz

106

Liquid Scintillation Counter for Carbon-14 Employing Automatic Sample Alternation A . J. Weinberger, J. B. Davidson, and G. A . Ropp

110

Report on Recommended Specifications for Microchemical Apparatus. Alkoxyl A I Steyermark, H. K. Alber, V . A . Aluise, E. W. D. Huffman, E. L Jolley, J. A . Kuck, J. J. Moran, and C. L. Ogg

112

Effect of pH on High-Salt-Thorium Fluoride Titration D. F. Adams and R. K. Koppe

116

Velocity Barrier to Eliminate Absorption of Carbon Dioxide during Tîtrimetric Procedures A . M . Crestfield

117

Determination of Sulfur by Wet Combustion with Perchloric Acid PerOlof Bethge

119

Titration of Gallium with Ferrocyanide. Application of Dead-Stop End Point . . N. R. Fetter and D. F. Swinehart

122

Electronic Conversion for Graphic Recording with the Chevenard Photographically Recording Thermobalance Saul Gordon and Clement Campbell Unsaturation Determination by Acid-Catalyzed Bromination R. E. Byrne, Jr., and J. B. Johnson

126

Volumetric Determination of Selenium Silvio Barabas and W. C. Cooper

129

Coulometric Determination of Organic Bases in Acetonitrile C. A . Streuli

130

Separation of 2,4-Dinitrophenylhydrazones of Aldehydes and Ketones by Paper Chromatography . . . W. S. Lynn, Jr., L. A . Steele, and Ezra Staple

132

Co I or i metric Determination of Decaborane Using Ν,Ν-Diethylnicotinamide D. L. H i l l , E. I. Gipson, and J, F. Heacock

133

Quantitative Determination of Ethylene Glycol in Water E. R. Hess, C. B. Jordan, and H. K. Ross

134

Spectrophotometry Titration of Milligram Quantities of Barium Keith Rowley, R. W. Stoenner, and Louis Gordon

136

Corrections

PHOTOMETRY see page 17 A

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4A

75

CRYSTALLOGRAPHIC D A T A m-Aminophenyl (3-Aminophenol)

1 37

John Krc, Jr., and Ralph Hinch, Jr. CORRESPONDENCE

138

MEETING REPORT Society for Analytical Chemistry

140

AIDS FOR THE A N A L Y S T Adaptation of Beck man DU Spectrophotometer to Direct Recording Lee Cahn

141

Color Comparator for Determination of Water in Cellophane H. A . Scopp and C. P. Evans

143

Van Slylte Manometric Apparatus Modified for Determination of Free Amino Nitrogen in Solid Samples K.T. Williams and M . C . L o n g

144

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