CONTENTS, continued Overcoming Effect of Manganese Dioxide in Fluoride Determinatio Samuel Deutsch
1154
Gravimetric Determination of Small Amounts oF Tellurium in Sulfur Alelcsander Aaremae and G. O . Assarsson
1155
Procedure for Routine Assay of Tritium in Water C. G . Swain, V . P. Kreiter, and W . A . Sheppard
1157
Determination of Tannins and Related Polyphenols in Foods C. J. B. Smit, M . A . Joslyn, and Aaron Lukton
1159
Rapid Microprocedure For Determination of Mercury in Biological and Mineral Materials Dorothy Polley and V . L Miller
1162
Precipitation of Cuprous Hydroxide by Ferrous Ethylenediamine Tetraacetate K. L. Chens
PRE-TEST Your Production Blending In The Lab Unique design of |»-lc twin shell blenders allows exact scale-up of lab tests to production runs Here's the one piece of blending equipment that has everything: a mixing action that blends most materials perfectly in 3 to 5 minutes . . . large access openings and smooth baffle-free interiors for fast and easy charging, discharging and cleaning . . . interchangeable shells and accessories that give exceptional versatility . . . and . . . a unique, patented design that provides identical mixing results in all sizes, from one pint lab models up to 500 cu. ft. production units. |>4c twin shell lab blenders are used for small production runs as well as research in hundreds of plants. Priced low and available from stock. Dust-tight, corrosion and abrasion-resistant Lucite shells are standard. Also available in stainless steel. L i g h t w e i g h t cast a l u m i n u m b a s e h a s sturdy grey crackle finish, adjusts for 4 and 8 quart shells and yokes. G.E. motor is 1/20 H P , single phase, 115 volts, 60 cycle, AC. Chain guard furnished. Yoke Model holds t w o 1-quart or 1pint shells, or one o f e a c h , or o n e 2 - q u a r t shell w i t h e i t h e r , or a d a p t s into a s t a n d a r d 4 or 8 quart blender. Handles t w o jobs at once.
• . .
1165
Ceriometric Determination of Sugars A . A . Forist and J. C. Speck, Jr.
1166
Determination of Trace Amounts of Carbonyl Sulfide in Gaseous Hydrocarbons R. E. Snyder and R. O . Clark
1167
Determination of Lead in Urine W. M . McCord and J. W. Zemp
1171
Standardization of Sulfuric A c i d against Sodium Carbonate E. W. Balis, L B. Bronk, H. A . Liebhafsky, and H . G. Pfeiffer
1173
Interferences in Titanium Sulfate Method for Hydrogen Peroxide C. N. SatterField, and A . H. Bonnell
1174
Determination of Titanium in Titanium Metal R. A . Papucci
1175
Nonaqueous Titration of Dilute Acids and Bases in Acrylonitrile M . L. Owens, Jr., and R. L. Maute
1177
Circular Paper Chromatographic Method for Estimation of Thiamine and Riboflavin in Multivitamin Preparations K. V . Giri and S. Balakrishnan
1178
Barite Analysis with X-Ray Spectrograph L. B. Gulbransen
1181
Determination of Organic Substances by Standard Chromous Chloride Solution R. S. Bottei and N. H. Furman
1182
Precise Determination of Chloride in Plasma by Differential Potentiometric Titration V . P. Dole and N . A . Thorn
1184
Spectrophotometry Determination of Ruthenium G. A . Stoner
1186
Application of Volhard Titration to 2-Ethyl-1 -Hexanol Separation Method for Determination of Lithium J. C. White and Gerald Goldberg
1188
Location of Symmetric Peaks by Simple Least Squares Method W. S. Horton
1190
Routine Exchange Capacity Determinations of Ion Exchange Resins Sa Mie Fisher and Robert Kunin
1191
Weighing Titanium(IV) Chloride for Quantitative Chemical Analysis I. J. Dzikowski and R. G. Novak
1194
Spectrophotometry Determination of Serum Copper with Biscyclohexanoneoxalyldihydratone . . . . R. E. Peterson and M . E. Bollier
1195
Colorimetric Coulometer T. C. Franklin and C. C. Roth
1197
Determination of Small Amounts of Chlorate in Ammonium Perchlorate Chaim Eger
1199
Spectrophotometry Determination of Nickel in Tungsten Powder K. L. Rohrer
1200
CRYSTALLOGRAPHY
DATA 1203
D-Fructose 2,4-Dinïtrophenylhydrazone Pyridine Solvate F. T. Jones, D. R. Black, and L. M . White MEETING REPORTS Society for Applied Spectroscopy
1204
Society for Analytical Chemistry
1206
AIDS FOR THE A N A L Y S T
Intensifier Bar Model gives particularly intense local m i x i n g action, breaking up lumps, dispersing liquids into solid mixes.
Write for |>-k catalog 13. The Patterton-Kelley Co., Inc., 2 3 7 0 Lackawanna Avenire, Eo»t Stroudtburg, Pa.
PATTERSON-KELLEY Offices: New York, Chicago, Philadelphia, Boston and other principal cities Circle Ne. 4 A an Readers' Service Card, page 37 A
4A
All-Glass Rotary Film Evaporator M . E. Volk
1207
Matched Test Tubes in Beckman DU Spectrophotometer B. E. Saltzman
1 207
G U I D E FOR A U T H O R S , published in December 1954 issue, page 2032, gives copy requirements w h i c h should be observed in preparing manuscripts for editorial consideration. Manuscript (2 copies) should be submitted t o the Editor, 1155 Sixteenth S t . , N . W . , W a s h i n g t o n 6,-D. C. T h e American Chemical Society assumes no responsibility for the statements and opinions advanced by contributors t o its publications. Views expressed in the editorials arc those of the editors and do not necessarily represent the official position of t h e American Chemical Society. Published m o n t h l y by the American Chemical Society, from 20th and N o r t h a m p t o n Sts., E a s t o n , Pa. Executive Offices, Editorial Headquarters, and Circulation D e p a r t m e n t , 1155 Sixteenth St., N . W . , W a s h i n g t o n 6, D. C. Advertising Office: 430 Park A v e . , New York 22, N . Y . Branch Editorial Offices: 86 East R a n d o l p h St., Chicago 1, 111.; 623 West BIdg., H o u s t o n 2 , T e x . ; 2 P a r k Ave., N e w York 16, N . Y . ; 703 Mechanics' Institute BIdg., San Francisco 4, Calif.; Bush House, A l d w y c h , L o n d o n . Entered as second-class matter at the Post Office at E a s t o n , Pa., U.S.A., February 18, 1948, under the Act of M a r c h 3, 1879Annual subscriptions: members $4.00, nonmembers $5.00. Postage t o countries n o t in the Pan-American Union $1.20. Canadian postage $0.35- Single copies: current issues, $1.00 ( A p r i l , issued in t w o parts, priced at $2.00). Claims for missing numbers will n o t be allowed if received more than 60 days from date of mailing plus time normally required for postal delivery of journal and claim. N o claims allowed from subscribers in Central Europe, Asia, or the Pacific Islands o t h e r t h a n H a w a i i , or because of failure to notify the Circulation Department of a change of address, or because copy is "missing from files." C H A N G E O F ADDRESS: Notify Circulation D e p a r t m e n t , American Chemical Society, 1155 Sixteenth St., N . W . , W a s h i n g t o n 6, D . C. Such notification should include both old and new addresses and postal zone number, if any. T h e American Chemical Society also publishes- Industrial and Engineering Chemistry, Chemical and Engineering News, Chemical Abstracts, Journal of the American Chemical Society, Journal of Physical Chemistry, Journal of Agricultural and Food Chemistry, and the Journal of Organic Chemistry. Rates on'request.
ANALYTICAL
CHEMISTRY
