BRIEFS
FACTORIES HOSPITALS
Rapid Flame Photometric Determination of Alkalies in Glasses and Silicates The alkali elements in glasses and other silicates are quan titatively determined by a rapid flame photometric pro cedure. The sample is dissolved in hydrofluoric-hydro chloric acid and diluted with deionized water for flame analysis. Results are comparable with those of wet chemical and other flame analysis procedures. P. B. A D A M S , C o r n i n g Glass W o r k s , C o r n i n g , Ν . Υ .
EXPERIMENT STATIONS
SCHOOLS
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LABORATORIES
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A n a l . C h e m . 33, 1602 (1961 )
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Steroid Analyzer The apparatus, based on separation in a partition column by gradient elution, is designed for automatic quantitative determination of individual adrenocortical hormones in mixtures. F. O . A N D E R S O N , L. R. CRISP, G . C . R I G G L E , G . G . V U R E K , E R I C H H E F T M A N N , D. F. J O H N S O N , D A N I E L F R A N C O I S , a n d T. D. PERRINE, N a t i o n a l Institutes of H e a l t h , Bethesda, M d . A n a l . C h e m . 33, 1606 (1961)
Identification of Aldohexuronic Acids, Free and in Polymers A colorimetrie method is devised for determining aldo hexuronic acids, free and in polymers, without prior hy drolysis of the sample. The acids react with anthrone and indicate characteristic variations in response to time-tem perature changes. The technique distinguishes between the various aldohexuronic acids. J . R. HELBERT, Veterans A d m i n i s t r a t i o n H o s p i t a l , Downey, I I I . K. D. B R O W N , Veterans A d m i n i s t r a t i o n H o s p i t a l , Downey, I I I . , and N o r t h w e s t e r n U n i v e r s i t y M e d i c a l S c h o o l , C h i c a g o , I I I . A n a l . C h e m . 33, 1610 ( 1 9 6 1 )
Determination of Composition of Solutions of Organic Liquids by Titration with W a t e r . Application to Systems Composed of Aromatic Hydrocarbons and Lower Alcohols A titrimctrie procedure is used for determining organic liquids in an organic binary mixture. Benzene, toluene, xylene mesitylene, or p-cymene are titrated in methanol, ethanol, or isopropyl alcohol with a water reagent. Iodine is used as an indicator to render sharper end points. E. R. C A L E Y a n d A L B E R T I N E H A B B O U S H , O h i o S t a t e U n i v e r s i t y , C o l u m b u s 10, O h i o A n a l . C h e m . 33, 1613 ( 1 9 6 1 )
New Method for Determination of Refractive Indices and Study of Continuous Reactions A new and simple method is used for the determination of refractive index in liquid and solid substances. The tech nique also permits the study of continuous reactions wherein the refractive index changes with the progress of the reaction. Measurements of refractive indices may be recorded and controlled automatically. L A H J A T U R U N E N , Svenslca O l j e s l a g e r i A b , G o t h e n b u r g , Sweden A n a l . C h e m . 3 3 , 1617 ( 1 9 6 1 )
MODEL "F'
HAAKE
CONSTANT TEMPERATURE CIRCULATOR The ideal circulating thermostat for to day's crowded laboratories is the Haake Model "F". Due to its light weight and com pact design it can easily be moved around and occupies a minimum of space. It is ideal for any type of instrumentation or for ambulatory use with clinical appliances which require temperature control. Some typical applications include such liquid jacketed instruments as spectrophoto meters, refractometers, viscometers and blood pH equipment. With or without suction pump.
BRINKMANN BRINKMANN INSTRUMENTS, INC. 115 CUTTER MILL ROAD, GREAT NECK, Ν. Υ. PHILADELPHIA · CLEVELAND · HOUSTON · MIAMI • MENLO PARK, CAL. • S I LOI
Circle No. 36 on Readers' Service Card V O L 3 3 , N O . 1 1 , OCTOBER 1 9 6 1
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