BRINKMANN INSTRUMENTS

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BRIEFS FACTORIES

Direct Quantitative Isolation of Monocarbonyl Compounds from Fats and Oils T h e procedures were used in determining t h e carbonyl constituents of fats, oils, extracts of cheese, and whole milk powders. Theoretically all carbonyl compounds capable of forming a 2,4-dinitrophenylhydrazone under the given conditions are isolated lipide-free. D. P. SCHWARTZ, H. S. HALLER, and MARK KEENEY, Dairy Products Laboratory, Eastern Utilization Research and Develop­ ment Division, Agricultural Research Service, U. S. Department of Agriculture, Washington 25, D. C. Anal. Chem. 35, 2191 (1963)

LABORATORIES HOSPITALS EXPERIMENT

SCHOOLS

+ 150°C

+150°C

+150'

+ 150°C

+150°C

+150°C

0°C

o°c o°c

-60°C

STATIONS

0°C

—60°C

- 6 *

Critical Study of Different Methods for Determination of Chlorite Methods for the determination of hypochlorite and chlo­ rate with special reference to their behavior for chlorite determinations were studied. A procedure using am­ monium sulfate for chlorite determination was developed. M. H. HASHMI and Α. Α. ΑΥΑΖ, West Regional Laboratories, Pakistan Council of Scientific & Industrial Research, Lahore, Paki­ stan Anal. Chem. 35, 2194 (1963)

Determination of Normal Alpha-Olefins by Hydrobromination Normal alpha-olefins in olefinic mixtures within t h e C12-C18 range may be determined with a relative error of 1.3%. Normal alpha-olefins are converted by hydrobro­ mination in the presence of lauroyl peroxide to normal primary alkyl bromideii, which can be separated on M o ­ lecular Sieves. JOSEPH C. SUATONI, Gulf Pittsburgh, Pa.

Research and Development Co., Anal. Chem. 35, 2196 (1963)

Reflectance Fluorescence Spectra of Aromatic Compounds in Potassium Bromide Pellets The measurements were made in t h e concentration range of 0.00002 to 0.2 mole of solid aromatic compound per gram of K B r . For some hydrocarbons the appearance of the spectra were concentration-dependent. B. L. VAN DUUREN and C. E. BARDI, Institute of Industrial Medicine, New York University Medical Center, New York, Ν. Υ. Anal. Chem. 35, 2198 (1963)

Oxygen Determination in Rocks, Minerals, and W a t e r by Neutron Activation Two-gram samples of rocks and minerals are used to determine oxygen from the reaction O le (n,j?)N M . T h e method permits about 30 analyses per day and is nonde­ structive. Relative standard deviation is 0.39%. Inter­ ferences from F and Β in rocks are taken into account. ALEXIS VOLBORTH and Η. Ε. ΒΑΝΤΑ, Oak Ridge Institute of Nuclear Studies, Oak Ridge, Tenn. Anal. Chem. 35, 2203 (1963) <

Circle No. 150 on Readers' Service Card

MODEL "F"

HAAKE

CONSTANT TEMPERATURE CIRCULATOR The ideal circulating thermostat for today's crowded laboratories is the Haake Model " F " . Due to its light weight and compact design it can easily be moved around and occupies a minimum of space. It is ideal for any type of instrumentation or for ambu­ latory use with clinical appliances which require tem­ perature control. Some typical applications include such liquid jacketed instruments as spectrophotom­ eters, refractometers, viscometers and blood pH equip­ ment. Accuracy to ± 0 . 0 1 ° C . Pumps 2V2 g a l / m i n . Available with or without suction pump. All models are equipped with a cooling coil for control below ambient temperature and may be used at tempera­ tures to —60°c in conjunction with a heat exchanger.

BRINKMANN CANTIAGUE ROAD, W E S T B U R Y

N.Y. 1 1 5 S O

I N S T R U M E N T S Circle No. 12 on Readers' Service Card VOL. 35, NO. 13, DECEMBER 1963

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