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)
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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)
