HIGHLIGHTS OF T H E SCIENTIFIC A N D T E C H N I C A L A R T I C L E S IN THIS ISSUE
AC BRIEFS Modulation Technique for Neutron Capture Gamma Ray Measurements in Activation Analysis Two series of measurements of short duration, that of background and of sample, with a modulation technique using a high-speed chopper were made. The two halfcycles of copper were corrected for background and then subtracted to give the prompt gamma spectrum.
Continuous EDTA Titrations a t Low Concentrations Methods which include automatic blank correction and direct readout were developed permitting potentiometric E D T A titrations to be performed on a routine basis at sample concentrations of 10"M. W . J . BLAEDEL and R. H . L A E S S I G , Department University of Wisconsin, Madison, W i s . 53706
T. L. ISENHOUR and G. H. MORRISON, Department of Chem istry, Cornell University, Ithaca, Ν. Υ.
of
Chemistry,
A n a l . C h e m . 38, 186 ( 1 9 6 6 )
Anal. Chem. 38, 162 (1966)
Determination of Boron by Thermal Neutron Activation Analysis Using a Modulation Technique By irradiation of the sample with a modulated neutron beam 7coupled with gamma ray spectrometry, the B M (η,α) Li ™ (7'i/2 = 5 χ ΚΓ1* second) reaction can be ap plied to the direct analysis of boron. The approach is also applicable to other short-lived reactions. T. L. I S E N H O U R and G . H . M O R R I S O N , istry, Cornell University, Ithaca, Ν . Υ .
Department
of Chem-
Rapid Determination of Lead-210 and Polonium-210 in Environmental Samples by Deposition on Nickel The optimum conditions for the spontaneous deposition of Po21° and Bi210 on nickel from HC1 solutions were de termined. The average efficiencies for the deposition of Po210, Bi210, and Pb 210 were 96 ± 4%, 94 ± 3 % , and 13 ± 2%. R I C H A R D L. B L A N C H A R D , U. S. Department of H e a l t h , Edu cation, and W e l f a r e , Robert A . Taft Sanitary Engineering Center, Cincinnati, O h i o A n a l . C h e m . 38, 189 ( 1 9 6 6 )
A n a l . C h e m . 38, 167 ( 1 9 6 6 )
Influence of Spherical Diffusion on the Alternating Current Polarographic W a v e Results of the study support the proposal t h a t spherical diffusion can influence significantly the a.c. polarographic wave even when the d.c. process is reversible. J O S E P H R. D E L M A S T R O and D O N A L D E. S M I T H , of Chemistry, Northwestern University, Evanston, I I I .
Proton Nuclear Magnetic Resonance Studies of Several Polyalcohols, Hydroxy Acids, and Derivatives of D-Gluconic Acid N M R spectra were recorded as a function of solution pH. The proton N M R spectra for gluconic acid and related compounds are summarized.
Department D O N A L D T. S A W Y E R and J A M E S R. B R A N N A N , Department of Chemistry, University of C a l i f o r n i a , Riverside, C a l i f .
A n a l . C h e m . 3 8 , 169 ( 1 9 6 6 ) A n a l . C h e m . 38, 192 ( 1 9 6 6 )
Cyclic Voltammetry of Some Iron Porphyrin Complexes Iron porphyrin complexes with pyridine and cyanide ion were investigated at a stationary platinum electrode. Ligand exchange reactions occurring after electron trans fer were characterized and their rates measured. D O N A L D G . D A V I S and D A N I E L J . O R L E R O N , Department of Chemistry, Louisiana State University in N e w Orleans, N e w Orleans, La. 70122
Mass Spectrometric Analysis of Boron Trifluoride Memory effects resulting from sample sorption on the surfaces of the inlet system and ion source are reduced by applying a correction factor. J . C . H O R T O N , Technical Division, O a k Ridge Gaseous Diffusion Plant, Union C a r b i d e Corp., Nuclear Division, O a k Ridge, Tenn. A n a l . C h e m . 38, 198 ( 1 9 6 6 )
A n a l C h e m . 38, 179 ( 1 9 6 6 )
Polarographic Reduction of Oxygen in Dimethylsulfoxide Investigation of the acidic impurity effect on the reduc tion in the presence of proton sources is reported. E D W A R D L. J O H N S O N , K A R L H . P O O L , and R A N D A L L E. H A M M , Department of Chemistry, Washington Sta+e University, Pullman, W a s h . 99163 A n a l . C h e m . 38, 183 ( 1 9 6 6 )
Calibration Techniques f o r X-Ray Fluorescence Analysis of Thin Nickel-Chromium Films A monochromatic x-ray absorption technique, optical interferometric thickness measurements, and colorimetric analyses are compared. N. SPIELBERG and G. ABOWITZ, cliff Manor, Ν. Υ. Ι05Ι0
Philips Laboratories,
Briar-
Anal. Chem. 38, 200 (1966) VOL. 38, NO. 2, FEBRUARY 1966
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11
A
AC BRIEFS Spectrophotometric Determination of Ruthenium with l-Nitroso-2-Naphthol
Use of α Continuous Source in Flame Fluorescence Spectrometry Copper, silver, gold, bismuth, magnesium, zinc, cadmium, mercury, and thallium exhibited relatively intense atomic flourescence in flames excited by a 150-watt xenon arc continuous source.
Microgram amounts of ruthenium (0.005 to 0.1% in zinc-magnesium alloys) in carbon tetrachloride solution are determined by measurement of the absorbante of its l-nitroso-2-naphthol complex at 645 microns.
CLAUDE VEILLON, J . M. MANSFIELD, M. L PARSONS, and J. D. WINEFORDNER, Department of Chemistry, University of Florida, Gainesville, Fla. Anal. Chem. 38, 204 (1966)
GWENDOLYN KESSER, R. J . MEYER, and R. P. LARSEN, Argonne N a t i o n a l Laboratory, Chemical Engineering Division, 9 7 0 0 South Cass A v e . , Argonne, I I I . 6 0 4 4 0
Fractionation and Characterization of Low Molecular Weight Asphaltic Hydrocarbons
Preconcentration and Spectrographs Determination of Ultratrace Metallic Impurities in Potassium Chloride Parts-per-billion concentrations of 39 elements were de termined spectrographically after preconcentration by carrier precipitation with 8-quinolinol, thionalide, and tannic acid. M. C. FARQUHAR, J. A. HILL, and M. M. ENGLISH, Trona Research Laboratory, American Potash & Chemical Corp., Trona, Calif. Anal. Chem. 38, 208 (1966)
Diphenylpicrylhydrazyl as an Organic Analytical Reagent in the Spectrophotometric Analysis of Phenols Decrease in the violet color of diphenylpicrylhydrazyl is used as a measure of the quantity of phenol present. The solvent used influences the reaction rate. G . J . P A P A R I E L L O and M . A . M . J A N I S H , Research ment, C I B A Pharmaceutical Company, Summit, N . J .
A n a l . C h e m . 38, 221 ( 1 9 6 6 )
Depart
A n a l . C h e m . 38, 211 ( 1 9 6 6 )
Spectrofluorometric Trace Determination of Trivalent Samarium, Europium, Terbium, and Dysprosium in Sodium Tungstate Solutions Maximum fluorescence intensity is obtained by irradiat ing, at 265-270 ταμ, lanthanides dissolved in 0.6M sodium tungstate solution with a final p H of 9 and a tempera ture of 20° C. Sensitivity is 10"1 to 10"3 ^g./ml. G I U L I O ALBERTI and M . A . M A S S U C C I , Laboratorio di Chimica delle Radiazioni e Chimica Nucleare del C N E N , Istituto di Chimica G é n é r a l e ed Inorganica, Universîta di Romà, Italy
30 fractions from three commercial asphalts were studied by physical constant-structure correlation procedures and by ultraviolet, infrared, and N M R spectral methods. D. E. W E T M O R E , C . K. H A N C O C K , and R. N . TRAXLER, C h e m istry Department, Texas A & M University, C o l l e g e Station, Texas. A n a l . C h e m . 38, 2 2 5 ( 1 9 6 6 )
Isolation and Identification of C J 3 to C 1T Alkylnaphthalenes, Alkylbiphenyls, and Alkyldibenzofurans from the 275° to 305° C. Dinuclear Aromatic Fraction of Petroleum Eight Cis alkylnaphthalenes, seven Cu alkylnaphthalenes, five C14 alkylbiphenyls, four d e alkylbiphenyls, four dibenzofurans, and fluorene were isolated or identified. Methods were developed for identification from N M R spectra for the compounds for which physical and spectrometric properties were not available. F O C H F U - H S I E Y E W and BEVERIDGE J . M A I R , Petroleum Re search Laboratory, Carnegie Institute of Technology, Pittsburgh 13, Pa. A n a l . C h e m . 38, 231 ( 1 9 6 6 )
Gas Chromatographic Analysis of Solvent Used in Reactor Fuel Reprocessing and Fission Product Recovery Retention data and column characteristics of tributyl phosphate, dibutyl butyl phosphonate, di(2-ethyl hexyl)phosphate, trioctyl phosphine oxide, and tertiary amines and straight chain hydrocarbons from Ce to Cm were studied. M I L T O N H . C A M P B E L L , General Electric C o . , Richland, W a s h . A n a l . C h e m . 38, 237 ( I 9 6 6 )
A n a l . C h e m . 38, 2 1 4 ( 1 9 6 6 )
Near-Infrared Method f o r Analysis of Block and Random Ethylene-Propylene Copolymers A group of ethylene-propylene copolymers consisting of bisegment block, multisegment block, and random copolymers as well as a mixture of the homopolymers was studied. T h e analysis is applicable to all types of ethylene-propylene copolymers and mixtures up to at least 40% ethylene. R. M . BLY, P. E. KIENER, and B. A . FRIES, Chevron Research C o . , Richmond, C a l i f . Anal. Chem. 38, 217 (1966) -< -
