A C BRIEFS Highlights of Articles in This Issue
Computer Analysis of Unresolved Non-Gaussian Gas Chromatograms by Curve-Fitting
Overlapping chromatographic peaks whose shapes are not necessarily expressible by an analytic function such as Gaussian are analyzed by computer so as to give accurate quantitative analyses. ANDREW H. ANDERSON, TERENCE C. GIBB, and ANTHONY B. LITTLEWOOD, School of Chemistry, The University, Newcastle upon Tyne, England NE1 7RU.
Inert Carrier-Gas Fusion Determination of Total Nitrogen in Rocks and Meteorites An inert carrier-gas extraction-gas chromatography technique with modification is employed for the determinations of total nitrogen content in terrestrial rocks and meteorites. EVERETT K. GIBSON, JR., and CARLETON B. MOORE, Center for Meteorite Studies and Department of Chemistry, Arizona State University, Tempe, Ariz. 85281
Anal. Chem., 42, 461 (1970)
Anal. Chem., 42, 434 (1970)
Analytical Separation and Analysis of a Multicomponent System by Electron ¡Paramagnetic Resonance
Anion Exchange Separation for the Determination of Uranium in Complex Solutions
Method for the separation and quantitative determination of Fe(III), Cu(II), VO2*, Mn(II), Cr(III), and Gd(III) based on the linear relationship between the first derivative absorption curve intensity and the concentration of the metal ion present in solution.
Two anion-exchange separations of uranium from aluminum nitrate or hydrochloric acid solutions on Dowex 1-X8 resin Uranium in nuclear fuel solutions is sepaare reported. rated, eluted, and determined by dichromate titration.
GUILBAULT and E. S. MOYER, Louisiana State University in New Orleans, Department of Chemistry, Lakefront Campus, New Orleans, La. 70122 G. G.
O. A. VITA, C. R. WALKER, C. F. TRIVISONNO, and R. W. SPARKS, Goodyear Atomic Corp., Box 628, Piketon, Ohio
45661 Anal. Chem., 42, 465 (1970)
Anal. Chem., 42, 441 (1970)
Selectivity Characteristics of a Calcium-Selective Ion-Exchange Electrode in the System Calcium(ll)-Sodium(l)-^Chloride(l)—Water
Two Methods for Separation of Surface- and Bulk Gases in Vacuum-Fusion Analysis of Metals
This paper shows how selectivity isotherms can be used to concisely summarize the characteristics of liquid exchangers. A method of predicting selectivities is also outlined.
For meaningful measurements of low gas contents in metals, it is necessary to separate surface gas from bulk gas. A mathematical and a physical separation were applied to copper, chromium, and tungsten.
MICHAEL WHITFIELD and J. V. LEYENDEKKERS, Division of Fisheries and Oceanography, CSIRO, Cronulla, N.S.W. 2230, Australia Anal. Chem., 42, 444 (1970)
KEITH W. GUARDIPEE, Westinghouse Research Laboratories, Beulah Road, Churchill Boro., Pittsburgh, Pa. 15235 Anal. Chem., 42, 469 (1970)
Analysis of Inorganic Sulfur Compounds by Flame Ionization Detector Certain inorganic sulfur compounds can be determined using the normal flame ionization detector in gas chromatography depending on oxygen-hydrogen balance, the presence of hydrocarbons in the flame, and the temperature of the burner jet,
Electrochemical Study of Exchange Reactions of Mercuric Sulfide Monolayers The purpose of this study was to determine the properties of sulfide exchange between mercuric sulfide and selected transition metal cations. J. H. CARNEY and H. A. LAITINEN, Department of Chem-
Department of Chemistry, Royal Australian Air Force Academy (University of Melbourne), Point Cook, Victoria, Australia Anal. Chem., 42, 448 (1970)
istry and Chemical Engineering, University of Illinois, Ur-
Digitization of Time-of-Flight Mass Spectra A technique for digitizing mass spectra from a time-of-flight
Mechanistic Studies on Crystal-Membrane Ion-Selective Electrodes
B. A. SCHAEFER,
mass spectrometer is described. Mass numbers are calculated from the equations for the time-of-flight of an ion using the gate driving voltage from the analog scanner as a time base.
. A. GRAYSON and R. J. CONRADS, McDonnell Research Laboratories, McDonnell Douglas Corp., St. Louis, Mo. 63166 Anal. Chem., 42, 456 (1970)
bana, III. 61801
Anal. Chem., 42, 473 (1970)
The mechanism of response of ion selective electrodes with single crystal, polycrystalline, and mixed crystal membranes is considered with regard to ion transport across the membrane and capacitance at its interfaces. M. J. D. BRAND and G. A. RECHNITZ, Chemistry Department, State University of New York, Buffalo, N. Y. 14214
Anal. Chem., 42, 478 (1970)
ANALYTICAL CHEMISTRY, VOL. 42, NO. 4, APRIL 1970
.
11 A
AC
BRIEFS
Chronoamperometric Investigation of Iodide Oxidation Reactions
Thorium(IV)-8-Quinolinol ComplexesRe-examination of Their Composition
Oxidations of iodide and triiodide at platinum electrodes studied with triangular-wave chronoamperometry. Iodide is converted to triiodide by a third-order electrode reaction in acetonitrile and in water.
The orange Th (IV) -S-quinolinol material precipitated from slightly acidic aqueous solution is a nonstoichiometric mixture of
