Contributed Articles Phosphorescence Study of Excited Triplet State Proper ties of Some Κ Vitamins and Their Analytical Usefulness. J. J. Aaron and J. D. Winefordner 2122
Direct Volatilization-Spectral Emission Type Detection System for Nanogram Amounts of Arsenic and Antimony. R. S. Braman, L. L. Justen, and C. C. Foreback 2195
Analytical Study of the Phosphorescence of Purines in Aqueous Solution at 77 °K. J. J. Aaron and J. D. Wine fordner 2127
Determination of Phosphate, Silicate, and Sulfate in Natural and Wastewater by Atomic Absorption Inhibition Titration. C. I. Lin and C. 0. Huber 2200
Fluorescence Spectrometry in the Characterization of High-Boiling Petroleum Distillates. J. F. McKay and D. R. Latham 2132
Determination of Wear Metals in Engine Oils by Atomic Absorption Spectrometry with a Graphite Rod Atomizer. R. D. Reeves, C. J. Molnar, M. T. Glenn, J. R. Ahlstrom, and J. D. Winefordner 2205
Determination of Rare-Earth, Yttrium, and Scandium Abundances in Rocks and Minerals by an Ion ExchangeX-Ray Fluorescence Procedure. G. N. Eby 2137
High Speed Liquid Chromatography of Derivatized Uri nary 17-Keto Steroids. F. A. Fitzpatrick, Sidney Siggia, and Joseph Dingman, Sr. 2211
Determination of Trace Amounts of Iron(ll) Using Chemiluminescence Analysis. W. R. Seitz and D. M. Hercules 2143
Notes Gravimetric and Coulometric Analysis of Beryllium Sam ples Using 2-Methyl-8-Quinolinol. J. R. Bacon and R. B. Ferguson 2149 Application of Coulostatic Charge Injection Techniques to Improve Potentiostat Risetimes. J. E. Davis and Nicholas Winograd 2152 Automated Determination of Permanganate and Dichromate Using a Porous Catalytic Oxygen Electrode. B. Fleet, A. Y. W. Ho, and J. Tenygl
Aggregation Studies of Some Nuclear Magnetic Reso nance Shift Reagents by Vapor Phase Osmometry. J. F. Desreux, L. E. Fox, and C. N. Reilley 2217 GINA—A Graphical Interactive Nuclear Magnetic Reso nance Analysis Program. S. R. Heller and A. E. Jacobson 2219 Anodic Voltametry of Some Aromatic Amines in Chloro form. Absorption Spectra and Association Phenomena of the Corresponding Cation Radicals. Georges Cauquis and Denis Serve 2222
Enzyme Electrodes Based on the Use of a Carbon Dioxide Sensor. Urea and L-Tyrosine Electrodes. G. G. Guilbaultand F.R.Shu 2161 Electrosorption and Separation of Quinones on a Column of Graphite Particles. J. H. Strohl and K. L. Dunlap 2166 Determination of the Acid or Base Content of Organic Compounds Using Nuclear Magnetic Resonance Spec trometry. Yair Dagani and Abraham Patchornik 2170 Classification of Archaeological Artifacts by Applying Pattern Recognition to Trace Element Data. B. R. Kowalski, T. F. Schatzki, and F. H. Stross 2176 Graphic Representation of Nuclear Magnetic Resonance Chemical Shifts for the Olefinic Protons. Osamu Yamamoto, Masaru Yanagisawa, Hiroshi Tomita, Tomoko Ogawa, Yoshie Senga, Kikuko Hayamizu, and Fumiko Taka 2180 Elemental Analysis of Single Micrometer-Size Airborne Particulates by Ion Microprobe Mass Spectrometry. J. A. McHugh and J. F. Stevens 2187 Anomalous Absorption Bands in Ultraviolet Spectra of HalideSolutions. Arra Nergararian and L. H. Berka 2192
Electrochemical Study of Oxidation of Fractional Mono layer Gold Films on Platinum. S. H. Cadle and Stanley Bruckenstein 2225 Electrode Indicator Technique for Measuring Low Levels of Cyanide. M. S. Frant, J. W. Ross, Jr., and J. H. Riseman 2227 Some Characteristics of Several Commercially Available Cation-Responsive Glass Electrodes. Sonny Phang and B.J. Steel 2230 Electrochemical Reduction of Mercury(l)and Mercury(ll) on Platinum in Fused Sodium-Potassium-Nitrate Eutecticat250°C. H. S. Swofford, Jr., and James Dietz 2232 Negative Ion Mass Spectrometry—A New Analytical Method for the Detection of Trinitrotoluene. J. Yinon, H.G. Boettger, and W.P.Weber 2235 Programmed Temperature Gas Chromatography of Boron Hydrides. E. J. Sowinski and I. H. Suffet 2237 Digitization Errors in the Measurement of Statistical Moments of Chromatographic Peaks. S. N. Chesler and S. P. Cram 2240
ANALYTICAL CHEMISTRY, VOL. 44, NO. 13, NOVEMBER 1972
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Contributed Articles
the only precise way to measure organic carbon from
