Contributed Articles Gas-Liquid Chromatographic Separation and Spectrometric Identification of Nitrogen Bases in Hydrocracked Shale Oil Naphtha. Denn/s Brown, D. G. Earnshaw, F. R.
trometry. J.
Variables in Oxygen-18 Isotopic Analysis by Mass SpecW. Taylor and /-Jen Chen
224
Characterization of Electrode Reversibility by Pulse Polarography. ,K. B. Oldham and E. P. Parry
229
146
McDonald, and . B. Jen sen
Features of the Modified Coveil Method for Computation of Total Absorption Peak Areas in Complex Gamma-Ray Spectra. Slawomir Sterllnski
Fast Radiochromatographic Detection of Tritium with Liquid Scintillators at Low Temperatures. Svein Prydz, T. B. Meló, J. F. Koren, and E. L. Eriksen
151
156
Rate-Controlled Adsorption of Product in Stationary Electrode Polarography. . H. Hulbert and Irving Sham
162
Use of Energy Transfer in Luminescence Analysis. Determination of Aromatic Carbonyl Compounds. S. R. Abbott and D. M. Hercules
171
A Rapid, Nondestructive Technique for Infrared Identifi-
cation of Crude Oils by Internal Reflection Spectrometry. Qualitative Differentiation of Crude Oils Originating from Natural Seepages and Platform “A” in the Santa Barbara Channel. J. S. Mattson, . B. Mark, Jr., R. L. Kolpack, and C. E. Schutt
234
Differential Constant-Current Potentiometry for Analysis by Kinetics. J. R. Sand and C. O. Huber
238
Direct Current and Alternating Current Polarographic Response of Some Pharmaceuticals in an Aprotic Organic Solvent System. A. L. Woodson and D. E. Smith
242
Gas Chromatography and Thermodynamics of Divinyl-
benzene Separations on 4,4'-Dihexoxyazoxybenzene Liquid Crystal. W. L. Zielinski, Jr., D. H. Freeman, D. E. Marti re, and L. C. Chow
Identification of Polycyclic Naphthenic, Mono-, and Diaromatic Crude Oil Carboxylic Acids. W. K. Seifert and R. M. Teeter
180
Gas-Solid Chromatography Using Various Thermally Activated and Chemically Modified Silicas. D. F. Cadogan and D. T. Sawyer
190
J. M. Hogan, R. A. Engel, and H. F. Stevenson
249
Differential Scanning Solid State Reaction Kinetics. Calorimetric Determination of the Solid State Decomposition Kinetics and Activation Parameters of N-ArylN'-Tosyloxydi-lmide N-Oxides. E. A. Dorko, R. S. Hughes, and C. R. Downs
253
Instrumental Neutron Activation Analysis of Atmospheric Pollutants Utilizing Ge(LI) 7-Ray Detectors.
Column Parameters in Thermal Field-Flow Fractionation. . E. Hovlngh, G. H. Thompson, and J. C. Giddings
195
Development and Characterization of Ion-Exchange Bead Microstandards. D. H. Freeman, L. A. Currie, E. C. Kuehner, H. D. Dixon, and R. A. Paulson
203
Preparation of Isotopic Oxygen Targets for Charged Particle Activation Analysis. J. F. Lamb, D. M. Lee, and S. S. Markowitz
Internal Standard Technique for the Gas Chromatographic Determination of Water in Liquids.
A Versatile
176
257
W. H. Zoller and G. E. Gordon
Notes Cadmium Determination in Biological Tissue by Neutron Activation Analysis. K. W. Lieberman and . H. Kramer
266
267
209
Surface Profile Analysis by Helium-3 Activation; Oxygen in Silicon. J. F. Lamb, D. M. Lee, and S. S. Markowitz
212
Neutron Activation Analysis of Thorium in Rocks and Ores by Multiple 7-Ray Peak Ratio Determination. Mariana Mantel, Propai Sung-Tung, and Saadia Amiel
Cation Exchange in Dimethyl Sulfoxide Media. Janauer, . E. Van Wart, and J. T. Carr a no
215
Rapid Spectrophotometric Determination of Uranium in Ores. T. M. Florence and Y. J. Farrar
271
220
Gas Chromatographic Determination of Sulfide, Sulfite, and Carbonate in Solidified Salts. J. R. Birk, C. M. Larsen, and R. G. Wilbourn
273
G. E.
Simultaneous Determination of Iron and Copper by a New Spectrophotometric Method. A. A. Schilt and P. J. Taylor
ANALYTICAL CHEMISTRY, VOL. 42, NO. 2, FEBRUARY 1970
·
3A
Contributed Articles Nonaqueous Titrimetric Determination of Active Esters of Amino Acids and Peptide Derivatives. Meir Wilchek, Mat/ Fridkin, and Avraham Patchornik
275
Correction. Theory of Curved Molar Ratio Plots and a New Linear Plotting Method. K. Momoki, J. Sekino, H. Sato, and N. Yamaguchi
Test of the Nernst Law in Concentration Cells of Complex Composition. Alan Blanchette and S. A. Carrano
277
Correspondence
Determination of Unsaturation in Sulfur-Containing Petroleum Fractions by Quantitative Hydrogenation. J. L. S. Curtis and M. 0. Baker
Surface Films on Glass Membrane Electrode. Brand and G. A. Rechnitz
278
On the Nature of the Enol
or
phenylthiocarbazone Chelates.
M. J. D.
304
Secondary Series of DiB. S. Freiser and Henry
305
Freiser
Artifacts of Dieldrin in Gas Chromatographic Analysis of Green Plant Material. D. E. G/otfe/ty and J. H. Caro
256
282
Aids for Analytical Chemists Electrochemical Generation of Silver(l) through Silver Sulfide Membranes. Application to Coulometric Titration of Chloride in Strong Oxidizing Media. K. S. Fletcher III and R. F. Mannion
Improved Glass Frit Interface for Combined Gas Chromatography—Mass Spectrometry. S. P. Markey 285
Multipurpose Gas Handling Apparatus. mayer Methyl Haloacetone Ketals as Steroidal Alcohol Derivatives in Gas-Liquid Chromatography and Combined GLC-Mass Spectrometry. G. A. Sarfaty and . M. Fates
Microanalytical Method for Determination of Perbromate Ion in the Presence of Macro Amounts of Other Bromine Anions. L. C. Brown and G. E. Boyd
288
Determination of Relative Rates by Differential Thermal Analysis. L. J. Taylor and S. W. Watson
Coulometric Titration of Amines in Chloroform Solution. Peter Wuelfing, Jr., E. A. Fitzgerald, Jr., and H. H. Richtol
Guide for Measures of Precision and Accuracy
312
291 Copyright 1970
by the American Chemical Society
294
297
MANUSCRIPT REQUIREMENTS published in December 1969 issue, page 2137, outlines scope and copy requirements to be observed in preparing manuscripts for consideration. Manuscript (4 copies) should be submitted to ANALYTICAL CHEMISTRY, 1155 Sixteenth St., N.W., Washington, D. C. 20036. The American Chemical Society assumes no responsibility for the statements and opinions advanced by contributors to its publications. Views expressed in the editorials are those of the editors and do not
necessarily represent the official position of the American Chemical Society.
299
Ultraviolet Spectrophotometric Determination of Nickel. M. W. Scoggins
301
Correction. A New Approach to the Solution of Electrochemical Problems Involving Diffusion. K. B. Oldham
252
Correction. Activity Measurements in Concentrated Sodium Chloride—Potassium Chloride Electrolytes Using Cation-Sensitive Glass Electrodes. Rima Huston and J. N. Butler 4A
·
310
312
1970 Subscription Rates 1
Correction. Activation Analysis for Molybdenum in Samples Containing Large Amounts of Tungsten. B. A. Thompson and P. D. LaFleur
A. 0. Nieder-
Spectroscopy Nomenclature
©
Microdetermination of Chromium in Biological Materials by Gas Chromatography. John Savory, Paul Mushak, F. W. Sunderman, Jr., R. H. Estes, and N. 0. Roszel
306
256
Members, domestic and foreign Nonmembers, domestic and Canada Nonmembers, foreign except Canada
yr.
$ 4.00 5.00 15.00
2 yr.
3 yr.
$ 7.00 9.00 27.50
$10.00 12.00 40.00
Postage: Canada and Pan-American Union, $2.50; foreign, $3.50. Single copies: current, $2.00 except Annual Reviews, $3.00 each. Rates for back issues and volumes are available from Special Issues Sales Dept., 1155 Sixteenth St., N.W., Washington, D. C. Claims for missing numbers will not be allowed if received more than 60 days from date of mailing plus time normally required for postal delivery of journal and claim. No claims allowed because of failure to notify the Subscription Service Department of a change of address or because copy is "missing from files."
Published monthly with Review issue added in April and a Laboratory Guide in July by the American Chemical Society, from 20th and Northampton Sts., Easton, Pa. 18042; Executive Offices, Editorial Headquarters, and Subscription Service Department, 1155 Sixteenth St., N.W., Washington, D. C. 20036; Advertising Office, 600 Summer St., Stamford, Conn. 06904. ANALYTICAL CHEMISTRY and other ACS periodicals are available on microfilm. For information write to: MICROFILM, Special Issues Sales, American Chemical Society, 1155 Sixteenth St, N.W., Washington, D. C. 20036. Second class postage paid at Easton, Pa. CHANGE OF ADDRESS: Notify Subscription Service Department, American Chemical Society, 1155 Sixteenth St., N.W., Washington, D. C. 20036. Such notification should include both old and new addresses, with ZIP code numbers, and be accompanied by mailing label from a recent issue.
Allow four weeks for change to become effective.
256
ANALYTICAL CHEMISTRY, VOL. 42, NO. 2, FEBRUARY 1970
