Contributed Articles
Infrared Spectrophotometry for Carbon in Silicon as Calibrated by Charged Particle Activation. Y o s h i y u k i Endo, Y o s h i f u m i Y a t s u r u g i , N o b u y u k i A k i y a m a , a n d T a d a s h i Nozaki
2258
Stability Constants of Some Polyamine and Polyaminocarboxylate Complexes in Methanol-Water Mixtures by Differential pH*-Potential Titrimetry. D. B. Rorabacher, B. J . Blencoe, a n d D. W. Parker
2339
Spectrophotometric Determination of Cobalt with 2,4,6Tris(2'-Pyridyl)-s-Triazine. M. J . J a n m o h a m e d a n d G. H. Ay res
2263
Titration of Subnanomole Quantities of Fluoride Ions in Polar Nonaqueous Solvents. Edgar H e c k e l a n d P. F. Marsh
2347
Fluorometric Method for Determining Nanogram Quantities of Nitrite Ion. L. J . D o m b r o w s k i a n d E. L. Pratt
2268
Distribution Coefficient and Anion Exchange Behavior of Elements in Oxalic Acid-Hydrochloric Acid Mixtures. F. W. E. Strelow, C. H. S. W. Weinert, a n d Cynthia Eloff
2352
Mass S p e c t r o m e t r y Determination of Hydrogen Ther mally Evolved f r o m Tungsten-Nickel-Iron Alloys. G. L. Powell
2357
Design and Operation of Temperature-Controlled Multiple Element Electrodeless Discharge Lamps for Atomic Fluorescence Spectrometry. B. M. Patel, R. F. Browner, a n d J . D. W i n e f o r d n e r 2272 Dual Channel Synchronous Integration Measurement System for Atomic Fluorescence Spectrometry. Emil Cordos a n d H. V. M a l m s t a d t Signal Enhancement in Real-Time for High-Resolution Mass Spectra. F. W. McLafferty, J . A. Michnowicz, Rengachari V e n k a t a r a g h a v a n , Peter Rogerson, a n d B. G. Giessner Simultaneous Measurement of Plasma Concentrations of Lidocaine and Its Desethylated Metabolite by Mass Fragmentography. J . M. Strong a n d A. J . A t k i n s o n , Jr.
Electron Probe Microdetermination of Carbon in Ferrous Alloys. J . S. D u e r r a n d R. E. Ogilvie 2361 2277
2282
2287
High Accuracy Determination of Calcium in Blood Serum by Isotope Dilution Mass Spectrometry. L. J . Moore a n d L. A. M a c h l a n 2291 Gas Chromatographic Determination of Homovanillic Acid in H u m a n Cerebrospinal Fluid by Electron Capture Detection and by Mass Fragmentography with a Deuterated Internal Standard. Birgitta Sjôquist a n d Erik
Ànggârd
2297
Total-Effluent Gas Chromatography-Mass Spectrometry. William H e n d e r s o n a n d Gordon Steel
2302
Gas Chromatography of Volatile Mixed-Ligand Complexes of the Lanthanides. R. F. Sieck a n d C. V. B a n k s
2307
Peak Boundary Selection in Photopeak Integration by the Method of Covell. Kaj H e y d o r n a n d Witold Lada 2313 Systematic Approach to the Study of Aromatic Hydrocarbons in Heavy Distillates and Residues by Elution Adsorption Chromatography. D. .M. Jewell, R. G. R u b e r t o , a n d Β. Ε. Davis 2318 Detection and Variable T i m e Kinetic Determination of Micro and Submicrogram Amounts of Nitrilotriacetic Acid. H. A. Mottola a n d G. L. H e a t h Analysis of Mixtures of Aminopolycarboxylic Acids by Chemical Kinetics. Parts per Billion of Nitrilotriacetic in Water. L. C. C o o m b s , J o h n Vasiliades, a n d D. W. Marge r u m
2322
2325
Computerized Pattern Classification of Strongly Over lapped Peaks in Stationary Electrode Polarography. L. B. S y b r a n d t a n d S. P. Perone 2331
Resolution by Gas-Liquid Chromatography of Diastereomers of Five Nonprotein Amino Acids Known to Occur in the Murchison Meteorite. G. E. Pollock
2368
Notes Potentiometric Titration of Sulfate Using an Ion-Selective Iron Electrode. R a y m o n d Jasinski a n d Isaac T r a c h t e n 2373 berg Determination of Dissociation Constants of Acids and Bases by Potentiostatic Titration. J . J . Kankare
2376
Direct Determination of Sulfur in Oils by Atomic Absorp tion Spectrometry Using an Inert Gas Shielded Nitrous Oxide-Acetylene Flame. G. F. K i r k b r i g h t , Maurice M a r s h a l l , a n d T. S. West
2379
Computer Oriented System for Nondestructive Neutron Activation Analysis. M. de Bruin a n d P. J . M. Korthoven
2382
Multicomponent Pattern Recognition and Differentiation Method. Analysis for Oil in Natural Waters. Ihor Lysyj a n d P. R. Newton
2385
Influence of Solvent upon the Phosphorescence Charac teristics of Several Sulfonamides at 77 °K. D. R. Ven ning, J . J . M o u s a , R. J . Lukasiewicz, a n d J . D. Winefordner
2387
Application of the Theory of Graphs to the Optimilization of Chromatographic Separation Schemes for Multicom ponent Samples. D. L. Massart, Conny J a n s s e n s , Leonard K a u f m a n , a n d Robert S m i t s 2390 Gas Chromatographic Analysis of Aqueous Phosphate by Reaction Gas Chromatography. P. M. Wiese a n d R. H. Hanson
2393
Continuous Flow Measurement of Desorption Isotherms. S. Karp, S. Lowell, a n d A. Mustacciuolo
2395
Loss of Gold during Sample Dissolution. a n d R. A. W e s s m a n
2398
H. A. Moore
Selective Retention by Porous Polymer Adsorbents. Application to Formaldehyde Determination. L. S. Frankel, P. R. M a d s e n , R. R. Siebert, a n d K. L. Wallisch
ANALYTICAL CHEMISTRY, VOL. 4 4 , NO. 1 4 , DECEMBER 1 9 7 2 ·
2401 3A
Contributed Articles
reasons for buying t h e Oxford® variableratio d i l u t o r . . . 1. flame photometry dilutions 2. hemoglobin dilutions 3. glucose dilutions 4. cholesterolm dilutions ^ and you can probably name many more everyday procedures that require different dilution ratios. One Oxford* SEMI-AUTOMATIC DILUTOR will handle virtually all of them. Set any sample size from 10 to 100 ml, then adjust the diluent volume from 0.5 to 20 ml. Precision is ± 1 % . With either single or continuous aspirations, the sample and d i l u e n t are t h o r o u g h l y mixed. Corrosion and contamination are eliminated; liquids never touch metal. The pump and valve systems are polypropylene and glass. For a no-obligation demonstration or more information, contact
OXFORD
LABORATORIES
1149 Chess Dr., Foster City, CA. 94404 Telephone (Area Code 415) 573-1343
Rapid Spectrophotometry Determination of Arsenic in Iron and Steel. O. P. Bhargava, J . F. Donovan, a n d W. G. Hines
Aids for Analytical Chemists Modified Attapulgite—A New Support Material for Gas Chromatography. Rijhwani Moolchandra and K. L. Mallik
2404
Programmable Power Supply for Operation of Hollow Cathode Lamps in an Intermittent Current-Regulated High Intensity Mode. Emil Cordos and H. V. M a l m s t a d t
2407
Sealed, Inert, Gas Circulating Pump. W. V. S o u t h e r l a n d , and G. B. Rouse, Jr.
2411
W. A. McAllister,
Improved Ebullator for Solution Concentrator. Beroza, M . C . B o w m a n , and B. A. Bierl
Morton 2411
Advantages of Dual Electrode Mounts in Spark Source Mass Spectrometry Using Electrical Detection. C. W. Magee, D. L. D o n o h u e , a n d W. W. Harrison
2413
Economical Fluidized Dryer for Gas Chromatography Packing Material. P. C. Goodley a n d Marshall Gordon
2415
Thin-Film Sorbents for Obtaining Acridine Dye Spectra. J. J. Sjoblom
2416
A Simple Disposable Teflon-Capped Reaction Vial. L. Wolen
2418
R.
Spectrometry Nomenclature
2419
Guide for Use of T e r m s in Reporting Data in Analytical Chemistry
2420
Manuscript Requirements
2421
Author Index
2425
Subject Index
2435
© Copyright 1972 by the American Chemical Society
MANUSCRIPT REQUIREMENTS published in December 1972 issue, page 2421, 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. 1972 Subscription Rates 2 yr. 3yr. lyr. Members, domestic and foreign $ 5.00 $ 9.00 $12.00 Nonmembers, domestic and Canada 7.00 12.00 16.00 Nonmembers, foreign except Canada 15.00 27.50 40.00 Postage: Canada and Pan-American Union, $4.00; foreign, $5.00. 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 c"opy is "missing from files." Those interested in joining the American Chemical Society should write to Admissions Department at the Washington Office. Published monthly with Review issue added in April and a Laboratory Guide in August 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, 142 East Ave., Norwalk, Conn. 06851. 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 Washington, D. C. and at additional mailing offices. 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.
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ANALYTICAL CHEMISTRY, VOL. 44, NO. 14, DECEMBER 1972
