CONTRIBUTED ARTICLES Some Applications of the Nitrous Oxide—Acetylene Flame in Chemical Analysis b y Atomic Absorption Spectrometry. J. A. Bowman and J. B. Willis
Photometric Titrations with Dichromatic Light. Ringbom, Bengt Skrifvars, and Ebbe Still
Modular, Coulometer.
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1221
Use of M e t a l Ion Catalysis in Detection a n d Determination of Microamounts of Complexing Agents. Determination of E t h y l e n e d i a m i n e - N N N ' N ' - T e t r a acetic Acid. H. A. Mottola and Henry Freiser
1 294
Microdetermination o f W a t e r in H y d r o c a r b o n Solvents Using Ultraviolet Spectrophotometry, b y Reaction with N-Benzylideneaniline. I. R. Bellobono
1298
Estimation of Potassium in Mixtures with Lithium a n d Sodium b y Nonaqueous Titration. I. L. Shresta and M. N. Das
1 300
Concentration G r a d i e n t s in Film a n d Spherical M e r c u r y Electrodes under V a r i a b l e - F l u x Plating Conditions. S . L. Phillips and L. F. Karr . . . .
1301
Direct Determination of Fluoride in Tungsten Using Fluoride Ion Activity Electrode. B. A. Raby and W. E. Sunderland
1 304
Scale Expansion a n d Increase in Sensitivity in Rotational Viscosimetry. Eberhard Zimmermann. . . .
1305
C h e l a t e Formation of T e t r a v a l e n t V a n a d i u m with Pyrocatechol Violet. S. P. Mushran, Om Prakash, and J. N. Awasthi
1 307
Analysis of Bituminous C o a l b y a Combined M e t h o d of Ozonolysis, G a s C h r o m a t o g r a p h y , a n d Mass Spectrometry. M. C. Bitz and Bartholomew Nagy . .
1310
Simple A p p r o x i m a t i o n for Pressure Correction Factor in G a s C h r o m a t o g r a p h y , istvan Haiasz and Erwin Heine
1313
1 273
G a s C h r o m a t o g r a p h i c Determination of Forma l d e h y d e b y Sucrose O c t a A c e t a t e - C o l u m p a k T . R. S. Mann and K. W. Hahn
1314
1 270
S e p a r a t i o n a n d Determination of Trinitrotoluene Isomers b y G a s C h r o m a t o g r a p h y . D. G. Gehring andJ.E. Shirk
1315
1282
Quantitative Gas Chromatographic Ethanolamines as Trifluoroacetyl L. E. Brydia and H. E. Persinger
1318
1230
Coulostatic Titrations Using a Dropping M e r c u r y Electrode. R. W. Sorensen and R. F. Sympson
1238
F a r a d a i c I m p e d a n c e Technique David Elliott and G. S. Buchanan
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Twin
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Notes
Transistorized Controlled-Potential J. E. Harrar and Ervin Behrin
with
Infrared
1210
Anders
Supporting Electrolyte Effects in Nonaqueous Electrochemistry. Coordinative Relaxation Reactions of Reduced M e t a l Acetylacetonates in AcetOnitrile. R. W. Murray and L. K. Hiller, Jr
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Computer Search System for Retrieval of Data. D. H. Anderson and G. L. Covert
Cells.
M i c r o d e t e r m i n a t i o n of O x y g e n in O r g a n i c C o m pounds Using Nondispersive I n f r a r e d Absorptiometry. J. A. Kuck, A. J. Andreatch, and J. P. Mohns ,
M e a s u r e m e n t of O r g a n i c C a r b o n in W a t e r Using the H y d r o g e n - F l a m e Ionization Detector. R. A. Dobbs, R. H. Wise, and R. B. Dean
1 249
1255
Determination of S u b - P P M Nickel a n d V a n a d i u m in Petroleum b y Ion Exchange Concentration a n d X R a y Fluorescence. J. G. Bergmann, C. H. Ehrhardf, L. Granatelli, and J. L. Janik
1 258
Exchange Equilibrium through Anion Exchange Membranes. W. J. Blaedel and E. L. Christensen. . . .
1262
A N e w M e t h o d for M e a s u r i n g the O x i d a t i o n S t a bility of Elastomers. W. F. Fischer and W. H. King, Jr. .
Direct Determination of Amine Salt-Base Ratios b y Nuclear Magnetic Resonance Spectrometry; Correlation of Acid Strengths in Chloroform b y N u clear M a g n e t i c Resonance a n d I n f r a r e d Spectrometry. S. A. Koch and T. D. Doyle
Fine Structure of Isotopically L a b e l e d Amino Acids Determined b y Ion Exchange C h r o m a t o g r a p h y . P. D. Klein and P. A. Szczepanik
A p p l i c a t i o n of Ion-Pair Extraction to Partition Chromatographic Separation of Pharmaceutical Amines. T. D. Doyle and Joseph Levine
1 265
Analysis of Derivatives.
VOL. 39, NO. 11, SEPTEMBER 1967
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Extra-Large constant Temperature Refrigerated Bath/Circulator -20°tO+60°C±0.1°! New combination bath and circulator with powerful motor driven pump for circulating to spectrometers, viscometers, refractometers, colorimeters, polarimeters! • LARGEST HI-LO B A T H available in i t s t e m p e r a t u r e range • ADJUSTABLE SOLID STATE TRANSISTORIZED ACCUMAT" temperature control • DOUBLE WALL STAINLESS STEEL c o n s t r u c t i o n with almost 7 gallon capacity
CONTRIBUTED ARTICLES D e t e r m i n a t i o n o f N i t r o g e n in Transition M e t a l N i t r i d e s b y T u b e Furnace O x i d a t i o n a n d G a s Chromatographic Measurement. R. A. Meyer, E. P. Parry, and J. H. Davis
1321
Retention T i m e - B o i l i n g Point C o r r e l a t i o n s d u r i n g P r o g r a m m e d T e m p e r a t u r e C a p i l l a r y Column Analysis o f C 8 - C i 2 Aromatic Compounds. D. E. Willis
1 324
Thin L a y e r C h r o m a t o g r a p h i c S e p a r a t i o n and S p e c t r o p h o t o m e t r i c D e t e r m i n a t i o n o f Benzo [a ]P y r e n e in O r g a n i c Extracts o f A i r b o r n e P a r t i c ulates. T.W. Stanley, M.J. Morgan, and J. E.Meeker. .
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Separation of Zirconium(IV) and Thorium(IV) f r o m Each O t h e r a n d f r o m N u m e r o u s M e t a l Ions b y Aqueous Paper Chromatography. Mohsin Qureshi and Fahmida Khan
1329
D e t e r m i n a t i o n o f T r a c e M e t a l s in T e r e p h t h a l i c A c i d b y Ion E x c h a n g e C o n c e n t r a t i o n a n d XR a y Fluorescence. J. G. Bergmann, C. H. Ehrhardl, L. Granatelli, and J. !.. Janik
1331
Radiochemical Separation of C o p p e r b y g a m E x c h a n g e . R. R. Ruch and J. R. DeVoe
Amal . . . .
1333
T r a c e Element D e t e r m i n a t i o n b y E l e c t r o c h r o m a t o graphic Radiometric Precipitation. R. S. Morse, G. A. Welford, and E. L. Chiolis
1336
• SEALED MECHANICAL REFRIGERATION, r e m o t e b u l b t h e r m o m e t e r , b a t h cover
WITH NEW MagFlO MAGNETIC STIRRER CIRCULATION! vertical and horizontal liquid movement • NEW MAGFLO" gives s m o o t h , g e n t l e a g i t a t i o n and temperature uniformity within ± 0 . 1 ° C • NEW MAGFLO» e l i m i n a t e s electric c i r c u l a t o r bulkiness a n d v i b r a t i o n Send f o r c o m p l e t e l i t e r a t u r e o n all MagFlo® Water Baths
Correspondence Reactions o f L a b i l e T r i m e t h y l s i l y l D e r i v a t i v e s w i t h F l u o r o c a r b o n s in a G a s C h r o m a t o g r a p h — M a s s Spectrometer System. R. L. Foltz, M. B. Neher, and E. R. Hinnenkamp
1338
A i d s for A n a l y t i c a l Chemists Modification of a Gas C h r o m a t o g r a p h for Subambient Temperature Control. William Dammeyer
1339
D e t e r m i n a t i o n o f M e t h y l Ethyl L e a d A l k y l s a n d H a l i d e S c a v e n g e r s in G a s o l i n e b y G a s C h r o m a t o g r a p h y a n d Flame I o n i z a t i o n D e t e c t i o n . N. L. Soulages
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A S e a l e d Thin W i n d o w X - R a y T u b e f o r Light a n d H e a v y Element E x c i t a t i o n . T. D. Kirkendall and P. F. Varadi
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