Use o f O r g a n i c A d d i t i v e s t o I n d u c e t h e S e l e c t i v e L i q u i d Liquid E x t r a c t i o n o f N i o b i u m w i t h T h e n o y l t r i f l u o r o a c e tone
FUTURE ARTICLES Listed below are papers to appear lytical Chemistry
in forthcoming
issues of Ana
Aart Jurrlaanse and F. L. Moore C o m p l e x a t i o n o f Scandium(lll) w i t h
I m m e d i a t e D e t e r m i n a t i o n o f Traces o f L e a d i n A i r b y Atomic Absorption Spectrometry
8-Quinolinol
J . N. Petronio and W . E. Ohnesorge Spectrophotometric Determination of Unsaturated r o l i d i n e Alkaloids
Georges Thilliez Principles o f S t a t i o n a r y P h a s e S e l e c t i v i t y i n G a s - L i q u i d Chromatography
Pyr
A . R. Mattocks A n i o n E x c h a n g e a n d a S e l e c t i v i t y Scale f o r Elements i n Sulfuric Acid M e d i a w i t h a S t r o n g l y Basic Resin
S. H. Langer Determination o f Ephedrine a n d Certain Related pounds b y Ultraviolet Spectrophotometry
Com
Jack E. Wallace G a s C h r o m a t o g r a p h i c A n a l y s i s o f D i l u t e A q u e o u s Sys tems
F. W . E. Strelow and C. J . C. Bothma Fast A n a l y s i s o f P h e n o l , M e t h y l p h e n o l s , a n d P o l y m e t h y l p h e n o l s b y G a s C h r o m a t o g r a p h y Using P a c k e d C a p i l l a r y Columns Catherine Landault and Georges Guiochon
W . Θ . Jennings and H . E. Nursten D e t e c t i o n Limits o f Elements i n t h e S p e c t r a o f P r e m i x e d , O x y - A c e t y l e n e Flames V. A . Fassel and D. W . Golightly
Simultaneous a n d I n d e p e n d e n t Potentiostatic Control o f T w o I n d i c a t o r Electrodes: A p p l i c a t i o n t o t h e C o p p e r ( l l ) / C o p p e r ( l ) / C o p p e r S y s t e m i n 0 . 5 M KCI a t t h e R o t a t i n g R i n g - D i s k Electrode D. T. Napp, D. C. Johnson, and Stanley Biuckenstein
Spectrophotometric Determination of Manganese(VII) b y Reduction w i t h 6 - M e t h o x y - 2 - M e t h y l t h i o - 4 - P y r i m i d i n e C a r b o x y l i c Acid
Counter Double Current Distribution: N u m b e r of Stages
O. K. Chung and C. E. Meloan
R. O . Butterfield, Constance K. Tjarks, and H. J . Dutton
ELASTOMER STEREOSPECIFIC
POLYMERIZATION
Effects o f V a r y i n g
Elastomer Stereospecific Polymerization ADVANCES IN CHEMISTRY SERIES NO. 52 A symposium sponsored jointly by the Division of Rubber Chemistry and the Division of Polymer Chemistry of the American Chemical Society. Reviews organometallic polymerization. Surveys a variety of polymerization systems and products, such as • Titanium and vanadium halides as cocatalysts with alkyialuminum compounds.
ilÉÉiÉk
• l l i ws& '"WIFIHIr
• Mechanisms of polymerization with lithium alkyls.
ADVANCES IN CHEMISTRY SERIES
52
• Electron donors in diene polymerization. • Polymerizing 1,3-pentadiene to cis-l,4-stereoisomers. • Polymerizing higher aldehydes.
Order
• Kinetics of polymerization.
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