analytical - ACS Publications - American Chemical Society

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INDUSTRIAL AND ENGINEERING

ANALYTICAL WALTER J . M U R P H Y , EDITOR Editorial Assistant:

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G. GLADYS GORDON

ISSUED JANUARY 25, 1944 Manuscript

Assistant:

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V O L . 16, NO. 1

STELLA ANDERSON

Make-up

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CONSECUTIVE NO. 2

Assistant:

CHARLOTTE C. SAYRE

Advisory Board B . L. CLARKE T . R. CUNNINGHAM

G. E . F . LUNDELL M . G. M E L L O N

R. H . M Ü L L E R Η . Η . WILLARD

E m u l s i o n P o l y m e r i z a t i o n of S y n t h e t i c Rubber i n 10Gram Systems Charles F. Fryling

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Color of A q u e o u s P o t a s s i u m D i c h r o m a t e S o l u t i o n s . R. E. Kitson with M. G. Mellon

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D e t e r m i n a t i o n of Tetraethyllead i n Gasoline . . . . Harry Gonick a n d J. J. Milano

4

Gravimetric D e t e r m i n a t i o n of T u n g s t e n John H. Yoe and A. Letcher Jones

45

Specific Gravity of B u t a d i e n e M. R. Dean and T. W. Legatski

7

D i c h r o m a t e D e t e r m i n a t i o n of Iron, U s i n g Silver Reductor J. L. Henry and R. W. Gelbach 49

Physical M e t h o d s of Analysis of S y n t h e t i c a n d Natural Rubber R. Bowling Barnes, Van Zandt Williams, A. R. Davis, and Paul Giesecke

9

Precise M e a s u r e m e n t Analysis

of V o l u m e i n Titrimetric William M. Thornton, Jr. 50

Ethylbis-2,4-Dinitrophenylacetate, N e w pH Indica­ tor E. A. Fehnel a n d E. D. Amstutz

D e t e r m i n a t i o n of Rate of Cure for Natural a n d S y n ­ t h e t i c Rubber Leonard H. Cohan a n d Martin Steinberg

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D e t e r m i n a t i o n of A l p h a . P a r a - D i m e t h y l s t y r e n e i n Presence of Para-Methylstyrene, Styrene, a n d P a r a - C y m e n e . . John H. Elliott and Evelyn V. Cook

P y c n o m e t e r for Volatile Liquids. Control of Diffusion as Aid i n Precision P y c n o m e t r y . . . . M. R. Lipkin, J. A. Davison, W. T. Harvey, and S. S. Kurtz, Jr. 55

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Apparatus for Measuring G a s Permeability of F i l m Materials of Low P e r m e a b i l i t y . A. Cornwell Shuman

D e t e r m i n a t i o n of S o l u b l e P e c t i n a n d Pectic Acid b y Electrodeposition Kenneth T. Williams and Clarence M. Johnson 23 Analysis of P e t r o l e u m Oil-Soluble S o d i u m Sulfo­ n a t e s b y Adsorption John M. Koch

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Quantitative D e t e r m i n a t i o n of