Infrared Quantitative Analysis Data. CS-17. Determination of 2

Infrared Quantitative Analysis Data. CS-17. Determination of 2-Bromopentane and 3-Bromopentane Mixtures. F. A. Scheske, and W. H. Washburn. Anal. Chem...
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Determination of Butyl Ester of Stearic Acid in Polystyrene L. R. KILEY, The Daw Chemical Co., Midland,

Determination of Acetylsalicylic Acid, Phenacetin, and Caffeine in Mixtures

CS-14

Mich. Slit

Component

W. H. WASHBURN and E. 0. KRUEGER, AbboH Laboratories, North Chicago, 111.

Conc.

! 1

Component

'

1.

I

Stearic acid: C22H4402 butyl ester 1

I 1 0-10

AO.05

5.7 l a d i . sh.1

1

0 . 1 6 0 50 0.057 3 . 5

No./

1

1.

Instrument: Perkin-Elmer Model 12, NaCl prism Sample Phase: Solution in carbon tetrachloride Cell Windows: NaCl Absorbance Measurement: Calculation:

Base-Line-X

Inverted MatrixGra p hica I L L

Relative AbsorbanceQ-Analyticof

%

mm

~

~-

:

10.26 1 0.520 21.06 10.103 0 . 5 5 Instrumenf: Perkin-Elmer Model 12C, NaCl Prism Sample Phase: Solution in CHCI,

5.7

Cell Windows: NaCl Absorbance Measuremenf:

15.000

'"The relative absorbance i s given as the slope of the Beer's law concentration curve used expressed in terms o f absorbance per 100% o f constituent. ~

Calculofion:

CS-15

HUDSON, Ethyl Corp., Baton Rouge, La.

Base-Line-

Inverted MafrixGraphical-

Relative Absorbances-Analytical ComponentfX

1. 2. 3.

~~

Determination of Diethylaluminum Hydride and Diethylaluminum Ethoxide in Triethyl Aluminum

Point-X Successive A p p r o x . - Y

Matrix:

9.27

9.00

10.26

0.300 0.055 0.013

0.099 0.152 0.005

0.050 0.026 0.030

Moterial Purity: Reference compounds 9 9 +% pure Comments: Theoretical concentration of mixture i s 21.06 mg./ml. Theoretical concentration of each component is: acetylsalicylic acid, 1 1-34 mg./ml.; phenacetin, 8.1 mg./ml.; caffeine, 1.63 mg./ml. For details, see: Washburn, W . H., and Krueger, E. O., J. Am. Pharm. Asroc. Sc;. Ed. 38, 623 ( 1 949).

Determination of 2-Bromopentane and 3-Bromopentane Mixtures

-I

1

tion

4 . 8 5 0.042

0.093

F. A. SCHESKE and W. H. WASHBURN, Abbott Laboratories, North Chicago, 111.

CS- 17

1

Component

No.) 1.

~

1

2.

1. 2.

Cancn. mdml length

or y B.1. Pis.

9 . 2 7 0.557 21.06 0.117 0 . 5 5

AcetylCgH~04 salicylic acid j

Point-

Material Purity: Reference compounds 9 9 +yo pure Comments: Samples o f pure polystyrene, free o f the butyl ester o f stearic acid, are run to determine 1. Standards o f polystyrene plus the butyl ester o f stearic acid are run with each set o f samples to establish the analytical curve.

aluminum ethoxide

X

9 . 0 0 0.443 21.06 0.096 0 . 5 5

Matrix:

1.

L.

Formula

ACcuracy

Successive Approx.-

ComponentlX

R.

1

Name

CS-16

2 * 220 0.000

0.000 0.408

Nome

1

Formula

2-Bromopentane

'

CsHliBr

1

Slit

i'

(mm)

I 60-100

Ah or AV

10.2

zt1

Adjacent shoulders

I

------I

3-BrOmOpentane

CsHllBr

0-40

f l

,

12.3 12.112.8

Concn. % v/v Length mm

0.235 0.049

10

0.267 0.048

10 0.3

0.3

Maferiol Purity: AIEt2H was 9 6 % pure and a correction was applied. Comments: Triethylaluminum cells are loaded in a dry box. After run, the triethylaluminum sample i s blown from the cell with nitrogen and the cell is washed with an alcohol-hydrochloric acid mixture. The alcoholic HCl solution used i s 1 0 % 1 2 N HCI in alcohol. This solution is saturated with NaCl prior to use. The 4 . 8 5 ~base line point refers to the absorbance a t this wave length plus a constant used as reference absorbance. AlEtnOEt AIEt?H

Io = A 4 . 8 5 ~ Io = A4.85~

+ 0.083 + 0.129

These data represent standard publication and submission is opeu to an one in accordance with regulations of ANALYTICAL CHEMISTRY.The Cob?&& Society is acting only as an aid to the Journal. To standardize procedures ANALYTICAL CHEUI~TR requests Y that material be sent in quintuplicate to t i e chairman of the review committee. Robert C. Wilkerson, Celanese Corp. of America, Post Office Box 8, Clarkwbod, Tex.

1. 2. Material Purity: Comments:

0.340 0.000

0.000 0.864

Reference compounds 98% pure [no correction applied).

VOL. 29, NO. 12, DECEMBER 1 9 5 7

1895