Analysis of a Rubber Mixture
CS-119
V. A. CIRILLO, The Atlantic Reflning Co., Philadelphia, Pa, Component
%
Formula
Name
1
Range
Concn. Acc~cy
X or Y
Slit ( m m ) AX or Av
5.1. Pfs.
glml length mm
Neoprene
0-25
12.0
8.92
0.79 0.096~
Film
Butyl
0-25
f3.0
8.15
0.75 0.097~
Film
Natural
0-50
lt3.0
11.96
0.90 0.091~
Film
GR-S
0-50
f3.0
14.33
1.10
Film
0.110p
Insfrumenf: Beckmon IR-2, NoCl prism !iomple Phase: Solid rubber Cell Windows: NaCl plate (film, solvent pumped off) Absorbance Measurement: Base iine-X?Point-Calculation:
Inverse m a t r i x Graphical-
Successive approx.-
llelotive Absorbancesb-Analyfical Matrix: ComponentlX
8.92
1 2 3
1.00
0.00 0.00 0.00
4 Material Purify:
8.15 0.28 1.37 0.08 0.00
14.33 0.00 0.00
11.96 0.39 0.00 1.40 0.00
0.00 2.00
9 9 % pure
1 gram11 00 ml. and reflux for 12 hours
(Comments: Sample preparation: Solvent: Xylenes
Ail based on neoprene being selected as unity. Relative absorbances are given as the slope of the Beer's law concentration curves used expressed in terms of absorbance per 100% of constituent.
Determination of C&O Alkylbenzenes S. li, HASTINGS and D. E. NICHOLSON
cs-120
Humble O i l & Reflning Co., Baytown, lex. .-
Slit
1
'
I -I 3 1 -
Instrument: Perkin-Elmer Model 1 12, CsBr prism Sample Phose: Solution in carbon tetrachloride Cell Windows: CsBr Absorbance Measurement:
lndane
Calculation:
Base line-
Inverse m a t r i x Graphical-
P o i n t 2 Successive a p p r 0 x . X
I
o-Cymene
C1oHll 0-100 l t O . 5
1
2 9 . 5 1 ~ 1.089
~
: : : -
-1
4
Concn.
Component
-1
2
i
1,3-Diethyl-
n-Butyl-
CloHla 0-100
h0.5
2 2 . 2 1 ~ 0.484
___________-___ CloHid 0-100 3 ~ 0 . 5 1 9 . 1 0 ~ 0.314
1
Relative Absorbances-Anolyfical Matrix:
0. '00
Component/X
1 0.100
1 2 3 4
1
loo
These d a t a represent standard publication a n d submission i s open t o anyonc in accordance with regulations of ANALYTICAL CHEMISTRY.T h e Coblentz Society is acting only a s a n aid t o t h e journal.
Maferial Purity:
23.96~ 2.910 0.041 0.103 0.054
29.51~ 0.029 0.256 0.030 0.041
22.21~ 0.056 1.076 0.882 0.110
19. l o p 0.097 0.100 0.048 0.767
99.5%
To standardize procedure, AXALYTICAL CHEMISTRY requests t h a t materials be s e n t in quintuplicate t o t h e chairman of the review committee: D E Nicholson, Research and Development Division, Humble Oil & Refining Co , P. 0. Box 3950, Baytown, Tex.
VOL. 32, NO. 2, FEBRUARY 1960
299
