Determination of N-Ethyl-mToluidine in N-Ethyl-K(2,3dihydroxypropyl)-m-toluidine
Determination of Paraldehyde in Aqueous Solutions of Acetaldehyde
IC. B. WHETSEL, W. E. ROBERSON, and M. W. KRELL Tennessee Eastrnan Co., Divlslon of Eastrnan Kodak Co., Klngsport, Tenn.
HARVEY POBINER, Esso Research and Engineering Co.. Analytical Reseatsh Divislon, linden, N. J.
Component No.1
1
1
1 Formula
Name
1 1 rz I 2: I Accu-
N-Ethyl-m- CSHI~N toluidine1
Rage
I 1
CS- 147 Concn. mglml Length cm
Slit
hn)
1::4gl;I
1
I
1 . 4 9 2 ~ 0.36 1 . 2 ~
fO.l
&lo
50
Calculation:
Inverse m a t r i x Graphical&
Range Formula
Material Purity:
Comments: See ANAL CHEM. 29, 1006 (1957) for other details o f this type o f analysis. a Relative absorbances are given as the slope of the Beer's law concentration curves used expressed in terms of absorbance per loo'% o f constituent. The calibration line passes through -0.035 absorbance ot 0% N-ethyl-m-toluidine.
Determination of Hydroxybenzoic Acids in Potassium Bromide Disks
cs-149
-
Name
Formula
1
o-Hydroxybenzoic acid
&He03
2
I 1 I
in-Hydroxy- C7HsOa benzoic
acid
3 p-Hydroxybenzoic
acid
I 1 I
Range
Accuracy
%
%
AA or Av -. _ _ _
Concn. length
0-100
f 2
14.33 0.436
1 mg./0.4 g
-I
(mm)
0 . 0 8 0 ~ KBr in 12.7m m diam. disk
--
.~
0-100
14.83 0.592 1 mg./0.4 g 0 . 1 1 7 ~KBr in 12.7-
f 2
mm diam. disk C.iH60~ 0-1001 f 2
mm
9.06~ 66.4
99
+ 70
Relative absorbance is given as the slope of the Beer's law concentration curve used expressed in terms of absorbance per 100% o f constituent.
Instrument: Perkin-Elmer Model 21, NaCl prism Sample Phase: Dispersion in potassium bromide disk Cell Windows: None Absorbance Measurement:
Slit No.
Au
Comments: Two 25-1111. CClr extractions will quantitatively (98% mtn.) remove the paraldehyde, in the specifled range, from a 10-1111. sample. The CCln solvent, saturated with water in the extraction, does not etch the NaCl cell windows. The 9.04-p band is due to the cyclic ether structure"of paraldehyde.
Calculation: or v 0.1. Pts.
ml.
Length
Base I i n e l L Point __
1
Reference compounds 99%
X
mm
AX or
Instrument: Perkin Elmer Model 21, NaCl prism Sample Phase: Carbon tetrachloride extract o f aqueous sample
Component/X
1.492~ 1.98
D. E. NICHOLSON Humble Oil 8, Reflning Co., Baytown, lex.
Concn. 9/50
Slit
Calculation: Inverse matrix _ _ Successive approx. _ _ Graphical X Relative Absorbances"-Analytical Matrix:
Successive approx--
1
70
or X 0.1. Pts.
-I
Relative Absorbancesa-Analytical Matrix:
Material Purify:
7'
-l-.----I-----I-I-
Cell Windows: NaCl Absorbance Measurement:
Point-
Componentjh
X
Accuracy
10
Instrument: Cary Model 14, fused silica prism in series with a 600 linelmm. echelette grating Sample Phase: Solution in carbon tetrachloride Cell Windows: Corex Absorbance Measurements:. Base I i n e X
Component
CS- 148
Base line-
Inverse m a t r i x G r a p h i c a l
P o i n t X Successive appro-
Relative Absorbances-Analytical Matrix:
14.33~ 0.550 0.200 0.147
ComponentlX
1 2
3 Material Purify:
14.83~ 0.173 0.710 0.112
11.69~ 0.210 0.182 1.060
98%.
Comments: Infrared Intensities were derived from potassium bromide disks prepared using a 10-minute grinding time. This method allows the ready detection of components, if any, not provided for in the analytical matrix.
11.69 0.191 1 mg.10.4 g 0.038~KBr in 12.7mm diam. disk
The data represent standard publication and submission is
present series of infrared data. Future plans for continuance of
~ E E M E I T B Y . The Coblentz Society is acting only as an aid to the journal. With this issue ANALYTICAL CHEMISTRY is completing the
The chairman of the present review committeeisD. E. Nicholson, Research and Development Division, Humble Oil and Refining Go., P. 0. Box 3950, Baytown, Tex.
o en to anyone in accordance with regulations of ANALYTICAL the series mill be announced by the Coblentz Society.
VOL. 32, NO. 13, DECEMBER 1960
o
1899
