X-RAYDIFFRACTION DATA
leads to c:b = (a/b)(c,‘a) = 0.2085 (morph.) against 0.2344 (x-rays). The discrepancy in the density determinations is ascribed to inaccuracy in the obserx ed density, due to the small size of the available crystal (1.7 mg.). A pori-der pattern (Table I) was taken in a Philips camera with the sample mounted in a thin-walled capillary tube.
elle Donnay, Geophysical Laboratory, and to J. D. H. Donnay, The Johns Hopkins University, for guidance in both theory and practice of crystallography.
Space Group. P21/n. Cell Dimensions. a = 14.23 A., b = 20.31 A,, c = 4.76 A. (all 10.3%). Formula Weights per Cell. 4. Formula Weight. 540.21. Density. 1.21 f 0.08 grams per cc. (Berman balance); 1.305 1 0.013 grams per cc. (x-ray).
LITERATURE CITED
(1) Crute, hf. B., dissertation on “Crystal Structure of Sickel Etioporphyrin 11,” The Johns Hopkins University, Baltimore, Md., 1958. (2) Smith, Esther, Corwin, A. H., “Use of the Goniometer in the Identification of Organic Compounds,” Abstracts of Papers, 97th Meeting, American Chemical Society, Baltimore, Md., April 1939, p. 52M.
ACKNOWLEDGMENT
CRYSTAL MORPHOLOGY Crystal system. Monoclinic. Form and habit. Keedles elongated parallel to c. Shovving rhombic prism { 1101, pinacoids { O l O ) and { 101). Twinning fairly common (see above). Axial Ratio. a:b:c = 0.7054:l: 0.2085 (based on morphology): 0.7006: 1:0.2344 (based on x-rays), Beta Angle. 90’0’.
This research was supported in part by a grant from the Petroleum Research Fund administered by the American Chemical Society. Grateful acknowledgment is hereby made to the donors of said fund. The copper etioporphyrin was supplied by A. H. Corwin. Sincere thanks are also due to Gabri-
%
Determination of trans Unsaturation (Expressed as Elaidic Acid) in Fatty Acids
CRYSTdLLOGRAPHIC data for publication in this section should be sent to IT. C. McCrone, 501 East 32nd St., Chicago 16, Ill.
Determination of Carbon Monoxide and Carbon Dioxide in Air CSM-65
R. 1. SCHEDDEL, The D o w Chemical Co., Midland, Mich.
J. E. CALLEN a n d 2. T. PACE,
CS-63
The Procter and Gamble Co., Cincinnati, O h i o
Slit
I No
1
Component Name Formula
_
_
Eloidic I Cl,Hi,O?
I
i _
1 Range
5
_
_
X B.I.
Accurccy
-
-
0-100 10.6
_ I
I Concn. Slit
~
(mm)
1
Points
_
AA ~ ~
-
10.36
I 10.13-
,
1
g/l length mm
_
_
0.250 1 20 0.051~ 0.5
No.
-
10.67
I
1
,
.
Carbon monoxide
~
co
~
%
I
_
mm
AA or Av
length cm
_______
_
700
0.209
0-40 I_____-l___
1
p~ 10.05 rl 4 . 2 6 ~ 0.186
Carbon dioxide
~
I
I
1
3.8- 0.033~ 5.2 ~
700
5
Instrument: Boird Associates M o d e l A, NaCl prism Sample Phase: Gas, 700 mm. Hg pressure Cell Windows: NaCl Absorbance Measurement:
Base line
Calculation:
Culculation: Graphical Relative Absorbance-Analytical Matrix:
Bose l i n e - X
Inverse matrixGraphicalX
Point-
Successive approx.-
Relative Absorbances~-Analytical M a trix: Component/h 4.62
10.36~ 0.460 I./g.cm.
4.26 0.745 0.000 0.000 7.820 Reference compounds 99 $% pure
1
2 Material Purity:
Reference compounds 99 $% pure
Material Purity:
Range
Concn.
(mm)
I
2
Instrument: Perkin-Elmer Model 12-C, NaCl prism Sample Phase: Solution in carbon disulfide Cell Windows: NaCl Absorbance Measurement:
-
-.
Component Nume Formula
a Relative absorbances are given as the slope of the Beer’s law conof centration curves used expressed in terms of absorbance per constituent.
Determination of trans Unsaturation (Expressed as Methyl Elaidate) in Methyl Esters J. E. CALLEN and 2 . T. PACE, The Procter a n d Gamble Co., Cincinnati, O h i o
No.
Component Name Formula
’
Range
Accuracy
CS-64
X
Slit
B.L.
(mm)
Concn. g/l Length
AX
mm
9
1
Instrument: Perkin-Elmer M o d e l 12-C, NaCl prism Sample Phase: Solution in carbon disulfide Cell Windows: NaCl Absorbance Measurement: Calculation:
Base line
Graphical
Relative Absorbance-Analytical Matrix:
~~
elaidate
,
0.250 20 0.051~ 0.5 10.59
These d a t a represent standard publication a n d submission is open t o anyone in accordance with regulations, of AXALYTICAL CHEMIBTRY.T h e Coblentz Society is acting only as an aid t o t h e journal.
2066
e
ANALYTICAL CHEMISTRY
Component/X
1
10.36~ 0.416 I./g.cm.
~
Material Purity:
Reference compounds 99 +%pure
T o standardize procedures. AN.ALYTICAL CHEMISTRY requests t h a t material be sent in quintuplicate t o t h e chairman of t h e r e n e w commlttee: Robert Wilkerson, Celanese Corp. of America, Post Office Box 8, Clarkwood, Tex.
c.
