Table I.
benzidine decasulfonic acid or its sodium salt.
Indicator Errors
0.1.V Cerate Warning Indicator Added Solution Titration Error, 70 bl1./300 ml, for Oxidation, MI. Warning Xame titrated solution indicator Ferroin Total Sodium di henvlamine d'fonite
0 3, 0.01Jf
0 06
0 08
0.2
0.03
0.23
REFERENCES
(1) Heumann, W. R., Belovic. B., A N ~ L . CHE3I. 29, 1226 (1957) (2) Kolthoff, I. > f , , sarve;, L, A., J . - A ~ ~ . Chem. SOC.52, 4179 (1930). (3) Sarver, L. A . , Fischer, W. von, IND. ETG.CHE\f., A N A L . ED. 7, '271 (1935).
WALTERR. HEEMANN C L A U D E ALLARD
Sodium diphenvlbenzidine decasulfonate
1.0,0.001~l4 0.02
0.02
0 05
0.03
0.08
Department of Chemistry Eniversitv of lfontreal Montreal; Canada
No. 177. Uranium Mononitride CHARLES
P.
KEMPTER, JOSEPH C. McGUIRE, and M. R. NADLER
Los Alamos Scientific Laboratory, University of California, Los Alamos, N. M.
T
crystal structure of uranium nitride has been investigated by Rundle, Baenziger, Wil.son, and hIcDonald (1) and found to be face-centered cubic with a lattice constant of 4 880 =k 0.001 A . They concluded that the structure was sodium chloride type, since the 420 reflection was of much greater intensity than the 331 reflection. The calculated density was 14.32 grams per cc. They did not tabulate the uranium nitride powder pattern. The authors gave no analysis of their HE
YJY." The ASTM x-ray diffraction file lists only one uranium nitride (card 3-1133). The formula is not stated. but a cubic lattice constant of 5.319 A. is given. This material is undoubtedly US2, be-
Table l.
Spectrographic Analysis of UN
hlajor
120 p.p.m.
