Radioactive strontium in mixed fission products could be rapidly separated by the two-step extraction deviced by the authors. The solution of the material was first adjusted to pH 7 and extracted with 0.05 M TTA-benzene. By this treatment rare earths and yttrium were made to go into the organic phase out of the solution. The remaining aqueous phase was transferred into another separatory funnel, adjusted to pH 8, and extracted with 0.05 M TTA-hexone. In this case the radioactive strontium was completely extracted into the organic phase. Only less than 5% of ruthenium present in the solution was extracted at the same time. Detailed data of the experiments on the extraction involving the determination of distribution coefficient, and the equilibrium constant were tabullated.
In order to separate rapidly the radioactive strontium and cesium from the solution containing gross fission products and other non-radioactive metallic ions, cupferron-chloroform extraction was attempted. By changing the acidity of the aqueous solution from 1N hydrochloric acid to pH 4, and by performing extractions in each stage, the strontium and the cesium could remain in the aqueous phase, while the other could be removed into the organic phase. The radioactive strontium may be extracted in the organic phase by the following extraction with TTA-hexone at pH 8.
The composition of the bast fibres of Ganpi plant (Wickstroemia sikokiana Franch. et Sav.) was investigated in the processes of the traditional paper-making of Japan. It was found that hemicelluloses of the bast fibres had significant bearings on the paper-making and the excellent character of Japanese paper. The hemicellulose isolated from holocellulose of the Ganpi bast fibres by alkaline extraction were found to be composed of 13.6∼15.8% of D-glucuronic acid (which is partly present as 4-O-methyl-D-glucuronic acid), 58.1∼80.9% of D-xylose, and small amounts of D-mannose, D-galactose, L-arabinose, and L-rhamnose. It was shown that the degree of polymerisation of the hemicellulose calculated as a pentosan is about 160, and the molecule has basically a linear structure in which the uronic groups are present along the polymer chain at a ratio of one carboxyl group for each six or eight pentose sugar units.
When allylbenzene was treated with the same moles of sodium amide and benzyl chloride in liquid ammonia, one or two benzyl radicals were introduced into allylbenzene to produce 3,4-diphenyl-1-butene and 3-benzyl-1-butene. The reaction is similar to the well-known reaction of benzyl cyanide and benzyl chloride in liquid ammonia and that of 2-phenyl-1-ethanol and benzyl chloride in benzene. Two forms of 2,3-diphenylpropionic acid were isolated and their I. R. spectra were measured. Different curves were obtained in KBr disks, while the identical curves were obtained carbon tetrachloride solution. Infrared absorption spectra were measured by Professor Kinumaki and his associates of this Institute and the elementary analyses were performed in the laboratory of Shionogi and Company, Ltd., to whom the writers are deeply indebted.
The structural change of kaolinite and Kibushi-clay with heat-treatment in the relatively low temperature region has been studied. It has been found that there are generally three processes, and that the structural change depends on the degree of crystallinity of the original samples.
The electronic structure and spectra of phenol was studied from the semi-empirical point of view, using the LCAO-ASP-CI-MO method. The excitation energies and oscillator strengths of transitions to lower excited states were calculated. The agreement between the calculated and the observed values is very good. The charge distribution, bond orders and the π-electronic dipole moment are also calculated.
(1) The cellulose nitrate containing 10.6% of nitrogen decomposes above about 160°C. There appear distinct breaking points on the decomposition curves at constant temperatures slightly above the decomposition point. The higher the constant temperature of reaction, the greater becomes the decomposition loss in weight. (2) The thermal decomposition after preheating at a temperature slightly below the decomposition point for an hour or so gives a greater loss of decomposition than that without preheating. (3) The cellulose nitrate kept previously under a reduced pressure of about 10−2mmHg yields a greater decomposition loss in weight than that without any treatment.
The electron diffraction photographs of tropone in the gaseous state were taken with an τ2-sector. The data of the scattered intensity was analyzed by means of the radial distribution method as well as by the correlation method. The investigation of the molecule has led to the conclusion that the molecule assumes an essentially co- planar structure having a regular heptagon ring. The most probable values for the bond distances are: C—C=1.405±0.005Å, C=O=1.26±0.02Å and C···H=1.09±0.03Å.
A simple and rapid separation method for cesium-137 in biological materials has been presented. It is composed of three steps, phosphate elimination, ammonium phosphomolybdate precipitation and chloroplatinate precipitation. The over-all yield of cesium is over 85% and the decontamination from other fission activities is more than 105 for cerium-144 and strontium-89. The contribution of the activities of rubidium-87 and potassium-40 is negligibly small in the determination of cesium-137 in biological materials by beta counting.
The molecular structure of 1,1,2,2-tetrafluoro-1,2-dichloroethane was investigated by means of the sector-microphotometer method of electron diffraction. The existence of two isomeric forms, i. e., trans and gauche, was confirmed, and the amount of the gauche form was found to be 48±5 per cent. at 10°C. This corresponds to the energy difference of 440±110 cal./mol., the trans form being more stable than the gauche form. The interatomic distances and the bond angles were determined as follows: & C–F=1.33_0±0.01_5Å ∠CCF=108°±1°30’ & C–C=1.54±0.04Å ∠CCCl=112°±1°30’ & C–Cl=1.74_5±0.01_5Å ∠FCCl=110°±1° \
oindentand the azimuthal angle of the gauche form=62.5°±3°.