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concluded that 0.01% is the optimum amount for nucleation from practical standpoint. ( 2 ) The influence of lithium content. The glass of the composition, MgO 15, Al203 23, SiO2 62-100+ XLi20, whereX-4, 6, 8, 12, by weight, was melted with and without addition of 0.01% platinum. The specimens of the same size as above were heated from room temperature to 1050-1100°C with the rate of 5°C/min., and then kept consstant for one hour. The bending strength of platinum containing glasses increased remarkably when their lithium content was high (12%), whereas only a negligibly small increase was found in the glasses of low lithium content below 6%. This indicates clearly that the function of platinum was influenced by the amount of lithium in glass. It was also confirmed that the glasses of low lithium content could be converted into a polycrystalline material of high mechanical strength even when no platinum was added. The investigation of this interesting phenomenon is now going on. ( 3 ) The optimum composition range in the sysem Li20-MgO-A1,02-Si02. Keeping Li20 at a constant value of 12% other components were changed as ; MgO x, Al203 y, SiO2 z, where x, y, z are mole ratio by weight and x+y-i-z —100, the range in which the two conditons, (a) glass may be obtained at a melting temperature lower than 1400°C, (b) the glass converts into the polycrystalline material without any noticeable deformation during the reheating will be satisfied. The range in which the condition (a) was satisfied was x : 0-30, y : 0-30, z : 60-100, and that of satisfying (b) was x : 0-20, y : 0-30 and z : 60-100. Studies on the Fluorometric Analysis. (XII) Fluorometric Determination of Aluminium by the Extraction of its Pontachrome Blue Black R Complex with Amylalcohol An Application to the Analysis of Pure Magnesium Masayoshi ISHIBASHI, TSUllellObU SHIGEMATSU, Yasuharu NISHIKAWA Nippon Kagaku Zasshi (Journal of the Chemical Society of Japan, Pure Chemisty Section), 81, 259 (1960) A fluoometric method for the micro-determination of aluminium based on the extraction of the Pontachrome Blue Black R complex with amyl alcohol was investigated. Pontachrome Blue Black R reacts with aluminium to form a stable complex compound which shows an intense red fluorescence by ultraviolet light, with illumination and so the reaction has been used for the fluorometric analysis of aluminium. As the complex is easily extracted with amyl alcohol from an aqueous solution with pH 4.8-5.4, the sensitivity of the method can be increased and the influence of the quenching substances can be avoided, by the application of the solvent extraction. The fluoresence of the complex in organic medium shows almost the same

nippon kagaku zasshi/nihon kagaku zasshi

Studies on the Fluorometric Analysis. XII. Fluorometric Determination of Aluminium by Extraction of its Pontachrome Blue Black R Complex with Amylalcohol. Application to the Analysis of Pure Magnesium