By E. E. Kotlyar, T. N. Nazarchuk (auth.), G. V. Samsonov (eds.)
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Additional info for Chemical Properties and Analysis of Refractory Compounds / Khimicheskie Svoistva I Metody Analiza Tugoplavkikh Soedinenii / Химические Свойства И Методы Анализа Тугоплавких Соединений
The arsenic thus separating is distilled into the "cold" part of the ampoule. The resultant boron-arsenic compounds are characterized by great chemical stability. Verification of the solubility of B6As in several acids (Table 2) showed that none of the acids or acid mixtures taken dissolved the hexaboride completely. On prolonged boiling, boron arsenide is almost completely soluble in nitrose; however, the presence of an insoluble residue and the long period of boiling (8-10 h) make this method undesirable for analytical purposes.
Conc. HaPO, (1:1) HF conc. 5 - A similar kind of dissolution occurs in a mixture of sulfuric and nitric acids. We may suppose that in this case Ti0 2 or Ti(S04h is formed, and this then dissolves with the formation of titanyl sulfate TiOS04, which exists in acid solutions. In order to elucidate the composition of the white deposit we attempted to separate it from the main solution, but this proved impossible. Mter separation of the deposit on the Schott filter and washing with hot distilled water, the residue completely dissolved in the latter.
This method was used by Samsonov and Titkov , who took a 80-100-fold excess. Tests showed that on reducing the exceE'S of flux by a factor of two, complete decompOSition of the sample, with dissolution in hot water, was also achieved. 4 g/cma) in 100 ml of solution. The preCipitation and coagulation occupied no more than 20-25 min. 1 by means of NH3 (1:1) the bismuth was titrated with Complexone III, using xylenol orange as indicator. The precipitation of the phosphate ion with bismuth nitrate may be carried out after the potentiometric determination of boron by titration with alkali and mannitol.