ベリリウムの分析化学的研究(第17報)

概要

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In the analysis of Be in a solution containing each ion of Cu, Fe (III), Zn, Ni, Mn and Ti, the solution is made slightly acid with a mixture of HAc and NH4Ac, metals other than Be are separated by precipitating them as oxinates, the filtrate is converted into Be(OH)2 by a usual method, then it is ignited and weighed as BeO. An aggregate close to the composition of beryl with 11.54 % BeO as a sample is fused in a mixture of KOH, Na2CO3 and KNO3, the product is treated with 80 % H2SO4, the precipitate of H2SeO3 removed, the solution neutralized with NaOH, acetate buffer solution added, H2S passed in to remove the precipitate of FeS and NiS, then treated with NH4NO2 to obtain hydroxides of Al and Be and to separate from Ca and Mg, the solution treated with ether-HCl mixture to remove AlCl3·6H2O, the Al and Fe remaining in the filtrate are precipitated as oxinates, the filtrate treated with NH4OH to precipitate Be(OH)2 and this is determined as BeO by usual method. Since the BeO thus obtained contains SiO2, as an impurity, it is heated with H2SO4 and HF to remove the SiO2 and to obtain the residue of a pure BeO.