オキシヒドロキノンによるガリウム,インジウムおよびタリウムの検出

概要

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Many methods of detection of gallium, indium and thallium which belong to the IIIA group are interfered by the presence of elements of other groups. Hydroxyhydroquinone reacts with gallium, indium and thallium to produce a sensitive coloration, and color was not developed by other cations. Zirconium, hafnium, thorium and uranium develope a similar color, which is much weaker than that produced by gallium, indium or thallium, and the limit of detection of zirconium etc. is about 20100 times that of gallium etc. Filter paper is impregnated with a 1% alcoholic solution of hydroxyhydroquinone. A drop of the test solution is placed on the dried paper. The color and the limits of detection are as follows: Gallium, blue, 0.2 μg: indium, red, 0.2 μg: thallium, brown, 0.1μg: zirconium, red-violet, 4.5μg: hafnium red-violet, 9 μg; thorium, blue-violet, 11 μg: uranium, yellow-brown, 12 μg. Gallium, indium and thallium can be detected and differentiated from the others by the difference of their coloration.