キシレノールオレンジによるインジウムの分光光度定量

概要

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A method is described for the spectrophotometric determination of indium with Xylenol Orange. The sample solution containing 580 μg of indium is transfered to a 25 ml volumetric flask. Ammonium bifluoride is added to mask small amounts of aluminum, thorium and zirconium. ο-Phenanthroline is then added to mask copper, cobalt and nickel. The pH is adjusted to 34. Ten ml of buffer solution (pH 3.33.6) and then Xylenol Orange are added. After diluting to the mark and allowing to stand for 10 minutes the absorbance is measured in a 10 mm cell at 530 mμ, using the reagent blank as the reference. Beer's law is obeyed and the molar absorbancy index is 1.9×104. According to the continuous variation method and mole ratio method, the composition of the complex corresponds to In-XO is 1 : 1, where XO is Xylenol Orange. Five mg of uranium (VI), 1 mg of cadmium and chromium (III) do not interfere.
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