5-オキシクロモンによるベリリウムの吸光光度定量 : オキシクロモン系化合物の分析用試薬としての検討(第3報)

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Beryllium reacts with 5-hydroxychromone above the pH ca. 5 to give a yellow water-insoluble complex which can be extracted by a variety of organic solvents. When the complex is extracted with benzene from an aqueous solution at a pH of 7.08.0, the absorbance is measured at λmax 398 mμ. Factors affecting the spectrophotometric determination, e.g., organic solvents, pH, concentration of reagent, volume of aqueous phase, time of shaking, stability and foreign ions, were discussed. Analytical procedure is as follows. To a sample solution containing up to 9μg of beryllium, are added 2ml of 0.3% methanol solution of the reagent and 5 ml of buffer solution (sodium boratehydrochloric acid, 0.075M in sodium borate) to maintain the pH of 7.07.5, and it is made up to 25ml with water. To this is added 10ml of benzene, and after the vigorously shaking for about one minute, the extract is dried over anhydrous sodium sulfate, and the absorbance it mesured at 398mμ. An analytical curve is rectilinear. Al3-, Pd2+, Fe3+, Cu2+ and Ti4+ give a positive error, however In3+, Tl3+, PO3-4 and F- a negative one.
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