クロムアズロールSとトリス(1,10-フェナントロリン)鉄(II)陽イオンによるアルミニウムの間接吸光光度定量

概要

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Chromazurol S (CAS) anion is extracted into nitrobenzene as an ion-pair with tris(1, 10-phenanthroline) iron(II) cation at pH 5.5 and the extract has the absorption maximum at 600 nm. However, in the presence of aluminum, the absorbance of the extract decreases in proportion to its amount. By using the principle., (0.02〜3)μg of alum{num was spectrophotometrically determined. Four hundred milligrams of iron(II), 1.0ml of CAS solution (0.025%) and 5 ml of 1, 10-phenanthroline solution (0.3%) were added lo the sample solution containing less than 3μg of aluminum, and the pH of the resultant solution was adjusted to 5.5. After diluting it to 50 ml with water, 10.0 ml of nitrobenzene_ was added and CAS was extracted by shaking for 5 minutes. Less than 0.3mg of iron(II), (III), nickel, cobalt, copper, manganese and cadmium did not interfere with the determination of aluminum but more than 2μg of gallium, and 5μg of chromium(III), titanium and beryllium interfered.
社団法人日本分析化学会の論文
1977-09-05