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Spectrophotometric Determination of Uranium with Ammonium Aurin Tricarboxylate
Author(s) -
Lai T. T.,
Chang T. L.
Publication year - 1960
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.196000002
Subject(s) - chemistry , molar absorptivity , absorbance , uranium , ammonium , nuclear chemistry , absorption (acoustics) , inorganic chemistry , analytical chemistry (journal) , chromatography , organic chemistry , physics , materials science , acoustics , optics , metallurgy
For the purpose of developing a sensitive and precise spectrophotometric method for uranium determination, the reaction of uranium (VI) with aluminon, ammonium salt of aurintricarboxylic acid, was rigorously examined. Uranium reacted with aluminon to give a pink color absorption complex with the maximum absorbance at 535 mμ and optimum pH of 4.0 to 4.8. The presence of two kinds of absorption complex, UO 2 ++ ‐ATA and (UO 2 ++ ) 2 ‐ATA, was proved, the electromigration tests for both were shown to be negative. The molar extinction coefficient of UO 2 ++ ‐ATA was found to be 7400 and that of (UO 2 ++ ) 2 ‐ATA, 12000, with the instability constants of 5.0×10 −7 and 2.8×10 −12 respectively. The practical sensitivity was 0.5 to 1 p.p.m. The color reaction was also found to conform with Beer's law, and the intensity did not change within four weeks.