Abstract
A new sensitive extractive spectrophotometric method has been suggested for the determination of uranium in soils, stream sediments and rock samples using 5-(2′-carboxyphenyl)azo-8-quinolinol (R). Uranyl nitrate is extracted in isobutylmethyl ketone (MIBK) at pH 5.2–6.1 in presence of saturated ammonium nitrate solution. The aqueous solution of R is shaken with MIBK containing uranyl nitrate. R forms almost instantaneously an amber coloured complex with the uranium in MIBK. The complex is stable for 24 hours. The molar absorptivity and Sandell's sensitivity of the complex are 1.035·104l·mol−1·cm−1 and 0.022 μg·cm−2, respectively, at λmax 524nm. Beer's law is obeyed over the range 1.4–7.1 μg·ml−1 of uranium. An amount as low as 1.4 μg·ml−1 of the uranium could be satisfactorily determined within a relative standard deviation of ±1.7%. The proposed method is sensitive, highly precise, simple in operation, rapid and reliable.
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