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  • 1 Bhabha Atomic Research Centre Fuel Chemistry Division 400 085 Bombay (India)
  • | 2 BARC Prefre Expansion Project 401 502 Tarapur (India)
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A differential spectrophotometric method has been developed for uranium in presence of plutonium by making absorbance measurements at 420 nm in 4M H2SO4 using 5 cm cells. The absorbance measurements are made with two independent sets of standards: (1) having uranium only and (2) having uranium and plutonium in a fixed ratio R, against a uranium solution of high absorbance (1A) in the reference beam. A least-squares fit of data on absorbance and uranium concentration in the two cases gave two slopes m1 and m2, which were used to determine the concentration of uranium using the relationship CU=C0+m1·[AT-(1/m2–1/m1) R·CPu] where AT is the relative absorbance of uranium and plutonium at 420 nm and C0 is the intercept corresponding to slope m1 for pure uranium standards and m2 is the slope for mixed uranium and plutonium standards. A knowledge of CPu, the plutonium concentration, is essential and is obtained by differential spectrophotometric measurements at 835 nm by oxidizing plutonium to its hexavalent state. In the same aliquot, plutonium could be determined with a precision of better than ±0.5% and uranium with a precision of better than ±1.0%.

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Journal of Radionalytical and Nuclear Chemistry
Language English
Size A4
Year of
per Year
per Year
Founder Akadémiai Kiadó
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Chief Executive Officer, Akadémiai Kiadó
ISSN 0236-5731 (Print)
ISSN 1588-2780 (Online)