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K. E. Laintz, C. M. Wai, C. R. Yonker and R. D. Smith, “Extraction of Metal Ions from Liquid and Solid Materials by Supercritical Carbon Dioxide,” Analitical Chemistry, Vol. 64, No. 22, 1992, pp. 2875-2878. doi:10.1021/ac00046a039

has been cited by the following article:

• TITLE: Recovery of Uranium and Plutonium from Waste Matrices Using Supercritical Fluid Extraction

  AUTHORS: Krishnamurthy Sujatha, Kancharlapalli Chinaraga Pitchaiah, Nagarajan Sivaraman, Thandankorai Ganapathi Srinivasan, Polur Ranga Rao Vasudeva Rao

  KEYWORDS: Supercritical CO2; SFE; Uranium; Plutonium; φCMPO; Cellulose Matrix

  JOURNAL NAME: American Journal of Analytical Chemistry, Vol.3 No.12A, December 31, 2012

  ABSTRACT: Supercritical fluid extraction (SFE) of plutonium in its nitrate form from actual waste, i.e. plutonium bearing cellulose matrix was demonstrated using 0.1 litre capacity extraction vessel. Complete recovery of plutonium was demonstrated using modified supercritical carbon dioxide (Sc-CO2), i.e. Sc-CO2 containing octylphenyl-N, N-diisobutyl-carbamoyl- methylphosphine oxide (φCMPO). Near complete recovery of uranium was demonstrated from simulated waste matri- ces, i.e. uranium bearing teflon, glass and cellulose matrices using preparative scale SFE, i.e. from 1 litre capacity ex- traction vessel. The recovery of uranium was established using Sc-CO2 modified with acetyl acetone.