Differential pulse voltammetric determination of U(VI)-Tc(VII) and U(VI)-Cr(VI) in alkaline solutions
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V.E. Sladkov
Differential pulse voltammetric (DPV) technique has been developed for the simultaneous determination of the elements in Tc(VII)-U(VI) and U(VI)-Cr(VI) mixtures in alkaline solutions. The method gave a precision of about 14% to 2% in the range of 1×10-7--1×10-4 for Cr(VI) and Tc(VII) and 1×10-6--1×10-4 for U(VI). The detection limits are 8×10-8 mol l-1 for Tc(VII) and 3×-7 mol l-1 for Cr(VI), and 8×10-7 for U(VI). It has been established that Tc(VII) could be determined in the presence of about 350 excess fold U(VI). The reduction of Tc(VII) with hydrazine has been suggested to eliminate the effect of Tc(VII) ions on the U(VI) determination. U(VI) has been determined in the presence of Cr(VI) up to molar concentration ratio U(VI)/Cr(VI)=1:1, while Cr(VI) could be determined in the presence of U(VI) in the solutions with up to molar concentration ratio Cr(VI)/U(VI)=1:15. The reliability of the determination of the elements of Tc(VII)-U(VI) and U(VI)-Cr(VI) mixtures in alkaline solution has been tested by a standard addition method.
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Artikel in diesem Heft
- Luminescence study on solvation of americium(III), curium(III) and several lanthanide(III) ions in nonaqueous and binary mixed solvents
- Isotope correlations for determining the isotopic composition of plutonium
- Chemical analysis of transuranium nuclides in the uranium solution of the JCO criticality accident
- Differential pulse voltammetric determination of U(VI)-Tc(VII) and U(VI)-Cr(VI) in alkaline solutions
- Radiocesium removal from high level liquid waste and immobilisation in sodium silicotitanate for geological disposal
- Hot test of partitioning strontium from high-level liquid waste (HLLW) by dicyclohexano-18crown-6 (DCH18C6)
- Study of Ru released under accidental conditions by overheated nuclear fuel: the emission of Ru and U
- Evaluation of resonance ionization mass spectrometry for the determination of 135Cs/137Cs isotope ratios in low-level samples
- Determination of mass transfer coefficients of 99Tc(VII) in forward and backward transport in PUREX-relevant systems by using analytical ultracentrifugation
- Evaluation of the natural and man-made radioactivity levels around the Egyptian nuclear facilities
