Feed Adjustment Chemistry for Hanford 101-SY and 103-SY Tank Waste: Attempts to Oxidize the Non-Pertechnetate Species

More than 50% of the technetium in Hanford 101-SY and 103-SY tank waste is not pertechnetate (TcO4−). These non-pertechnetate species (TcN) are stable, soluble, reduced complexes of technetium. In order to remediate these waste, it will be necessary to oxidize these species to TcO4−. For radioanalytical purposes, oxidation requires digestion in Ce(IV)/16M HNO3. Many oxidants are ineffective. Sodium peroxydisulfate, sodium peroxydisulfate/silver(I), and ozone oxidize all of the technetium species to pertechnetate.

[1]  R. King,et al.  Noble Metal Catalyzed Hydrogen Generation from Formic Acid in Nitrite-Containing Simulated Nuclear Waste Media , 1996 .

[2]  H. Taube,et al.  The Oxidation of Captive Oxalate , 1960 .

[3]  R. Schibli,et al.  Structural and (99)Tc NMR Investigations of Complexes with fac-[Tc(CO)(3)](+) Moieties and Macrocyclic Thioethers of Various Ring Sizes: Synthesis and X-ray Structure of the Complexes fac-[Tc(9-ane-S(3))(CO)(3)]Br, fac-[Tc(2)(tosylate)(2)(18-ane-S(6))(CO)(6)], and fac-[Tc(2)(20-ane-S(6)-OH)(CO)(6)][ , 1998, Inorganic chemistry.

[4]  G. Anderegg,et al.  Preparation, characterization, and crystal, molecular, and electronic structure of (H/sub 2/EDTA)/sup 99/Tc/sup IV/(. mu. -O)/sub 2//sup 99/Tc/sup IV/(H/sub 2/EDTA). 5H/sub 2/O. A 2. 33-A Tc-Tc distance which may represent a sigma/sup 2/. pi. /sup 2/delta*/sup 2/ bond , 1981 .

[5]  D. Morgan,et al.  Migration of Technetium-99 in the Alluvial Aquifer at the Nevada Test Site, Nevada , 1993 .

[6]  S. Radzinski,et al.  Technetium Oxidation State Adjustment for Hanford Waste Processing , 1998 .

[7]  D. L. Blanchard,et al.  Technetium in alkaline, high-salt, radioactive tank waste supernate: Preliminary characterization and removal , 1997 .

[8]  A. Bard,et al.  Standard Potentials in Aqueous Solution , 1985 .

[9]  G. Anderegg,et al.  Synthesis and X-ray structure of a new Tc(IV) oxalato complex: K4[(C2O4)2Tc(μ-O)2Tc(C2O4)2]·3H2O , 1990 .

[10]  S. A. Barker,et al.  Pretreatment Technology Plan , 1993 .

[11]  M. A. Gerber.  Review of technologies for the pretreatment of retrieved single-shell tank waste at Hanford , 1992 .

[12]  F. Albert Cotton,et al.  Advanced Inorganic Chemistry , 1999 .

[13]  A. Townshend.  Standard potentials in aqueous solutions , 1987 .

[14]  J. Spinks,et al.  Introduction to Radiation Chemistry , 1964 .

[15]  S. Radzinski,et al.  SORPTION BEHAVIOR OF PERTECHNETATE ION ON REILLEXTM-HPQ ANION EXCHANGE RESIN FROM HANFORD AND MELTON VALLEY TANK WASTE SIMULANTS AND SODIUM HYDROXIDE/SODIUM NITRATE SOLUTIONS , 1998 .