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

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Abstract

The batch distribution coefficients (Kd, mL solution /g dry resin) for pertechnetate (TcO4) between ReillexTMHPQ anion exchange resin and various caustic solutions have been determined. The average Kd value in 1.5 M NaNO3/l.0 M NaOH solution is (262.2 ± 12.6) mL7sol;g for TcO4 − ranging from 1.0 × 10TM M to 5.0 × 10−4 M. Pertechnetate Kd values were measured in a series of NaOH7sol;NaNO3 solutions. The series are: 1.00 M NaOH with 0.010 to 5.00 M NaNO3; 0.100 M NaOH with 0,010 to 5.00 M NaNO3; 0.100 MNaNO3 with 0.10 to 5.00M NaOH; 1.00MNaNO3 with 0.10 to 5.00 M NaOH; 1.50 M NaNO3 with 0.10 to 5.00 M NaOH; 3.50 M NaNO3 With 0.10 to 5.00 M NaOH. The Kd values are described by the following equation. This equation was used to predict the Kd values for a series of tank waste simulants. The predicted Kd values are different from the measured values with an average absolute difference of (29 ± 10)%. Pertechnetate kdvalues for 101-SY, 103-SY, DSS, DSSF-2.33, DSSF-5, DSSF7, 101-AW, and Melton Valley simulants have been determined as a function of time. A first order approach to equilibrium is observed. The Kd values at two hours are (1066±45), (870± 102), (346± 18), (296± 15), (245 ±6), (209± II), (218±5), and (167 ± 5) mL/g, respectively.

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