Use of electrical conductivity to estimate effects of competing ions on radionuclide distribution coefficients

✍ Scribed by H. Yasuda

• Book ID: 104783538
• Publisher: Springer Netherlands
• Year: 1994
• Tongue: English
• Weight: 354 KB
• Volume: 75
• Category: Article
• ISSN: 0049-6979
• DOI: 10.1007/bf00482950

✦ Synopsis

The distribution coefficient (Kd) between the soil solid phase and the liquid phase is a commonly used parameter to evaluate radionuclide behavior in soil. For reliable evaluation, the variability of the Kd due to changes of environmental conditions should be clarified. In the present study, applicability of electrical conductivity (EC) to estimate effects of competing ions on Kd was examined in batch experiments. The Kd of five radionuclides (6~ 54Mn, 8~Sr, r37Cs, 65Zn) were found to be in inverse proportion to the supernatant EC. The Ka of 6~ and 54Mn were increasing at 7 days and no stable Kd could be determined. For 85Sr, 137Cs, and 65Zn, the regression equations obtained between the Ka of the equilibrium state and the supernatant EC were validated in another experiment; it is expected that their Kas can be determined accurately using the EC. Because of its simplicity in measurements, using EC should be very practical for estimating effects of competing ions on Kd of selected radionuclides.