Evaluation of isotope migration: land burial. Water chemistry at commercially operated low-level radioactive waste disposal sites. Quarterly progress report, April-June 1981
Results are reported for radionuclide sorption experiments performed under anaerobic conditions and as a function of solution/solid ratio for trench shale and waters collected at the Maxey Flats disposal site in Kentucky. The observed degree of sorption (equilibrium K/sub d/) varied unpredictably as a function of solution to solid ratio. Measurements of pH and Eh were performed before and after the determinations to determine if redox conditions were altered significantly during the experiments. The experimental procedure appears capable of maintaining anaerobic conditions during most of the determinations. Changes in solution/solid ratio appear to affect the observed equilibrium sorption more than any variations in redox state during the determinations. However, our final evaluation of the proposed test procedure for measuring sorption of radionuclides from anoxic groundwater is that the test is not completely reliable. Since further improvements in the experimental procedure are not planned, this type of batch sorption test for anoxic waters will be terminated. Organo-radionuclide complex stability experiments in controlled environment chambers were completed. The results indicate that the temporal stability of chelated radionuclides in low redox geochemical environments are not easily predicted from comparisons of appropriate association constants and solubility products. Empirical information is required to reliably predict the behavior of chelated radionuclides under field conditions. Controlled oxidation experiments using disposal site trench waters were initiated. Preliminary results suggest that high contents of dissolved ferrous iron in trench waters can act as redox buffers to preserve low redox conditions during subsurface migration. Data on coprecipitation of radionuclides on ferric oxyhydroxide will be reported when analyses are completed.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5292556
- Report Number(s):
- NUREG/CR-2192-Vol.1-No.2; BNL-NUREG-51409-Vol.1-No.2; ON: DE82015017
- Country of Publication:
- United States
- Language:
- English
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