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Title: Comparison of leach results from field and laboratory prepared samples

Abstract

The leach behavior of saltstone prepared in the laboratory agrees well with that from samples mixed in the field using the Littleford mixer. Leach rates of nitrates and cesium from the current reference formulation saltstone were compared. The laboratory samples were prepared using simulated salt solution; those in the field used Tank 50 decontaminated supernate. For both nitrate and cesium, the field and laboratory samples showed nearly identical leach rates for the first 30 to 50 days. For the remaining period of the test, the field samples showed higher leach rates with the maximum difference being less than a factor of three. Ruthenium and antimony were present in the Tank 50 supernate in known amounts. Antimony-125 was observed in the leachate and a fractional leach rate was calculated to be at least a factor of ten less than that of /sup 137/Cs. No /sup 106/Ru was observed in the leachate, and the release rate was not calculated. However, based on the detection limits for the analysis, the ruthenium leach rate must also be at least a factor of ten less than cesium. These data are the first measurements of the leach rates of Ru and Sb from saltstone. The nitratemore » leach rates for these samples were 5 x 10/sup -5/ grams of nitrate per square cm per day after 100 days for the laboratory samples and after 200 days for the field samples. These values are consistent with the previously measured leach rates for reference formulation saltstone. The relative standard deviation in the leach rate is about 15% for the field samples, which all were produced from one batch of saltstone, and about 35% for the laboratory samples, which came from different batches. These are the first recorded estimates of the error in leach rates for saltstone.« less

Authors:
;
Publication Date:
Research Org.:
Savannah River Lab., Aiken, SC (USA)
OSTI Identifier:
5348680
Report Number(s):
DPST-85-261
ON: DE86015712
DOE Contract Number:  
AC09-76SR00001
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 36 MATERIALS SCIENCE; 54 ENVIRONMENTAL SCIENCES; ANTIMONY; LEACHING; CESIUM; NITRATES; RUTHENIUM; WASTE FORMS; LOW-LEVEL RADIOACTIVE WASTES; PORTLAND CEMENT; ALKALI METALS; BUILDING MATERIALS; CEMENTS; DISSOLUTION; ELEMENTS; MATERIALS; METALS; NITROGEN COMPOUNDS; OXYGEN COMPOUNDS; PLATINUM METALS; RADIOACTIVE MATERIALS; RADIOACTIVE WASTES; SEPARATION PROCESSES; TRANSITION ELEMENTS; WASTES; 052002* - Nuclear Fuels- Waste Disposal & Storage; 360604 - Materials- Corrosion, Erosion, & Degradation; 520200 - Environment, Aquatic- Chemicals Monitoring & Transport- (-1989)

Citation Formats

Oblath, S B, and Langton, C A. Comparison of leach results from field and laboratory prepared samples. United States: N. p., 1985. Web.
Oblath, S B, & Langton, C A. Comparison of leach results from field and laboratory prepared samples. United States.
Oblath, S B, and Langton, C A. 1985. "Comparison of leach results from field and laboratory prepared samples". United States.
@article{osti_5348680,
title = {Comparison of leach results from field and laboratory prepared samples},
author = {Oblath, S B and Langton, C A},
abstractNote = {The leach behavior of saltstone prepared in the laboratory agrees well with that from samples mixed in the field using the Littleford mixer. Leach rates of nitrates and cesium from the current reference formulation saltstone were compared. The laboratory samples were prepared using simulated salt solution; those in the field used Tank 50 decontaminated supernate. For both nitrate and cesium, the field and laboratory samples showed nearly identical leach rates for the first 30 to 50 days. For the remaining period of the test, the field samples showed higher leach rates with the maximum difference being less than a factor of three. Ruthenium and antimony were present in the Tank 50 supernate in known amounts. Antimony-125 was observed in the leachate and a fractional leach rate was calculated to be at least a factor of ten less than that of /sup 137/Cs. No /sup 106/Ru was observed in the leachate, and the release rate was not calculated. However, based on the detection limits for the analysis, the ruthenium leach rate must also be at least a factor of ten less than cesium. These data are the first measurements of the leach rates of Ru and Sb from saltstone. The nitrate leach rates for these samples were 5 x 10/sup -5/ grams of nitrate per square cm per day after 100 days for the laboratory samples and after 200 days for the field samples. These values are consistent with the previously measured leach rates for reference formulation saltstone. The relative standard deviation in the leach rate is about 15% for the field samples, which all were produced from one batch of saltstone, and about 35% for the laboratory samples, which came from different batches. These are the first recorded estimates of the error in leach rates for saltstone.},
doi = {},
url = {https://www.osti.gov/biblio/5348680}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Mar 25 00:00:00 EST 1985},
month = {Mon Mar 25 00:00:00 EST 1985}
}

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