Measurements of Flammable Gas Generation from Saltstone Containing Actual Tank 48H Waste (Interim Report)

Cozzi, A. D.; Crowley, David A.; Duffey, J. M.; Eibling, R.E.; Jones, Timothy M.; Marinik, Andrew; Marra, James C.; Zamecnik, J.R.

doi:10.2172/881450

Cited by 3 publications

(6 citation statements)

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“…The model offered in the work that provided the saltstone samples for this study 1 linked the decomposition of TPB to both the curing temperature and the initial quantities of TPB in the saltstone. The TCLP performed on the simulant samples cured under the most extreme conditions (3000 mg/L TPB in salt and cured at 95 °C for at least 144 days) resulted in benzene values that were greater than half the regulatory limit.…”

Section: Discussionmentioning

confidence: 99%

“…In order to assess the effect of extended curing times at elevated temperatures on saltstone containing Tank 48H waste, saltstone samples prepared as a part of a separate study 1 were analyzed for benzene using a modification of the United States Environmental Protection Agency (USEPA) method 1311 Toxicity Characteristic Leaching Procedure (TCLP). To carry out TCLP for volatile organic analytes (VOA), such as benzene, in the Savannah River National Laboratory (SRNL) shielded cells (SC), a modified TCLP Zero-Headspace Extractor (ZHE) was developed.…”

Section: Executive Summarymentioning

confidence: 99%

“…12 SRNL evaluated both nonradioactive (prepared with simulated Tank 48H waste) and radioactive (prepared with actual Tank 48H waste) saltstone samples that were fabricated for an ongoing benzene generation study. 1 The benzene concentrations in the leachate from tests following the EPA TCLP Method 1311 protocol was the focus of this task. The release of toxic metals was not evaluated as a part of this task.…”

Section: Executive Summarymentioning

confidence: 99%

“…1 The configuration of the samples allowed only for the loss of benzene through one end of the cylindrical sample as the bottom and the wall are encased in glass, as shown in Figure 2-3. The single exit path for benzene introduced a potential concentration gradient in the samples.…”

Section: Sample Preparationmentioning

confidence: 99%

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Toxicity Characteristic Leaching Procedure Applied to Radioactive Saltstone Containing Tetraphenylborate: Development of a Modified Zero-Headspace Extractor

Crapse¹,

Cozzi²,

Crawford³

et al. 2006

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EXECUTIVE SUMMARYIn order to assess the effect of extended curing times at elevated temperatures on saltstone containing Tank 48H waste, saltstone samples prepared as a part of a separate study 1 were analyzed for benzene using a modification of the United States Environmental Protection Agency (USEPA) method 1311 Toxicity Characteristic Leaching Procedure (TCLP). To carry out TCLP for volatile organic analytes (VOA), such as benzene, in the Savannah River National Laboratory (SRNL) shielded cells (SC), a modified TCLP Zero-Headspace Extractor (ZHE) was developed. The modified method was demonstrated to be acceptable in a side by side comparison with an EPA recommended ZHE using nonradioactive saltstone containing tetraphenylborate (TPB). TCLP results for all saltstone samples tested containing TPB (both simulant and actual Tank 48H waste) were below the regulatory limit for benzene (0.5 mg/L). In general, higher curing temperatures corresponded to higher concentrations of benzene in TCLP extract. The TCLP performed on the simulant samples cured under the most extreme conditions (3000 mg/L TPB in salt and cured at 95 °C for at least 144 days) resulted in benzene values that were greater than half the regulatory limit. Taking into account that benzene in TCLP extract was measured on the same order of magnitude as the regulatory limit, that these experimental conditions may not be representative of actual curing profiles found in the saltstone vault and that there is significant uncertainty associated with the precision of the method, it is recommended that to increase confidence in TCLP results for benzene, the maximum curing temperature of saltstone be less than 95 °C. At this time, no further benzene TCLP testing is warranted. Additional verification would be recommended, however, should future processing strategies result in significant changes to salt waste composition in saltstone as factors beyond the scope of this limited study may influence the decomposition of TPB in saltstone.

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Section: Discussionmentioning

confidence: 99%

Section: Executive Summarymentioning

confidence: 99%

Section: Executive Summarymentioning

confidence: 99%

Section: Sample Preparationmentioning

confidence: 99%

See 2 more Smart Citations

Toxicity Characteristic Leaching Procedure Applied to Radioactive Saltstone Containing Tetraphenylborate: Development of a Modified Zero-Headspace Extractor

Crapse¹,

Cozzi²,

Crawford³

et al. 2006

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show abstract

“…9 The benzene method 10 captures the offgas from a saltstone sample using a charcoal tube (SKC Anasorb ® CSC Catalog# 226-01) while the sample cures. The charcoal tube with the captured offgas is then stripped of the Isopar ® L with carbon disulfide (CS 2 ) and analyzed by gas chromatography coupled with mass spectrometric detection (GC-MS).…”

Section: Methodsmentioning

confidence: 99%