Sample preparation for semivolatile organics analysis of Hanford single-shell tank waste with high nitrate/nitrite and water content

Regulatory DQO Test Plan for Determining Method Detection Limits, Estimated Quantitation Limits, and Quality Assurance Criteria for Specified Analytes

“…Before performing the single extraction process for the semivolatile compounds, aliquots of the supernatants and the solids (mixed with DI water) are titrated with phosphoric acid. The resulting titration curves are used to establish the quantity of phosphoric acid required to adjust the extracting pH to the level defined by the procedure (approximately 6.5) (Stromatt et al 1993).…”

“…It is not entirely clear as how to interpret the presence of N-nitrosocompounds in the samples; it is conceivable they could be present in the native tank material. However, studies performed, which established the pH adjustment (Stromatt et al 1993) on Hanford single-shell tank matrices, did not observe the formation of nitration products.…”

An Approach for the Analysis of Regulatory Analytes in High Level Radioactive Waste Stored at Hanford, Richland, Washington

“…Consultation (Stromatt et al 1993) with two laboratories that have experience in analyses of tank wastes indicates that the factor applied based on typical tank waste is likely to be 10 to 100 times the soil/sediment EQL in the methods. This is in the range of a factor of 75 in method 8270C.…”