Significance and Use
5.1 This test method provides a prescriptive description of the design of a SPFT test apparatus and identifies aspects of the performance of SPFT tests and interpretation of test results that must be addressed by the experimenter to provide confidence in the measured dissolution rate.
5.2 The SPFT test method described in this test method can be used to characterize various aspects of waste form corrosion behavior that can be utilized in a mechanistic model, for example, calculating long-term behavior of a nuclear waste glass.
5.3 Depending on the values of test parameters that are used, the results of SPFT tests can be used to measure the intrinsic dissolution rate of a waste form, the temperature and pH dependencies of the rate, and the effects of various dissolved species on the dissolution rate.
5.4 The reacted sample recovered from a test may be examined with surface analytical techniques, such as scanning electron microscopy, to further characterize the corrosion behavior. Such examinations may provide evidence regarding whether the waste form is dissolving stoichiometrically, if particular leached layers and secondary phases were formed on the specimen surface, and so forth. These occurrences may impact the accuracy of the waste form dissolution rate that is measured using this method. This test method does not address the analysis of solid reaction materials.
Scope
1.1 This test method describes a single-pass flow-through (SPFT) test method that can be used to measure the dissolution rate of nuclear waste forms (simulated or actual), including, but not limited to, homogenous or heterogeneous glass or glass ceramics, in various test solutions at temperatures less than 100 °C. Tests may be conducted under conditions in which the effects from dissolved species on the dissolution rate are minimized to measure the forward dissolution rate at specific values of temperature and pH, or to measure the dependence of the dissolution rate on the concentrations of various solute species.
1.2 Tests are conducted by pumping solutions in either a continuous or pulsed flow mode through a reaction cell that contains the test specimen. It is recommended that tests are conducted at several solution flow rates to evaluate the effect of the flow rate on the waste form dissolution rate.
1.3 This test method excludes static test methods in which flow is simulated by manually removing solution from the reaction cell and replacing it with fresh solution.
1.4 Tests may be conducted with demineralized water, chemical solutions (such as pH buffer solutions, simulated groundwater solutions, and brines), or actual groundwater.
1.5 Tests may be conducted with crushed waste form of a known size fraction or monolithic specimens having known geometric surface area. The reacted solids may be examined to provide additional information regarding the behavior of the waste form in the test and the reaction mechanism.
1.6 Tests may be conducted with waste forms containing radionuclides. However, this test method does not address safety issues for radioactive samples.
1.7 Data from these tests can be used to determine the values of kinetic model parameters needed to calculate the waste form corrosion behavior in a disposal system over long periods (for example, see Practice C1174).
1.8 This test method must be performed in accordance with all quality assurance requirements for acceptance of the data.
1.9 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.10 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.11 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
