1.1 本实施规程描述了一种单程流动（SPFT）试验方法，该方法可用于测量均质硅酸盐玻璃（包括核废料玻璃）的溶解速率，在温度低于100°C的各种试验溶液中。可在溶解物质对溶解速率影响最小化的条件下进行试验，以测量特定温度和pH值下的正向溶解速率，或测量溶解速率对各种溶质物质浓度的依赖性。 1.2 通过在包含试样的反应池中以连续或脉冲流模式泵送溶液进行测试。 必须在几种溶液流速下进行测试，以评估流速对玻璃溶解速率的影响。 1.3 本规程不包括静态试验方法，其中通过手动从反应池中移除溶液并用新鲜溶液替换来模拟流量。 1.4 可使用软化水、化学溶液（如pH缓冲溶液、模拟地下水溶液和盐水）或实际地下水进行测试。 1.5 可使用已知尺寸分数的碎玻璃或具有已知几何表面积的单片试样进行试验。 可检查反应固体，以提供有关试验中材料行为和反应机理的额外信息。 1.6 可使用含有放射性核素的玻璃进行试验。然而，该试验方法并未解决放射性样品的安全问题。 1.7 这些测试的数据可用于确定计算长期处理系统中玻璃腐蚀行为所需的动力学模型参数值（例如，见实践） C1174 ). 1.8 必须根据数据验收的所有质量保证要求执行此操作。 1.9 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.10 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.11 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本规程对SPFT试验装置的设计进行了规定性描述，并确定了SPFT试验的性能和试验结果的解释方面，这些方面必须由实验者解决，以提供对测量溶解速率的信心。 5.2 本规程中描述的SPFT试验方法可用于表征玻璃腐蚀行为的各个方面，这些方面可用于计算核废料玻璃长期行为的机械模型中。 5.3 根据使用的测试参数值，SPFT测试结果可用于测量玻璃的固有溶解速率、速率的温度和pH依赖性，以及各种溶解物质对溶解速率的影响。 5.4 可使用表面分析技术（如扫描电子显微镜）检查从试验中回收的反应样品，以进一步表征腐蚀行为。如果试样表面形成了特定的浸出层和第二相，则此类检查可以提供有关玻璃是否以化学计量方式溶解的证据。这些情况可能会影响使用该方法测量的玻璃溶解速率的准确性。本规程不涉及固体反应材料的分析。

1.1 This practice describes a single-pass flow-through (SPFT) test method that can be used to measure the dissolution rate of a homogeneous silicate glass, including nuclear waste glasses, 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. Tests must be conducted at several solution flow rates to evaluate the effect of the flow rate on the glass dissolution rate. 1.3 This practice 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 glass 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 material in the test and the reaction mechanism. 1.6 Tests may be conducted with glasses 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 glass corrosion behavior in a disposal system over long periods (for example, see Practice C1174 ). 1.8 This practice 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. ====== Significance And Use ====== 5.1 This practice 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 practice can be used to characterize various aspects of glass corrosion behavior that can be utilized in a mechanistic model for 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 glass, 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 glass 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 glass dissolution rate that is measured using this method. This practice does not address the analysis of solid reaction materials.