1.1 本测试方法描述了固相萃取（SPE）程序，以分离 99 Tc来自环境水（非工艺相关或废水样品）。用液体闪烁光谱法测定锝-99β活性。 1.2 该测试方法旨在测量 99 Tc在大约0.037Bq/L（1.0pCi/L）或更大的范围内。 1.3 该测试方法已成功用于自来水。用户有责任确保本试验方法对大于1L的样品和未测试基质的水的有效性。 1.4 锝-99也可使用规程在水样中测定 D8026型 . 1.5 以国际单位制表示的值应视为标准值。括号中给出的值仅供参考，不视为标准值。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 有关具体危险说明，请参阅第节 9 . 1.7 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 尚未对所有可能的矩阵评估该测试方法。测试方法的适用性应根据相关特定水域确定。

1.1 This test method describes a solid phase extraction (SPE) procedure to separate 99 Tc from environmental water (non-process-related or effluent water samples). Technetium-99 beta activity is measured by liquid scintillation spectrometry. 1.2 This test method is designed to measure 99 Tc in the range of approximately 0.037 Bq/L (1.0 pCi/L) or greater for a one litre sample. 1.3 This test method has been used successfully with tap water. It is the user’s responsibility to ensure the validity of this test method for samples larger than 1 L and for waters of untested matrices. 1.4 Technetium-99 alternatively can be determined in water samples using Practice D8026 . 1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are provided for information only and are not considered standard. 1.6 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. For specific hazard statements, see Section 9 . 1.7 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 test method has not been evaluated for all possible matrices. Test method suitability should be determined on specific waters of interest.