1.1 这些实践为在排放点从管道、泄水道、导管和传送带获取废物样本提供了指导。包括以下内容: 小节 实践A–液体或泥浆排放 实践B–固体或半固体放电 7. – 9 10 – 12 1.2 这些规程适用于没有其他适用ASTM取样方法的情况（见规程 D140/D140M 和 D75/D75M )针对特定行业。 1.3 这些实践不涉及流量和时间比例采样器和其他自动采样设备。 1.4 样品取自流动的废物流或移动的废物体，因此仅在一定时期内具有描述性。 样本描述的周期长度取决于采样频率和合成方案。 1.5 建议将这些实践与指南结合使用 D4687 . 1.6 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。 参见第节 5. 了解更多信息。 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《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====== 4.1 这些实践中概述的程序是从流动流中获取固体、半固体和液体废物描述性样本的指南，并包含参考文件中涵盖的许多相同程序和设备。这些做法本身并不一定会导致收集代表总废物量的样品。必须通过应用适当的统计方法和质量保证措施来估计样本描述废物质量的程度。建议将这些实践与指南结合使用 D4687 .

1.1 These practices provide guidance for obtaining samples of waste at discharge points from pipes, sluiceways, conduits, and conveyor belts. The following are included: Sections Practice A – Liquid or Slurry Discharges Practice B – Solid or Semisolid Discharges 7 – 9 10 – 12 1.2 These practices are intended for situations in which there are no other applicable ASTM sampling methods (see Practices D140/D140M and D75/D75M ) for the specific industry. 1.3 These practices do not address flow and time-proportional samplers and other automatic sampling devices. 1.4 Samples are taken from a flowing waste stream or moving waste mass and, therefore, are descriptive only within a certain period. The length of the period for which a sample is descriptive will depend on the sampling frequency and compositing scheme. 1.5 It is recommended that these practices be used in conjunction with Guide D4687 . 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. See Section 5 for more information. 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 ====== 4.1 The procedure outlined in these practices are guides for obtaining descriptive samples of solid, semisolid, and liquid waste from flowing streams, and incorporate many of the same procedures and equipment covered in the Referenced Documents. These practices by themselves will not necessarily result in the collection of samples representative of the total waste mass. The degree to which samples describe a waste mass must be estimated by application of appropriate statistical methods and measures of quality assurance. It is recommended that those practices be used in conjunction with Guide D4687 .