1.1 本规程涵盖了使用反射光照明在显微镜下制备用于检查的粒状和块状煤炭样品的蚀刻抛光表面的实验室程序。 1.2 单位- 以国际单位制表示的数值应视为标准值。国际单位制后括号中给出的值仅供参考，不被视为标准值。 1.3 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。 1.4 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 根据本规程的实验室程序制备的煤样品表面观察到的成分将具有差异浮雕，这将有助于通过视觉分类识别其显微组分，并能够识别形成煤的植物部分或组织。 5.2 根据试验方法，本规程制备的样品可用于微观测定煤的物理成分的体积百分比 D2799 . 5.3 通过本规程制备的样品可用于通过直读序列对植物成分进行显微镜鉴定。用于此目的的样品应限于明亮岩石类型的富含铁闪锌矿和半丝质矿的煤，以最大限度地利用蚀刻的反馈。

1.1 This practice covers laboratory procedures for preparing an etched, polished surface of granular and block samples of coal for examination with a microscope using reflected light illumination. 1.2 Units— The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.3 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. 1.4 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 Components observable in surfaces of coal samples prepared in accordance with the laboratory procedures of this practice will have differential relief that will aid in their maceral identification by visual classification and enables identification of plant parts or tissues that formed the coal. 5.2 Samples prepared by this practice can be used for microscopical determination of the volume percent of physical components of coal in accordance with Test Method D2799 . 5.3 Samples prepared by this practice can be used for the microscopical identification of botanical components by taphonomic rank. Samples for this purpose should be limited to telovitrinite and semifusinite rich coals of bright lithotype to maximize feedback from etching.