1.1 本规程描述了从钻孔中回收的岩芯中收集和处理煤样的程序。 1.2 单位- 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。每个系统中规定的值不一定是精确的等价物；因此，为确保符合本标准，每个系统应独立使用，且两个系统的值不得组合。 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 适当采集的样本（包括总煤层间隔）提供的样本是采样点处煤层的代表性横截面。取芯样本进行后续测试，以评估煤质和表征，进行商业评估，规划采矿作业以保持煤质，根据分类确定煤级 D388页 ，用于地质煤炭资源研究。 注1: 由于可能存在横向变化，一个样本可能无法代表另一个样本点的煤层质量。从岩芯样本生成的数据的可靠性取决于样本点的数量和间距以及给定区域内煤炭特征的可变性。 5.2 应考虑直接从芯样中测定的水分 可疑 由于可能受到钻井液和地下水的污染，在任何岩芯样本中。如果需要对岩芯样品（某些低秩煤除外）的固有含水量进行更具代表性的估计，则应根据试验方法对样品进行分析 D1412 .

1.1 This practice describes procedures for collecting and handling a coal sample from a core recovered from a borehole. 1.2 Units— The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 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 A properly collected sample that includes the total coal bed interval provides a sample that is a representative cross section of the coal bed at the point of sampling. Core samples are taken for subsequent testing needed for evaluation of coal quality and characterization for commercial evaluations, for planning of mining operations to maintain coal quality, for the determination of coal rank in accordance with Classification D388 , and for geologic coal resource studies. Note 1: Because of the potential for lateral variability, a sample may not represent the quality of the coal bed at another sample point. The reliability of the data generated from core samples is dependent on the number and spacing of the sample points and the variability of the coal characteristics in a given area. 5.2 Moisture determined directly from a core sample shall be considered questionable in any core sample because of possible contamination from drilling fluids and groundwater. If a more representative estimate of the inherent moisture content of the core sample (with the exception of certain low-rank coals) is desired, the sample should be analyzed according to Test Method D1412 .