1.1 本规程涵盖了使用溶剂提取残留物从火灾碎片样品中去除少量可燃液体残留物的程序。 1.2 这种做法适用于提取各种浓度的可燃液体残留物。 1.3 参考文件中列出了备用分离和浓缩程序（实践 E1388 ， E1412 ， E1413 ， E2154 和 E3189 )。 1.4 以国际单位制表示的数值应视为标准。本标准中不包括其他计量单位。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ===意义和用途====== 4.1 本规程适用于制备火灾碎片的提取物，以便随后通过气相色谱-质谱法进行分析（见试验方法 E1618 )。 4.2 这种做法有助于减少分离过程中的潜在分馏，例如在试图区分不同等级的燃料油时。 4.3 这种做法对于从玻璃等无孔表面或燃烧过的容器内部提取特别有用。它也非常适合从不适合使用实践提取的样品中提取可燃液体残留物 E1412 。 4.4 这种做法缺乏将可燃液体与火灾碎片中存在的干扰化合物分离和隔离的特异性。 4.5 这种做法不适用于提取极易挥发的化合物和易燃液体（例如丙酮、丁烷、乙醇、丙烷、一些打火机液体），这些液体可能在浓缩步骤中蒸发。 4.6 这是一种破坏性的技术。只要可能，只有当样品的代表性部分可以保留下来进行再分析时，才应使用该技术。经过此程序的样品部分可能不适合重新取样。如果样本脱落是一个问题，则使用无损提取技术（例如，实践 E1412 ， E2154 )应在该技术之前使用。

1.1 This practice covers the procedure for removing small quantities of ignitable liquid residue from samples of fire debris using solvent to extract the residue. 1.2 This practice is suitable for extracting ignitable liquid residues over a wide range of concentrations. 1.3 Alternate separation and concentration procedures are listed in the referenced documents (Practices E1388 , E1412 , E1413 , E2154 , and E3189 ). 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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. 1.6 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 This practice is useful for preparing extracts from fire debris for subsequent analysis by gas chromatography-mass spectrometry (see Test Method E1618 ). 4.2 This practice is useful to reduce potential fractionation during separation, such as when attempting to distinguish between various grades of fuel oil. 4.3 This practice is particularly useful for extraction from nonporous surfaces such as glass, or the interior of burned containers. It is also well suited to the extraction of ignitable liquid residues from samples that are not amenable to extraction using Practice E1412 . 4.4 This practice lacks specificity to separate and isolate ignitable liquids from interfering compounds present in the fire debris. 4.5 This practice is not suitable for the extraction of extremely volatile compounds and ignitable liquids (for example, acetone, butane, ethanol, propane, some cigarette lighter fluids), which could evaporate during the concentration step. 4.6 This is a destructive technique. Whenever possible, this technique should only be used when a representative portion of the sample can be preserved for reanalysis. Those portions of the sample subjected to this procedure could be unsuitable for resampling. If sample spoliation is an issue, a nondestructive extraction technique (for example, Practices E1412 , E2154 ) should be used prior to this technique.