1.1 该试验方法包括通过气相色谱法测定甲基异丁基酮（MIBK）的纯度，此外还提供了一种测量感兴趣的某些杂质（如甲基异丁基甲醇）的方法。水和酸度等杂质通过其他适当的ASTM程序进行测量，结果用于归一化色谱值。 1.2 以下内容适用于本标准中的所有规定限值；为了确定是否符合本标准，观察值或计算值应按照实践中的四舍五入方法，在表示规格限值时使用的最后一个右手数字中“四舍五舍五入到最近的单位” E29 。 1.3 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.4 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。 1.5 有关具体的危险信息和指南，请参阅本测试方法中列出的材料的供应商安全数据表。 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 该测试方法提供了对市售甲基异丁基酮中常见杂质的测量。这些杂质的测量及其结果可以单独地或当从100中相加和减去时（测定）用于规格验收。

1.1 This test method covers the determination of the purity of methyl isobutyl ketone (MIBK) by gas chromatography and in addition provides a means for measuring certain impurities such as methyl isobutyl carbinol which are of interest. Impurities such as water and acidity are measured by other appropriate ASTM procedures and the results are used to normalize the chromatographic value. 1.2 The following applies to all specified limits in this standard; for purposes of determining conformance with this standard, an observed value or a calculated value shall be rounded off “to the nearest unit” in the last right-hand digit used in expressing the specification limit, in accordance with the round-off method of Practice E29 . 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.4 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. 1.5 For specific hazard information and guidance, see the supplier’s Safety Data Sheet for the materials listed in this test method. 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 test method provides a measurement of commonly found impurities in commercially available methyl isobutyl ketone. The measurement of these impurities and the results thereof can individually or when totaled and subtracted from 100 (assay) be used for specification acceptance.