1.1 本试验方法包括在丙酮中测定碱度，碱度以氨（NH 3. )。 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，观测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。本标准中不包括其他计量单位。 1.4 有关具体的危险信息和指南，请参阅供应商的安全数据表。 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。 具体危害说明见第节 7. 。 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 该试验方法可测量丙酮中的碱度。该测量结果可用于规范验收。

1.1 This test method covers the determination in acetone of alkalinity calculated as ammonia (NH 3 ). 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 rounding-off method of Practice E29 . 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 For specific hazard information and guidance, consult the supplier’s Safety Data Sheet. 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. Specific hazard statements are given in Section 7 . 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 alkalinity in acetone. The results of this measurement can be used for specification acceptance.