1.1本试验方法涵盖丁二烯浓缩物（回收级和规范级）中丁二烯二聚体（4-乙烯基环己烯-1）和苯乙烯的测定。 1.2以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 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和健康实践，并确定监管限制的适用性。 具体预防说明见第6节和第8节。 ====意义和用途====== 丁二烯二聚体和苯乙烯可能作为杂质存在于商用丁二烯中。本试验方法适用于内部质量控制和制定产品规范。

1.1 This test method covers the determination of butadiene dimer (4-vinylcyclohexene-1) and styrene in butadiene concentrates, both recycle and specification grade. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this 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 and health practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements see Sections 6 and 8. ====== Significance And Use ====== Butadiene dimer and styrene may be present as impurities in commercial butadiene. This test method is suitable for use in internal quality control and in establishing product specifications.