1.1 本试验方法涵盖了对各种石油产品紫外线吸收的测量。它涵盖了在220范围内的波长下液体的吸收率或液体和固体的吸收率，或两者兼而有之 nm至400 nm的光谱。 1.2 本试验方法的使用意味着测量波长、溶剂（如有）、样品路径长度和样品浓度的条件是通过参考附件中本试验方法应用的一个示例或通过其他测量条件的说明来规定的。 1.3 该试验方法的应用实例包括精炼石油蜡的吸收率和USP矿脂的吸收率。 1.4 以国际单位制表示的数值应视为标准。括号中以华氏度、英尺和英寸表示的值仅供参考。 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。 有关具体的警告语句，请参阅 7.3.1 ， 7.3.3 和 13.4 。 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====== 5.1 液体的吸收率以及液体和固体在特定波长下在紫外线下的吸收率可用于表征石油产品。

1.1 This test method covers the measurement of the ultraviolet absorption of a variety of petroleum products. It covers the absorbance of liquids or the absorptivity of liquids and solids, or both, at wavelengths in the region from 220 nm to 400 nm of the spectrum. 1.2 The use of this test method implies that the conditions of measurement—wavelength, solvent (if any), sample path length, and sample concentration—are specified by reference to one of the examples of the application of this test method in the annexes or by a statement of other conditions of measurement. 1.3 Examples of the application of this test method are the absorptivity of refined petroleum wax, and the absorptivity of USP petrolatum. 1.4 The values stated in SI units are to be regarded as the standard. The values stated in Fahrenheit, feet, and inches, indicated in parentheses, are for information only. 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. For specific warning statements, see 7.3.1 , 7.3.3 , and 13.4 . 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 ====== 5.1 The absorbance of liquids and the absorptivity of liquid and solids at specified wavelengths in the ultraviolet are useful in characterizing petroleum products.