1.1 本试验方法涵盖使用氮-氦流动气体混合物单点测定呈现II型或IV型氮吸附等温线的催化剂和催化剂载体的表面积。本试验方法适用于测定0.1至300 m的总表面积 2. ，需要快速测定表面积。 1.2 由于单点方法使用BET方程的近似值，因此多点BET方法（测试方法 D3663 )优于单点法。 1.3 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。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前咨询并建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 该测试方法有助于测定催化剂和催化剂载体的比表面积，用于材料规范、制造控制以及催化剂评估中的研发。

1.1 This test method covers the single-point determination of the surface area of catalysts and catalyst carriers that exhibit Type II or Type IV nitrogen adsorption isotherms using a nitrogen-helium flowing gas mixture. This test method is applicable for the determination of total surface areas from 0.1 to 300 m 2 , where rapid surface area determinations are desired. 1.2 Because the single-point method uses an approximation of the BET equation, the multipoint BET method (Test Method D3663 ) is preferred to the single-point method. 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 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 consult and establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 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 This test method is useful for determining the specific surface area of catalysts and catalyst carriers for material specifications, manufacturing control, and research and development in the evaluation of catalysts.