1.1 这些测试方法包括通过Brunauer、Emmett和Teller（B.E.T.）的单点近似测量沉淀水合二氧化硅表面积的程序 2. 多层气体吸附理论。这些测试方法规定了样品制备和处理、仪器校准、实验数据所需的准确性和精密度，以及根据获得的数据计算表面积结果。 1.2 这些试验方法用于确定100至500 m范围内的单点氮表面积 2. /g。 1.3 以国际单位制表示的数值应视为标准。 括号中的值仅供参考。 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）。本标准的用户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。 最低安全设备应包括防护手套、牢固的眼睛和面部防护。 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====== 4.1 这些测试方法使用B.E.T.方法的近似值测量氮分子可用的沉淀水合二氧化硅的近似表面积。虽然普遍认为B.E.T.方法的多点版本不太容易因单个样品的不同表面特性而产生误差，但由于每次测试的时间较短，且所需仪器相对简单，单点近似通常是足够的。近红外光谱的质量控制应用和对比测试- 具有紧密化学和微观结构组成的相同样品可能是最有价值的应用。

1.1 These test methods cover a procedure to measure the surface area of precipitated hydrated silicas by, a single point approximation of the Brunauer, Emmett, and Teller (B.E.T.) 2 theory of multilayer gas adsorption. These test methods specify the sample preparation and treatment, instrument calibrations, required accuracy and precision of experimental data, and calculations of the surface area results from the obtained data. 1.2 These test methods are used to determine the single point nitrogen surface areas in the range of 100 to 500 m 2 /g. 1.3 The values stated in SI units are to be regarded as the standard. The values 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. The minimum safety equipment should include protective gloves, sturdy eye and face protection. 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 ====== 4.1 These test methods measure the approximate surface area of precipitated hydrated silicas that is available to the nitrogen molecule using an approximation of the B.E.T. method. While the multi-point version of the B.E.T. method is generally accepted as being less prone to errors arising from the varying surface properties of individual samples, the single-point approximation is often adequate due to the shorter time per test and relative simplicity of the instrumentation needed. Quality control applications and comparative tests on near-identical samples of close chemical and micro-structural composition are likely to be the applications of greatest value.