This paper introduces the geometric assumptions and neglects of the pore size distribution calculated by BJH method, the arithmetic approximation for simplified calculation, the derivation process of each parameter, the calculation steps and key points of the pore size distribution. This paper also introduces the application scope of BJH method at the current instrument level, and how to further integrate the data. In order to get the required analysis and test report, references are provided

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... r the subsequent adjustment of test parameters and improvement of test methods. Some problems often encountered in reading experimental reports are also discussed. 现在大多数分析仪器的测试都采用计算机控制、采集信息及用配套软件处理数据,这为分析和 测试提供了很大方便,不过,这同时也带来一些风险,如若不考虑样品及测试的具体情况、贸然用 软件默认的模板生成的测试报告其可信度就要特别注意。相对其他仪器,在使用静态体积法孔隙分 析仪器的学生中发生此类风险会多一些,笔者认为其原因有二:一是不了解静态体积法气体吸附测 试孔径分布是建立在人为假设上的;二是不了解孔径分布的相关参数设定对计算过程和对分析测试 结果的影响。有吸附仪器应用专家直接指出:若简单地相信气体吸附仪预置的报告模板出的分析数 据,对复杂微介孔材料的分析则可能得出错误或虚假的结论 [1] 。 本文试着以中华人民共和国国家标准 GB/T21650.2-2008《压汞法和气体吸附法测定固体材料孔 径分布和孔隙度 第 2 部分:气体吸附法分析介孔和大孔》 [2] (以下简称"标准")思路介绍 Barret、 Joyner 和 Halenda 方法 [3] (以下简写为 BJH 方法)计算介孔孔径分布的过程和步骤。帮助学生了解介 No. 2