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| 氮气吸附静态容量法测定固体材料比表面积不确定度评定 | |
| 引用本文： | 闫晓英,高原,郭延军.氮气吸附静态容量法测定固体材料比表面积不确定度评定[J].计量学报,2017,38(5):543-547. |
| 作者姓名： | 闫晓英 高原 郭延军 |
| 作者单位： | 1. 国家纳米科学中心, 北京 100190 2. 北京市理化分析测试中心, 北京 100089 |
| 摘 要： | 氮气吸附静态容量法是测定固态材料比表面积最常用的方法,以吸附质和吸附剂发生多层物理吸附为基础,使用商用比表面积分析仪,依据标准GB/T 19587-2004《气体吸附BET法测定固态物质比表面积》测量了α-氧化铝的比表面积;详细分析了仪器测试过程中各个环节带来的不确定度分量,得出:不确定度主要来源于仪器校准、质量称量的重复性以及线性最小二乘法拟合数据,最后计算得到测量结果为(79.3±3.4)m2/g(k=2)。 |
| 关 键 词： | 计量学 比表面积 不确定度 最小二乘法 |
| 收稿时间： | 2016-12-05 |
Evaluation of the Uncertainty in the Measurement of Specific Surface Area of Solids by Nitrogen Adsorption Using Static Volumetric Method |
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| YAN Xiao-ying,GAO Yuan,GUO Yan-jun.Evaluation of the Uncertainty in the Measurement of Specific Surface Area of Solids by Nitrogen Adsorption Using Static Volumetric Method[J].Acta Metrologica Sinica,2017,38(5):543-547. | |
| Authors: | YAN Xiao-ying GAO Yuan GUO Yan-jun |
| Affiliation: | 1. National Center for Nanoscience and Technology, Beijing 100190, China 2. Beijing Center for Physical & Chemical Analysis, Beijing 100089, China |
| Abstract: | Nitrogen adsorption using static volumetric method was commonly used to determine the specific surface area of solids,it is based on the theory of multimolecular layer physical adsorption.A case study was reported for evaluating the uncertainty of the measurement results,where α-Al2O3 was measured using commercial instrument in accordance with the standard GB/T 19587-2004,determination of the specific surface area of solids by gas adsorption using the BET method.The uncertainty was analyzed in detail in each process of the testing.The main uncertainty components were identified as calibrating instruments,repeatability of mass weighing and least square fitting of data.The measurement result is (79.3 ±3.4) m2/g (k=2). |
| Keywords: | metrology specific surface area uncertainty of measurement least square method |
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