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| Evaluation of the Uncertainty in the Measurement of Specific Surface Area of Solids by Nitrogen Adsorption Using Static Volumetric Method |
| YAN Xiao-ying1,GAO Yuan2,GUO Yan-jun1 |
1. National Center for Nanoscience and Technology, Beijing 100190, China
2. Beijing Center for Physical & Chemical Analysis, Beijing 100089, China |
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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).
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Received: 05 December 2016
Published: 11 August 2017
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［1］GB/T 19587—2004气体吸附BET法测定固态物质比表面积［S］, 2004.
［2］Paul A W, Clyde O. Analytical Methods in Fine Particle Technology［M］. USA: Micromeritics Instrument Corporation, 1997.
［3］邵建新,刘云虎,张子英.测量结果及其不确定度有效位数确定问题［J］.计量学报,2013,34(3):300-304.
［4］荆学东,陈芷,张智慧,等. 基于FFT的舍入不确定度评估［J］.计量学报,2016, 37(1): 105-108.
［5］欧俊豪,王家生,徐漪萍,等.应用概率统计［M］.天津:天津大学出版社,1999.
［6］薛长利,刘伟强,丁勤,等.氦质谱正压累积检漏不确定度评定的最小二乘法应用研究［J］.真空科学与技术学报,2014,34(4):210-215.
［7］方兴华,宋明顺,顾龙芳,等.基于自适应蒙特卡罗方法的测量不确定度评定［J］.计量学报,2016,37(4):452-456.
［8］JJF 1059.1—2012 测量不确定度评定与表示［S］, 2012.
［9］李慎安.测量仪器示值误差不确定度与最大允许误差［J］.中国计量,2003,(8):66-67.
［10］丁慎训,张连芳,张孔时.物理实验教程［M］.北京:清华大学出版社,2002.
［11］谢洪波.浅谈电子天平称重的测量不确定度［J］.工业计量,2016,26(4):44-46. |
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2017, Vol. 38 
