中药材水提液pH测定中仪器示值总误差的不确定度评定  

Uncertainty Evaluation of Total Error from Instrument Indicated Value for Determining pH of Water Extract of Chinese Materia Medica

作　　者：吕丽娟[1,2] 姜瑛[2] 赵健[2] 李旻辉[3] 

机构地区：[1]天津农学院基础科学系,天津300384 [2]天津泰普药品科技发展有限公司,天津300193 [3]包头医学院,内蒙古包头014060

出　　处：《中国实验方剂学杂志》2013年第13期1-3,共3页Chinese Journal of Experimental Traditional Medical Formulae

基　　金："十二五"国家科技支撑计划项目(2012BAI28B002);国家自然科学基金项目(81160504;81060372);教育部科学技术研究重点项目(211032);中医药行业科研专项(201107009)

摘　　要：目的:评定中药材水提液pH测定中仪器示值总误差的不确定度。方法:选取pH一级标准物质,采用标准溶液测量法进行评定。结果:影响pH计示值总误差不确定度的主要因素包括测量重复性、标准溶液及液接界电势,不确定度U95=0.012 pH。结论:该pH计示值总误差测量结果的不确定度评定方法准确可靠,可为中药材水提液的pH定值分析方法研究及其不确定度评定提供实验依据。Objective： To evaluate uncertainty of total error from instrument indicated value in pH determination of Chinese herbals water extract. Method： Primary pH standard substance was used and standard solution measurement was selected for evaluation. Result： Main factors affecting uncertainty of total error for pH meter＇ s indicated value were measuring repeatability, standard solution and the liquid junction potential, and the assessed uncertainty U95 was 0. 012pH. Conclusion： Evaluation method for uncertainty introduced in this article was accurate and reliable, it could provide scientific basic data for study on valuation and uncertainty evaluation of pH value of Chinese herbals water extract.

关 键 词：中药材水提液 PH计 不确定度 

分 类 号：R283.6[医药卫生—中药学]