LV Li-juan, JIANG Ying, ZHAO Jian, et al. Uncertainty Evaluation of Total Error from Instrument Indicated Value for Determining pH of Water Extract of Chinese Materia Medica[J]. Chinese journal of experimental traditional medical formulae, 2013, 19(13): 1-3.
DOI:
LV Li-juan, JIANG Ying, ZHAO Jian, et al. Uncertainty Evaluation of Total Error from Instrument Indicated Value for Determining pH of Water Extract of Chinese Materia Medica[J]. Chinese journal of experimental traditional medical formulae, 2013, 19(13): 1-3. DOI: 10.11653/syfj2013130001.
Uncertainty Evaluation of Total Error from Instrument Indicated Value for Determining pH of Water Extract of Chinese Materia Medica
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 U95was 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.