Abstract：Currently, bottom-up technique based on GUM is the main method for the evaluation of measurement uncertainty. However, the main drawbacks of bottom-up technique that restricts its more frequent application in evaluation of uncertainty for chemical analysis is its complicated evaluation steps, subcomponents of measurement uncertainty could be easily omited or double counted, and some subcomponents are difficult to quantify accurately- The quality assurance and control charting methods based on top-down technique, which is used to evaluate measurement uncertainty for the determination of SiO2 in marine sediments, are described in this study The quality control data, accumulated in routine analysis of SiO2 in marine sediments national certified reference materials GBW07309, was used to evaluate uncertainty The normality parameters A2*(s) and A2*(MR) were 0.870 and 0.787, respectively And the precision and systematic error of quality control data were also evaluated, the value of SR′and |x〖DD(〗-〖DD)〗-RQV | was less than 0.254 and 0.40, respectively Moreover, there was no out-of-control points in the individual value plot and moving range control chart, which indicated that the data was under a controlled state, consequently, the intermediate precision (SR′) was the measurement uncrtainty The proposed method proved to be simple and practical, and was appropriate for evaluation of measurement uncertainty in the X-ray fluorescence analysis field
李强,张学华,黄雪华. X射线荧光光谱法测定海洋沉积物中二氧化硅的测量不确定度评定[J]. 冶金分析, 2014, 34(10): 78-82.
LI Qiang, ZHANG Xue hua, HUANG Xue hua. Evaluation of measurement uncertainty for the determination of silicon dioxide in marine sediments by X-ray fluorescence spectrometry. , 2014, 34(10): 78-82.
