Evaluation of Measurement Uncertainty for the Determination of MgO in Magnesia Refractories by XRF

2018 ◽  
Vol 768 ◽  
pp. 36-40
Author(s):  
Qing Dan Yuan ◽  
Shi Hua Liu ◽  
Qian Nan Li ◽  
Wei Han
Keyword(s):  
Measurement Uncertainty ◽  
Mathematical Models ◽  
Magnesium Oxide ◽  
Oxide Content ◽  
Refractory Materials ◽  
Melting Method ◽  
X Ray ◽  
Measurement Results ◽  
Synthetic Standard

The method of X-ray fluorescence spectrometry (XRF) for the determination of MgO in magnesia refractories was introduced. The uncertainty of the MgO in refractory materials was analyzed by melting method of XRF. The measurement uncertainty was evaluated, and the related mathematical models was established. The uncertainty of synthetic standard was calculated by the evaluation of the uncertainty of each component standard. And eventually converted to the measurement results to expand the uncertainty. The effects of two melting methods on the uncertainty of magnesium oxide content were compared.

Evaluation of Uncertainty for the Determination of Magnesium Oxide Content in Limestone by the Atomic Absorption Spectrometry

2014 ◽  
Vol 707 ◽  
pp. 283-288
Author(s):  
Xiang Dong Wen ◽  
Zheng Zhou ◽  
Wen Yang Pan ◽  
Mei Shao
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Magnesium Oxide ◽  
Influence Factors ◽  
Absorption Spectrometry ◽  
Oxide Content ◽  
Standard Solution ◽  
The Mathematical Model

According to GB/T3286.1-2012(The determination of calcium oxide and magnesium oxide content in limestone and dolomite), the mathematical model of magnesium oxide content determination in limestone by atomic absorption spectrometry was established. The various uncertainty factors of different elements for a sample were discussed and compared in the testing process. The confidence interval for the measurement result was (0.74±0.03)%,k=2 in uncertainty evaluation .The results showed that the variability of working curve and accuracy of standard solution volume for working curve were main influence factors of uncertainty. It could effectively reduce the uncertainty from the perspective of the main factors,and improve the quality of analysis.

scholarly journals Determination of probe non-linearity and error due to measurement position for direct measurement type of gauge block comparator and its measurement uncertainty

2021 ◽  
Vol 2145 (1) ◽  
pp. 012060
Author(s):  
A Pringkasemchai ◽  
J Wongsaroj ◽  
K Mongkolsuttirat
Keyword(s):  
Measurement Uncertainty ◽  
Direct Measurement ◽  
Comparative Method ◽  
Standard Uncertainty ◽  
Simple Linear Regression ◽  
Measuring Range ◽  
Gauge Block ◽  
Measurement Results ◽  
Accuracy Of Measurement

Abstract The non-linearity of probes is one of the important components in gauge block calibration by the mechanical comparative method of two gauges blocks at the same nominal length. However, an advanced method for gauge block calibration is a mechanical direct measurement method of two gauge blocks showing the greatest difference in nominal length of 25 mm. This method uses a special probe based on the interferential scanning principle to produce the signals to measure the displacement. In this paper, non-linearity and error due to measurement position were investigated as they related to the accuracy of measurement results. The differences in central length of pairs of standard gauge blocks made of steel were measured by optical interferometry with the measurement uncertainty (k=2) 23 nm. Length in the range of 5 μm to 25 mm was used in the experiment. Non-linearity of the probe was evaluated by the simple linear regression model. Various factors such as origin setting point, temperature, and vibration have been analysed. In the preliminary experiment, the non-linearity, position error, repeatability and retrace error over the measuring range 25 mm are 13 nm, -18 nm, 15 nm, and 10 nm respectively. The standard uncertainty of direct measurement type caused by non-linearity is 4 nm.

scholarly journals Determination of measurement uncertainty as a necessary condition confirming the reliability of measurement results

Rail Vehicles ◽  
2019 ◽  
pp. 39-49
Author(s):  
Joanna Wojtukiewicz
Keyword(s):  
Measurement Uncertainty ◽  
Necessary Condition ◽  
Measurement Results ◽  
Reliability Of Measurement Results

W artykule zawarto najważniejsze zagadnienia związane z wyznaczaniem niepewności pomiaru oraz z przedstawianiem wiarygodnych wyników pomiarów. Przedstawiono m.in. najważniejsze pojęcia dotyczące niepewności pomiaru, wymagania normatywne, źródła, cel oraz metody wyznaczania niepewności pomiaru. Artykuł zawiera również odniesienie do czynności metrologicznych wykonywanych w Laboratorium Badań Pojazdów Szynowych w celu spełnienia przedstawionych wymagań.

scholarly journals Fluorescent X-ray spectrometric determination of sulfuric anhydride and magnesium oxide in the cements

1962 ◽  
Vol 11 (2) ◽  
pp. 182-188
Author(s):  
Hiroshi UCHIKAWA ◽  
Yoshizo INOMATA ◽  
Toru INOUE
Keyword(s):  
Magnesium Oxide ◽  
Sulfuric Anhydride ◽  
X Ray

scholarly journals Spectrophotometric determination of magnesium oxide content in supplements of magnesium

2019 ◽  
Vol 68 (5-6) ◽  
pp. 197-200
Author(s):  
Šaćira Mandal ◽  
Amra Alispahić ◽  
Alema Dedić ◽  
Hurija Džudžević Čančar
Keyword(s):  
Magnesium Oxide ◽  
Spectrophotometric Determination ◽  
Divalent Cation ◽  
Magnesium Deficiency ◽  
Essential Element ◽  
Oxide Content ◽  
Magnesium Ions ◽  
Eriochrome Black T ◽  
Magnesium Supplement

Magnesium is an essential element and the intracellular divalent cation involved in many biochemical functions. People with magnesium deficiency must increase their intake of magnesium, usually in the form of various supplements. A common form of magnesium supplement widely available in pharmacies is magnesium oxide (MgO). In this work, the content of MgO was determined in pharmaceutical supplementations using spectrophotometry, based on the reaction between magnesium ions and eriochrome black T at a wavelength of 535 nm. The analysed content of MgO ranged from 360.5 to 386.5 mg MgO, which corresponds to the daily Mg recommended values (300 to 400 mg).

scholarly journals Calculation of Misjudgment Probability for Product Inspection Based on Measurement Uncertainty

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Xiao-huai Chen ◽  
Yin-bao Cheng ◽  
Han-bin Wang ◽  
Hong-li Li ◽  
Zhen-ying Cheng ◽  
...  
Keyword(s):  
Measurement Uncertainty ◽  
Conditional Probability ◽  
Probability Model ◽  
Probability Models ◽  
Estimation Formula ◽  
Sampling Inspection ◽  
Measurement Results ◽  
Absolute Probability ◽  
Selection Of

It is important to research into the misjudgment probability of product inspection based on measurement uncertainty, which is of great significance to improve the reliability of inspection results. This paper mainly focused on total inspection and sampling inspection methods and regarded the misjudgment probability as the index to provide quantitative misjudgment risk results for both producer and consumer sides. Through the absolute probability and the conditional probability model, the estimation formula of the total inspection misjudgment rate is deduced, respectively, and the calculation methods of qualification determination and misjudgment rate of the full inspection results are studied. According to the total inspection misjudgment rate, the methods of misjudgment rate of sampling inspection and qualification determination of measurement results are researched. The misjudgment rate of measurement results is calculated based on the exhaustive method and the Monte-Carlo simulation. The estimation results show that the misjudgment probabilities calculated by absolute probability models can be used as the basis for the selection of the measurement plan for product inspection. The misjudgment probability calculated by conditional probability models is more directly to reflect the risks for both producer and consumer sides, and it prompts inspectors to make decisions more carefully.

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