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Citation: ZHANG Jian-Ying, LI Xin-Ni, ZHOU Tao, ZHOU Yuan-Jing, JIAO Hui, SONG Dan, HAN Lian-Shan. Measurement of Key Elements in Rare Earth Alloy by Pulsed Glow Discharge Mass Spectrometry[J]. Chinese Journal of Analytical Chemistry, ;2018, 46(5): 757-764,786. doi: 10.11895/j.issn.0253-3820.171503 shu

Measurement of Key Elements in Rare Earth Alloy by Pulsed Glow Discharge Mass Spectrometry

¹ National Institute of Metrology, Beijing 100013, China;
² Hangzhou Dianzi University, Hangzhou 310018, China

Received Date: 12 December 2017
Revised Date: 13 February 2018

Fund Project: This work was supported by the National Key Resarch & Development Program of China (No. 2017YFF0205802).

Pulsed glow discharge mass spectrometric (Pulsed-GDMS) method for the measurement of 7 kinds of key elements (Mg, Fe, Cu, La, Ce, Pr and Nd) in rare earth alloys was established. The influence factors of measurement repeatability, such as pulse time, sample homogeneity, anode cap, flow tube, corn, and sample tablet density were systematically studied. The results showed that, for elements with mass fraction of more than mg/g, the parts (anode cap, flow tube and corn) had the largest influence on measurement repeatability. When the new graphitic parts were used and no parts were changed during the whole measurement, the relative standard deviation (RSD) was less than 3%. However, the RSD were 2%-11% and 3%-21% when the new graphitic parts and the reusable parts were used and changed, respectively. The second influence factor of measurement repeatability was the tablet density. The results showed that, the lower the density, the worse the measurement repeatability, and for the dense tablet, the RSD was less than 3%. Key elements in 1# rare earth alloy were measured by high resolution inductively coupled plasma-mass spectrometry (HR-ICP-MS), and the analytical results were used as reference values for the calibration of Pulsed-GDMS. The relative sensitivity factors (RSF) were obtained, and the key elements in 2# rare earth alloy were measured by Pulsed-GDMS after calibration. The analytical results of key elements in 2# sample by Pulsed-GDMS and HR-ICP-MS were compared, and the results showed that for the dense sample, the analytical results showed good agreement. Under the optimal conditions, the expanded uncertainty of measurement by Pulsed-GDMS reduced to 3%-10%.
- Pulsed-glow discharge mass spectrometry,
- Measurement repeatability,
- Parts changing,
- Tablet density,
- Rare earth alloy
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