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| Determination of Rare Earth Elements in High Tungsten-bearing Samples by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) |
| Received:July 15, 2023 Revised:December 08, 2023 |
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| DOI：10.3969/j.issn.2095-1035.2024.04.011 |
| KeyWord:ICP-MS;rare earth element;high tungsten-bearing sample |
| Author | Institution |
| TANG Disheng |
江西理工大学国家市场监管重点实验室稀土产品检测与溯源） |
| YANG Wanqing |
江西理工大学国家市场监管重点实验室稀土产品检测与溯源） |
| ZHANG Yu |
江西理工大学国家市场监管重点实验室稀土产品检测与溯源） |
| AO Duoduo |
江西理工大学国家市场监管重点实验室稀土产品检测与溯源） |
| ZHENG Tengfei |
江西理工大学国家市场监管重点实验室稀土产品检测与溯源） |
| SUN Yijian |
江西理工大学国家市场监管重点实验室稀土产品检测与溯源） |
| JIN Lanlan |
中国地质大学武汉）生物地质与环境地质国家重点实验室 |
| KE Yuqiu |
江西理工大学国家市场监管重点实验室稀土产品检测与溯源） |
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| Abstract: |
| Accurate determination of rare earth elements (REEs) in high tungsten-bearing samples is significant for geochemistry research and synthesis of high-performance tungstate laser crystals.In order to investigate the influence of matrix compositions, such as high tungsten and high content of cations, on the results obtained by inductively coupled plasma-mass spectrometry (ICP-MS), several high tungsten-bearing samples such as Na2WO4, CaWO4, NaY(WO4)2, MnWO4 and (Fe,Mn)WO4 were digested by HNO3 and HF, doped with REEs, and diluted by 2% HNO3 solution. It was treated as the matrix-matched solutions, and the relative sensitivity coefficients (RSC) of REEs in which were compared with those in the non-matrix-matched solutions (i.e., 2% HNO3 only doped with REEs). No obvious difference of RSC was found among these solutions with relative deviation less than 15%, which indicates that the influence of matrix effects induced by high tungsten and high content of cations in high tungsten-bearing samples is negligible. Then, a methodology for accurate determination of REE contents by ICP-MS was developed. It was found that good liner relationship (R2 ? 0.9997), low detection limit (0.5 - 27.9 pg·g-1) and desirable accuracy (relative error: -6.25 - 10.74%) were obtained. It was further used to determine the REE contents in the real CaWO4 single crystals. The results are close to those determined by matrix-matched ICP-MS with relative deviation of 0.80 - 12.75%. It demonstrates that the proposed method can be used to accurately determine REE contents in the high tungsten-bearing samples. |
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