Combining Rare Earth Element Analysis and Chemometric Method to Determine the Geographical Origin of Nephrite
Nephrite is a high-valued gem material, whose geographical origin determination is a topic of interest to both consumers and producers since the geographic origin determines its price and reputation. In the present study, we suggest a two-step method for discriminating geographical origins of nephri...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-10-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/12/11/1399 |
| _version_ | 1797467207962198016 |
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| author | Yue Su Mingxing Yang |
| author_facet | Yue Su Mingxing Yang |
| author_sort | Yue Su |
| collection | DOAJ |
| description | Nephrite is a high-valued gem material, whose geographical origin determination is a topic of interest to both consumers and producers since the geographic origin determines its price and reputation. In the present study, we suggest a two-step method for discriminating geographical origins of nephrite based on the rare earth element (REE) contents combined with chemometrics. In the first step, the REE contents of nephrite samples were determined by laser ablation-inductively coupled plasma mass spectrometry (LA-ICP-MS), combined with previously reported data—the chondrite-normalized REE distribution pattern; the REE parameters of nephrite samples from six origins, namely Xinjiang, Qinghai, Russia, Guangxi, Guizhou, and Liaoning were then compared. In the second step, origin discriminant models were established by linear discriminant analysis (LDA), and the accuracy of the model was evaluated by leave-one-out cross-validation (LOOCV). The results showed that the REE contents were significantly different among the six nephrite origins with regional characteristics, which makes it possible to trace the origin. Using chondrite-normalized REE distribution patterns, the six nephrite origins can be divided into three separate groups: Xinjiang−Qinghai−Russia, Luodian−Dahua, and Xiuyan. Xiuyan nephrite can be directly distinguished from the other origins due to its unique REE distribution pattern. In the second step, the LDA discrimination models were performed on the remaining two groups. For the Luodian−Dahua group, the accuracy of the original classification and LOOCV were 97.9% and 85.4%, which indicated REE combined with LDA could effectively identify Luodian nephrite and Dahua nephrite. For the Xinjiang−Qinghai−Russia group, the accuracy of the original classification and LOOCV was 74.1% and 63.9%, respectively. Overall, this work proves that a combination of REE analysis and chemometrics has a certain feasibility and broad application prospects for geographical origin, and the same methodology can be applied to study the origin of other gem materials. |
| first_indexed | 2024-03-09T18:49:25Z |
| format | Article |
| id | doaj.art-e496ae461d554f4d854b970bbdf7bbb0 |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-09T18:49:25Z |
| publishDate | 2022-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-e496ae461d554f4d854b970bbdf7bbb02023-11-24T05:58:46ZengMDPI AGMinerals2075-163X2022-10-011211139910.3390/min12111399Combining Rare Earth Element Analysis and Chemometric Method to Determine the Geographical Origin of NephriteYue Su0Mingxing Yang1Gemmological Institute, China University of Geosciences, Wuhan 430074, ChinaGemmological Institute, China University of Geosciences, Wuhan 430074, ChinaNephrite is a high-valued gem material, whose geographical origin determination is a topic of interest to both consumers and producers since the geographic origin determines its price and reputation. In the present study, we suggest a two-step method for discriminating geographical origins of nephrite based on the rare earth element (REE) contents combined with chemometrics. In the first step, the REE contents of nephrite samples were determined by laser ablation-inductively coupled plasma mass spectrometry (LA-ICP-MS), combined with previously reported data—the chondrite-normalized REE distribution pattern; the REE parameters of nephrite samples from six origins, namely Xinjiang, Qinghai, Russia, Guangxi, Guizhou, and Liaoning were then compared. In the second step, origin discriminant models were established by linear discriminant analysis (LDA), and the accuracy of the model was evaluated by leave-one-out cross-validation (LOOCV). The results showed that the REE contents were significantly different among the six nephrite origins with regional characteristics, which makes it possible to trace the origin. Using chondrite-normalized REE distribution patterns, the six nephrite origins can be divided into three separate groups: Xinjiang−Qinghai−Russia, Luodian−Dahua, and Xiuyan. Xiuyan nephrite can be directly distinguished from the other origins due to its unique REE distribution pattern. In the second step, the LDA discrimination models were performed on the remaining two groups. For the Luodian−Dahua group, the accuracy of the original classification and LOOCV were 97.9% and 85.4%, which indicated REE combined with LDA could effectively identify Luodian nephrite and Dahua nephrite. For the Xinjiang−Qinghai−Russia group, the accuracy of the original classification and LOOCV was 74.1% and 63.9%, respectively. Overall, this work proves that a combination of REE analysis and chemometrics has a certain feasibility and broad application prospects for geographical origin, and the same methodology can be applied to study the origin of other gem materials.https://www.mdpi.com/2075-163X/12/11/1399nephriterare earth elementlaser ablation-inductively coupled plasma mass spectrometrylinear discriminant analysisorigin determination |
| spellingShingle | Yue Su Mingxing Yang Combining Rare Earth Element Analysis and Chemometric Method to Determine the Geographical Origin of Nephrite Minerals nephrite rare earth element laser ablation-inductively coupled plasma mass spectrometry linear discriminant analysis origin determination |
| title | Combining Rare Earth Element Analysis and Chemometric Method to Determine the Geographical Origin of Nephrite |
| title_full | Combining Rare Earth Element Analysis and Chemometric Method to Determine the Geographical Origin of Nephrite |
| title_fullStr | Combining Rare Earth Element Analysis and Chemometric Method to Determine the Geographical Origin of Nephrite |
| title_full_unstemmed | Combining Rare Earth Element Analysis and Chemometric Method to Determine the Geographical Origin of Nephrite |
| title_short | Combining Rare Earth Element Analysis and Chemometric Method to Determine the Geographical Origin of Nephrite |
| title_sort | combining rare earth element analysis and chemometric method to determine the geographical origin of nephrite |
| topic | nephrite rare earth element laser ablation-inductively coupled plasma mass spectrometry linear discriminant analysis origin determination |
| url | https://www.mdpi.com/2075-163X/12/11/1399 |
| work_keys_str_mv | AT yuesu combiningrareearthelementanalysisandchemometricmethodtodeterminethegeographicaloriginofnephrite AT mingxingyang combiningrareearthelementanalysisandchemometricmethodtodeterminethegeographicaloriginofnephrite |