| Professional Committee of Rock and Mineral Testing Technology of the Geological Society of China, National Geological Experiment and Testing Center | Host |
| Citation: |
QI Jinjie, YU Hongxia, XU Qinghong, YUAN Yonghai, YANG Feng, ZHANG Huiping. Optimization of Pretreatment Method for Tl Isotope Analysis of Geological Samples[J]. Rock and Mineral Analysis, 2024, 43(2): 213-223. doi: 10.15898/j.ykcs.202311070174
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Optimization of Pretreatment Method for Tl Isotope Analysis of Geological Samples
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Abstract
The thallium (Tl) isotope system can be utilized to track various geological processes, but the current sample digestion and ion exchange methods used for Tl isotope analysis take a long time. To improve the efficiency of chemical pretreatment of samples for Tl isotope analysis, the samples were decomposed by the microwave digestion method. In the mixed acid system of 2mL HNO3, 2mL HF and 0.5mL HClO4, 0.2g of GBW07406 could be completely dissolved by selecting the digestion procedure. The slurry was then loaded on AG1-X8 resin, followed by eluting with 2mL 2mol/L HNO3-1% Br2 for 6 times, 2mL H2O for 1 time, and 2mL 0.1mol/L HCl-6% SO2 for 5 times (Tl collection). The amount of Fe3+ and Al3+ allowed in the sample solution should not exceed 2.56mmol and 4.90mmol respectively, otherwise the recovery rate of Tl will be reduced. Measurement ε205Tl values for four geological reference materials (NOD-P-1, NOD-A-1, GBW07406 and GSP-2) by multi-collector inductively coupled plasma-mass spectrometry (MC-ICP-MS) showed a good precision (2SD better than 0.3, n=6) and a fixed difference of 0.8 compared with the value in the literature, indicating that the ε205Tl value of GSB04-1758-2004 with respect to NIST 997 should be approximately equal to 0.8. The BRIEF REPORT is available for this paper at
http://www.ykcs.ac.cn/en/article/doi/10.15898/j.ykcs.202311070174 . -
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References
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QI Jinjie, YU Hongxia, XU Qinghong, YUAN Yonghai, YANG Feng, ZHANG Huiping. Optimization of Pretreatment Method for Tl Isotope Analysis of Geological Samples[J]. Rock and Mineral Analysis, 2024, 43(2): 213-223. doi: 10.15898/j.ykcs.202311070174
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Figure 1.
Elution curves of Tl (AG1-X8 resin, 100-200 mesh), 2mol/L HNO3-1% Br2 for eluting matrix elments, ultrapure water for eluting NO3− and BrO−, 0.1mol/L HCl-6% SO2 for collecting Tl.
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Figure 2.
Influences of the load of Fe2O3, CaO and Al2O3 on the recovery of Tl (n=3)
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Figure 3.
The reproducibility of analytical results for Tl standard solution GSB 04-1758-2004 (n=40)