High-quality Sr isotope data are critically dependent on the quality of reference materials that are used for instrumental calibration and data monitoring during LA-MC-ICP-MS analysis.Two natural apatite samples (SL-7 and SM139-1) were investigated here to test their suitability as in-situ Sr isotopic analysis reference materials.Major and trace element analyses by EPMA and LA-ICP-MS showed that apatites were all characterized by high Cl (1.80~2.46wt%), high Sr contents (> 3752 μg g -1 ) and extremely low Rb/Sr ratios.A total of 120 and 126 LA-MC-ICP-MS analyses for SL-7 and SM139-1 apatite showed consistent and homogeneous Sr isotopic compositions with average 87 Sr/ 86 Sr ratio of 0.70521 ± 0.00016 (2SD, n = 120) and 0.70509 ± 0.00015 (2SD, n = 126), respectively, which were in good agreement with solutionbased data determined by TIMS or SN-MC-ICP-MS (0.705219 ± 0.000019 (2SD, n = 13) and 0.705114 ± 0.000041 (2SD, n = 13), respectively), suggesting that SL-7 and SM139-1 apatites can be used as potential reference materials for microbeam Sr isotopic analysis.
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Jing Wang (2024) studied this question.
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