Precise measurement of Sr isotopic composition of liquid and solid base using (LP)MC ICPMS
Precise measurement of Sr isotopic composition of liquid and solid base using (LP)MC ICPMS
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发表时间：
2002
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通讯作者：
W. Gang
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作者：
W. Gang
多收集器电感耦合等离子体质谱法（MC ICPMS）是近年来发展起来的一种强大的固体同位素测量工具，它可以精确测量Sr同位素组成，效率远高于热电离体质谱法（TIMS）。对于有Rb的样品，当Rb/Sr比小于0.001时，减去Rb的干扰即可得到可靠的87Sr/86Sr。但是，当Rb含量较高时，特别是Rb/Sr为0.01时，则需要进行额外的校准。通常，Rb/Sr比值与Δ87Sr/86Sr之间的经验线性回归，即实测87Sr/86Sr与真实比值的偏差，应事先根据一些标准Sr溶液试验建立。根据经验线性回归，可以得到真实的87Sr/86Sr比值。此外，该方法还可用于固体样品的激光烧蚀原位锶同位素组成测量。
Multi Collector Inductively Coupled Plasma Mass Spectrometry (MC ICPMS), a powerful tool for solid isotopic measurement developed in recent year, can precisely measure Sr isotopic composition with much higher efficiency than Thermal Ionization Mass Spectrometry (TIMS). As for the sample with Rb, the creditable 87Sr/86Sr can be obtained by subtracting the interference of Rb when Rb/Sr ratios are less than 0.001. However, when the Rb content is high, especially when Rb/Sr 0.01, an extra calibration should be made. Usually an empirical linear regression between Rb/Sr ratios and Δ87Sr/86Sr, the deviation of the measured 87Sr/86Sr from its true ratio, should be established before hand based on some standard Sr solution test. According to the empirical linear regression, the true 87Sr/86Sr ratios are available. Furthermore, such calibration could help the in situ measurement of Sr isotopic compositions for the solid samples by laser ablation.