Here we present an analytical method for Zinc (Zn) isotopic measurements using “standard-sample bracketing” on a Nu Sapphire multi-collector inductively coupled plasma-mass spectrometer. The effects of Zn mass fraction and HNO₃ molarity mismatch between the standard and the sample, as well as the presence of matrix elements have been evaluated. Long-term reproducibility of better than ±0.03‰ for δ⁶⁶Zn (2s) was routinely obtained. Accurate measurements were achieved when C_Ni/C_Zn < 0.001, C_Ti/C_Zn < 0.03, C_Ba/C_Zn < 0.05, C_Na/C_Zn and C_Al/C_Zn < 0.5, C_Mg/C_Zn < 0.1, C_Fe/C_Zn < 5 and C_Cu/C_Zn as well as C_Cd/C_Zn < 10. High-precision Zn isotopic determination were performed on twenty-one widely available geological certified reference materials, with an overall range of ~ 0.62‰ (0.15 to 1.07‰), which is nearly twenty times the current analytical precision (0.03), and the results are in agreement with most previously published data within 2s. Among them, δ⁶⁶Zn_{JMC 3-0749L} of eleven geological certified reference materials are reported for the first time: 0.22 ± 0.03‰ (dolerite, DR-N), 0.23 ± 0.02‰ (gabbro, GSR-10), 0.20 ± 0.04‰ (microgabbro, PM-S), 0.15 ± 0.02‰ (andesite, GSR-2), 0.22 ± 0.08‰ (diorite, GSR-9), 0.19 ± 0.07‰ (syenite, GSR-7), 0.30 ± 0.06‰ (granite, GSR-1), 0.25 ± 0.00‰ (rhyolite, GSR-11), 0.37 ± 0.01‰ (shale, GSR-5), 0.21 ± 0.03‰ (limestone, GSR-6) and 0.20 ± 0.03‰ (hornblendite, GSR-15). The novel Zn isotopic data from these certified reference materials can be used for future interlaboratory comparisons.

中文翻译：

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使用 MC-ICP-MS 测量地质标准物质中的锌同位素


在这里，我们提出了一种在 Nu Sapphire 多接收器电感耦合等离子体质谱仪上使用“标准样品包围”进行锌 (Zn) 同位素测量的分析方法。对标准品和样品之间 Zn 质量分数和 HNO ₃ 摩尔浓度不匹配以及基质元素存在的影响进行了评估。 δ ⁶⁶ Zn (2s) 的长期重现性通常优于±0.03‰。当 C _Ni /C _Zn < 0.001、C _Ti /C _Zn < 0.03、C _Ba < 0.05，C _Na /C _Zn 和 C _Al /C _Zn < 0.5，C _Mg /C _Zn < 0.1，C _Fe /C _Zn < 5 和 C _Cu /C _Zn 以及 C _Cd /C _Zn < 10. 对 21 个广泛使用的地质认证参考进行高精度锌同位素测定总体范围约为0.62‰（0.15至1.07‰），是当前分析精度（0.03）的近20倍，并且结果在2秒内与大多数先前发布的数据一致。其中，11种地质有证标准物质的δ ⁶⁶ Zn _{JMC 3-0749L} 为首次报道：0.22±0.03‰（辉长岩，DR-N）、0.23±0.02‰（辉长岩） , GSR-10), 0.20 ± 0.04 ‰ (微辉长岩, PM-S), 0.15 ± 0.02 ‰ (安山岩, GSR-2), 0.22 ± 0.08 ‰ (闪长岩, GSR-9), 0.19 ± 0.07 ‰ (正长岩, GSR -7), 0.30 ± 0.06 ‰ (花岗岩, GSR-1), 0.25 ± 0.00 ‰ (流纹岩, GSR-11), 0.37 ± 0.01 ‰ (页岩, GSR-5), 0.21 ± 0.03 ‰ (石灰石, GSR-6) ）和 0.20 ± 0.03‰（角闪石，GSR-15）。这些经过认证的参考材料中的新锌同位素数据可用于未来的实验室间比较。