For the past 20 years, LA-ICP-MS has been the method of choice to quantify element concentrations in fluid inclusions hosted in geological samples. However, the ablation of fluid inclusions typically produces short, transient signals that are difficult to representatively sample with sequential analysis inherent to single collector ICP-MS instruments, especially considering small inclusions (<20 µm) and/or low-concentration elements (<10 µg g⁻¹). This issue can be overcome by significantly reducing quadrupole settling times, allowing faster cycling through a given element list at constant duty cycle and therefore, better temporal resolution of the signal. In this note, we present results from already well-characterized fluid inclusion assemblages performed with a “fast-scanning” quadrupole ICP-MS, i.e. characterized by extremely short settling times (default 0.2 ms and down to 0.065 ms). This capability, which does not impede basic instrument performance, improves the results of LA-ICP-MS fluid inclusion analyses in three ways. First, it extends the possibility to accurately and reproducibly quantify element concentrations to fluid inclusions down to <10 µm in size, with absolute detection limits in the same range as using a conventional quadrupole. Second, it releases the need to compromise between full chemical characterization of the fluids and accurate determination of some key elements of interest, as short settling times offer the possibility to rapidly scan through extensive element lists (e.g. 52 elements cycled in 52 ms at 80% duty cycle in the tests presented here). Third, it improves accuracy and precision for analytes hosted in small daughter crystals in assemblages of complex, polyphase fluid inclusions.

中文翻译：

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用于流体包裹体 LA-ICP-MS 分析的快速扫描四极杆的优势

在过去的 20 年中，LA-ICP-MS 一直是量化地质样品中流体包裹体中元素浓度的首选方法。然而，流体包裹体的消融通常会产生短暂的瞬态信号，这些信号很难通过单收集器 ICP-MS 仪器固有的顺序分析进行代表性采样，特别是考虑到小包裹体 (<20 µm) 和/或低浓度元素 (<10 µg g ^-1 )。这个问题可以通过显着减少四极杆稳定时间来克服，允许在恒定占空比下更快地循环通过给定的元素列表，因此信号的时间分辨率更好。在本说明中，我们展示了使用“快速扫描”四极杆 ICP-MS 进行的已充分表征的流体包裹体组合的结果，即稳定时间极短（默认为 0.2 毫秒，低至 0.065 毫秒）。这种功能不会影响基本仪器的性能，从三个方面改进了 LA-ICP-MS 流体包裹体分析的结果。首先，它扩展了精确且可重复地量化流体包裹体中元素浓度的可能性，其中流体包裹体的尺寸小于 10 µm，绝对检测限与使用传统四极杆的范围相同。其次，它消除了在流体的完整化学表征和某些关键元素的准确测定之间进行折衷的需要，因为较短的稳定时间提供了快速扫描大量元素列表（例如在此处介绍的测试中，52 个元件以 80% 的占空比在 52 ms 内循环。第三，它提高了复杂多相流体包裹体集合中小子晶体中分析物的准确度和精密度。