Quantification of trace element contents in frozen fluid inclusions by UV-fs-LA-ICP-MS analysis
Quantification of trace element contents in frozen fluid inclusions by UV-fs-LA-ICP-MS analysis
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DOI：
10.1039/c4ja00015c
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发表时间：
2014-05
影响因子：
3.4
通讯作者：
M. Albrecht;I. Derrey;I. Horn;S. Schuth;S. Weyer
中科院分区：
文献类型：
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作者：
M. Albrecht;I. Derrey;I. Horn;S. Schuth;S. Weyer
我们开发了一种新的分析装置，用于UV-fs-LA-ICP-MS测定流体包裹体中的微量元素浓度。用这种方法可以成功地分析55个石英中的冷冻合成NaCl-H_2 O流体包裹体中的53个，其尺寸范围从8 μm到25 μm到50 μm。由于194 nm UV-fs激光可以很好地控制冷冻流体包裹体的打开过程，因此可以实现高成功率。微量元素分析采用快速扫描扇形磁场ICP-MS进行。流体包裹体分析的检测下限从0.1 μg g−1（209 Bi）到10 μg g−1（39 K）不等。典型的分析不确定性，取决于元素和各自的浓度水平，范围在10%和30%（1 RSD）之间，基于实验合成的流体包裹体的再现性。在HP/HT实验中表现为惰性的储备溶液中的所有元素（B、K、Cd、Te、Tl、Pb和Bi）都可以在合成包裹体中回收，其浓度在其特定的分析不确定度范围内对应于其原始浓度53 μg g−1。该方法代表了一种高效的工具，用于确定小流体包裹体中低浓度水平的准确微量元素数据，成功率高达90%以上。考虑到流体包裹体通常耗时的表征，后者特别有利。
We have developed a new analytical setup for the determination of trace element concentrations in fluid inclusions by UV-fs-LA-ICP-MS. Laser ablation was performed at a low temperature of −40 °C by using a modified heating–freezing stage as the ablation cell. With this method it was possible to successfully analyse 53 of 55 frozen synthetic NaCl–H2O fluid inclusions in quartz, covering a size range between 8 μm and 25 μm down to a depth of 50 μm. The high success rate could be achieved as the 194 nm UV-fs-laser allows excellent control over the opening procedure of frozen fluid inclusions. Trace element analyses were performed with a fast scanning magnetic sector field ICP-MS. The lower limits of detection for fluid inclusion analysis vary from 0.1 μg g−1 (for 209Bi) to 10 μg g−1 (for 39K). The typical analytical uncertainty, depending on the element and respective concentration level, ranges between 10% and 30% (1RSD), based on the reproducibility of experimentally synthesized fluid inclusions. All elements from a stock solution, which behaved inert during the HP/HT experiments (B, K, Cd, Te, Tl, Pb and Bi), could be recovered in the synthetic inclusions at concentrations that correspond within their specific analytical uncertainties to their original concentration of 53 μg g−1. The method represents a highly efficient tool for the determination of accurate trace element data on low concentration levels in small fluid inclusions with a high success rate of >90%. The latter is particularly advantageous considering the commonly time consuming characterization of fluid inclusions.