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Determination of residual chloride content in ionic liquids using LA-ICP-MS

机译：使用La-ICP-MS测定离子液体中的残留氯含量

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Nowadays, ionic liquids (ILs) are used in a wide range of applications. Their exceptional chemical and physical properties, sustainability of use and the possibility of easy recycling are attractive aspects promoting the acceptance of ILs also for commercial applications. While synthesis is in most cases simple and straightforward, purification of the reaction products might pose a number of problems. Due to the major influence of inorganic contaminations from the synthesis process, thorough monitoring of impurities is required. However, the unusual properties of ILs create some problems for conventional chemical analysis. In this work, a dried droplet approach with subsequent LA-ICP-MS sampling will be used for the analysis of chloride in ILs – a by-product from the synthesis procedure. Dried droplet application onto pre-cut filter paper disks allows the analysis of hydrophilic as well as hydrophobic ILs with calibration from dried aqueous standards for signal quantification. The approach is applied on two types of alkylimidazolium ILs, underlining the versatility of the sample preparation and measurement approach. Compared to commonly used analysis techniques for chloride in ILs, the presented approach is simple, fast, and does not require harmful reagents. Different internal standardization strategies were investigated during this study. With a reproducibility of below 2% relative standard deviation and limits of detection of 0.09 mg g ~(?1) for chloride in ILs, the presented approach was showed to be fit for the purpose of routine analyses and reaction monitoring. If necessary, the approach can be extended to other analytes of interest in the field of the synthetic chemistry of ILs.
机译：如今，离子液体（ILS）用于各种应用中。它们的特殊化学和物理性质，使用可持续性以及容易回收的可能性是促进ILS的接受，也适用于商业应用。虽然合成在大多数情况下简单且直接，但反应产物的纯化可能会造成许多问题。由于无机污染来自合成过程的主要影响，需要彻底监测杂质。然而，ILS的不寻常性质为常规化学分析产生了一些问题。在这项工作中，具有随后的LA-ICP-MS采样的干燥液滴方法将用于分析ILS中的氯化物 - 来自合成程序的副产物。将干燥的液滴应用到预切割滤纸上允许分析亲水性以及疏水性ILS，从干燥的干燥水溶液中校准信号量化。该方法适用于两种类型的烷基咪唑鎓ILS，下调样品制备和测量方法的多功能性。与IL中氯常用的分析技术相比，所提出的方法简单，快速，并且不需要有害试剂。在本研究期间调查了不同的内部标准化策略。在ILS中再现2％相对标准偏差和0.09mg g〜（β1）的检测限值，表明该方法适合于常规分析和反应监测。如有必要，该方法可以扩展到ILS合成化学领域的其他兴趣分析。

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