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A viscous film sample chamber for Laser Ablation Inductively Coupled Plasma – Mass Spectrometry
Talanta ( IF 6.1 ) Pub Date : 2017-10-31 , DOI: 10.1016/j.talanta.2017.10.060
Damiano Monticelli , Davide Civati , Barbara Giussani , Carlo Dossi , Davide Spanu , Sandro Recchia

Laser Ablation - Inductively Coupled Plasma - Mass Spectrometry (LA-ICP-MS) is a powerful method to determine the elemental composition of solid-state samples as it combines the high sensitivity and isotope selectivity of ICP-MS detection and the simplicity of laser ablation sampling. This technique enables rapid multiple sampling of the analysed material, such as needed for mapping or in-depth profiling applications. However, the duration of these measurements is practically restricted by the time taken for the particle to be transported from the sampling point to the ICP torch. The ablation cell, i.e. the sample holder, should combine high removal rate, high efficiency (i.e. complete transport of the ablated material) and reduced memory effects. These goals may be achieved by carefully designing the geometry of the cell and its gas flow patterns. A new cell design which enables a homogeneous wahout time of around 210 ms from a cylindrical chamber with 70 mm diameter is introduced in this paper. Washout time was determined as the time for the transient signal of 238U from a NIST610 glass standard to fall to 10% of its peak value. This result is achieved by combining a diffused, cylindrical flow pattern with an extraction tube coaxial with the laser beam and fixed to the laser assembly which enables the sampling point to be constantly positioned on the ablation spot. The lower part of the cell is mounted on the x,y stage for sample movement: the cell sealing is warranted by a viscous film junction between the lower and upper cell parts. Optimisation and performances of the apparatus are discussed in detail and performances are compared to existing designs.



中文翻译:

用于激光烧蚀电感耦合等离子体质谱的粘性膜样品室

激光烧蚀-电感耦合等离子体质谱(LA-ICP-MS)是一种测定固态样品元素组成的强大方法,因为它结合了ICP-MS检测的高灵敏度和同位素选择性以及激光烧蚀的简便性采样。这项技术可以对被分析的材料进行快速的多重采样,例如作图或深度剖析应用程序所需要的。但是,这些测量的持续时间实际上受颗粒从采样点传输到ICP炬的时间限制。消融池(即样品架)应兼具高去除率,高效率(即消融材料的完全运输)和降低的记忆效应。通过仔细设计电池的几何形状及其气流模式,可以实现这些目标。本文介绍了一种新的电池设计,该设计可从直径为70 mm的圆柱形腔室中获得约210 ms的均匀振荡时间。将洗脱时间确定为NIST610玻璃标准品产生的238U瞬态信号下降到其峰值的10%所需的时间。通过将扩散的圆柱形流动模式与与激光束同轴并固定在激光器组件上的提取管结合在一起,可以实现此结果,该提取管使采样点始终位于消融点上。样品池的下部安装在x,y载物台上,用于样品移动:样品池下部和上部之间的粘性薄膜接合确保了样品池密封。详细讨论了设备的优化和性能,并将性能与现有设计进行了比较。

更新日期:2017-10-31
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