Sample Introduction for Inductively Coupled Plasma Atomic Emission Spectrometry and Inductively Coupled Plasma Mass Spectrometry

这个项目是在一般领域的分析和表面化学和子领域的电感耦合等离子体（ICP）光谱学。该实验项目的重点是继续在美国国家科学基金会（NSF）资助CHE-8503090下启动的研究，重点是电感耦合等离子体原子发射光谱（ICP/AES）和电感耦合等离子体质谱（ICP/MS）的样品引入。将测量一些描述气溶胶产生、传输、蒸发和与等离子体相互作用的物理参数。这些参数包括气溶胶的液滴大小分布，以及分析物和溶剂输运到等离子体的质量输运值。这项工作的一个关键方面是研究溶剂、液体和蒸汽与等离子体相互作用的机制，这似乎对等离子体的重要性质，如电离温度和电子密度产生重大影响。作为本研究的一部分，将根据激光弗劳恩霍夫散射获得的实验数据，开发一个使用气动和其他雾化手段产生气溶胶的工作模型。将研究使用单分散气溶胶发生器（MAGIC）界面作为将脱溶分析物引入大气压和低压射频放电的手段，并研究这些界面的基本空气动力学、粒子动力学和输运方面。低压接口将耦合到一个新的低压ICP，用于ICP/AES和ICP/MS。这项研究的重点是基于ICP的分析中历史上的薄弱环节（样品引入），为分析功能强大的ICP光谱技术的更广泛应用打开了大门，并应使新技术的开发能够被私营部门仪器制造商利用。

This project is in the general area of analytical and surface chemistry and in the subfield of inductively coupled plasma (ICP) spectroscopy. The thrust of this experimental project continues studies initiated under NSF grant CHE-8503090 that focus on sample introduction for inductively coupled plasma atomic emission spectroscopy (ICP/AES) and inductively coupled plasma mass spectrometry (ICP/MS). A number of physical parameters which describe aerosol generation, transport, evaporation, and interactions with the plasma will be measured. These parameters include drop size distributions of aerosols, and mass transport values for analyte and solvent transport to the plasma. A key aspect of the work is an investigation of the mechanisms of solvent liquid and vapor interaction with the plasma, which appear to exert a major effect on important plasma properties, such as ionization temperature and electron density. As part of this research, a working model of aerosol generation, using pneumatic and other means of nebulization will be developed, based on experimental data obtained by laser Fraunhofer scattering. The use of a monodisperse aerosol generator (MAGIC) interface as a means of introducing desolvated analyte to both atmospheric pressure and low pressure radio frequency discharges will be investigated, and the fundamental aerodynamic, particle dynamic, and transport aspects of these interfaces will be studied. The low pressure interface will be coupled to a novel low-pressure ICP for use in both ICP/AES and ICP/MS. This research, which focusses on the historically weak link (sample introduction) in ICP-based analyses, opens the door to broader applications of analytically powerful ICP spectroscopic techniques and should enable the development of new technologies which could be capitalized upon by private sector instrument manufacturers.