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

该项目属于分析和表面化学的一般领域，以及电感耦合等离子体光谱分析的子领域。这一实验项目的主旨是继续由国家科学基金会赠款CHE-8503090发起的研究，这些研究的重点是引入电感耦合等离子体原子发射光谱(电感耦合等离子体原子发射光谱)和电感耦合等离子体质谱仪(电感耦合等离子体质谱仪)的样品。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，以及分析物和溶剂向等离子体传输的质量传输值。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，这些机制似乎对重要的等离子体性质产生重要影响，如电离温度和电子密度。作为这项研究的一部分，将根据激光夫琅和费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)界面作为将去溶分析物引入大气压和低压射频放电的方法，并将研究这些界面的基本空气动力学、粒子动力学和传输方面。该低压界面将与一种新型的低压电感耦合等离子体发射光谱仪和电感耦合等离子体质谱联用。这项研究集中在基于电感耦合等离子体的分析中的历史薄弱环节(样品引入)，为分析能力强大的电感耦合等离子体光谱分析技术的更广泛应用打开了大门，并应能够开发可供私营部门仪器制造商利用的新技术。

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.