Electrothermal Atomization and Surface Chemistry

电热雾化和表面化学

• 批准号: 9020591
• 负责人: James Holcombe
• 金额: $ 43.38万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-12-01 至 1994-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9020591&HistoricalAwards=false
• 关键词: Electrothermal; Atomization; Surface; Chemistry

In this project in the Analytical and Surface Chemistry Program of the Chemistry Division, Prof. Holcombe will use graphite furnaces to study means of improving trace metals analysis, and also to study gas/solid interactions. Graphite furnace methods are already among the most sensitive available for detecting trace metals in biological and environmental systems, and Holcombe's work will improve the reliability and generality of the approach. Theoretical calculations will aid in understanding the chemical and physical processes occurring. Among the novel features of the research, Holcombe will use temperature-programmed static secondary ionization mass spectrometry to characterize the furnace surface as first solvent, then the analytical species are vaporized. Spectral interpretation and collection of basic surface kinetics data will be emphasized. Monte Carlo calculations of gaseous dynamics will be carried out on a supercomputer to couple the fundamental data to predictions of analytical signal behavior. If successful, inexpensive methods for ultratrace quantification will be at hand, which will compete in performance with the much more expensive plasma/mass spectrometric techniques now in use.

在化学系分析和表面化学计划的这个项目中，Holcombe教授将使用石墨炉来研究改进痕量金属分析的方法，并研究气体/固体相互作用。石墨炉方法已经是检测生物和环境系统中痕量金属的最灵敏的方法之一，霍尔科姆的工作将提高该方法的可靠性和通用性。理论计算将有助于理解发生的化学和物理过程。在这项研究的新特征中，Holcombe将使用程序升温静态二次电离质谱仪来表征炉子表面作为第一溶剂，然后蒸发分析物种。将强调对基本表面动力学数据的光谱解释和收集。气体动力学的蒙特卡罗计算将在一台超级计算机上进行，以将基本数据与分析信号行为的预测结合起来。如果成功，超微量定量的廉价方法将近在咫尺，这将在性能上与目前使用的昂贵得多的等离子体/质谱学技术竞争。