ETV-ICP-AES联用技术的蒸发器研究

Study on Vaporizer for ETV-ICP-AES

ETV-ICP-AES是样品电热气化/电感耦合等离子体激发的联用技术,具有进样效率高并可进行微升级样品分析的特点.ETV-ICP-AES多采用石墨炉或石墨棒蒸发器.因此,蒸发器的结构、形状、升温速率以及温度分布等对分析信号有很大的影响.本文研究了蒸发器的接口、形状、结构的影响;自行设计了插入式平台,减小死体积,还研究了在载气单向连续流动的情况下,石墨炉内部温度的大致分布,讨论了平台蒸发和管壁蒸发.

A graphite furnace was employed as a vaporizer for sample introduction into a inductively coupled plasma(ETV-ICP-AES). The interface design, the effect of geometry and volume of the vaporizer including 'insert platform' were studied. And a piece of graphite rod was put from the end of the graphite tube to minimize 'dead volume', only allowing carrier gas passed through the arc tunnel between the tube and the rod. The temperature and its distribution inside the vaporizer were also explored. Finally, the platform vaporization and wall vaporization were discussed.