缝管原子捕集法中的原子化机理  

Mechanisms of Atomization in Slotted Tube Atom- Trapping Atomic Absorption Spectrometry

作　　者：杨海燕[1] 黄淦泉[1] 钱沙华[1] 

机构地区：[1]武汉大学环境科学系,武汉430072

出　　处：《分析化学》1997年第2期185-188,共4页Chinese Journal of Analytical Chemistry

基　　金：湖北省自然科学基金

摘　　要：本文用X射线衍射分析法研究了11个元素在开缝石英管中原子捕集与释放机理。Ag和 Bi以金属形式被捕集，而 Cd、Cu、In、Ni、Sb、Zn、Pb、Co、Ga则以氧化物或硅酸盐形式捕集．这些元素在释放时直接从熔融物蒸发原子化。5％乙醇或丙酮能提高大多数元素的灵敏度。大多数元素在Al2o3涂层管上的灵敏度较高，在La2O3涂层管上的检出限较低，精密度较高。The mechanisms of collection and release of eleven elements in atom-trapping atomic absorption spectrometry with slotted quartz tube in air-acetylene flame are investigat- ed by X ray diffraction analysis. Ag and Bi appear to be accumulated as metals whilst Cd, Cu, In, Ni, Sb, Zn, Pb, Co and Ga are trapped as oxides or silicates. The elements are re- leased by vaporization from the melt. A 5% ethanol or acetone improve the determination sensitivity of most elements. Most elements have higher precision and lower detection limit in La2O3-coated tube and higher sensitivity in Al2O3-coated tube.

关 键 词：原子吸收光谱法 原子化机理 缝管原子捕集法 

分 类 号：O657.31[理学—分析化学]