摘要
本文应用x-射线衍射(XRD)、X-射线光电子能谱(XPS)、俄歇电子能谱(AES)、扫描电子显微技术(SEM)研究了钼酸铵在石墨炉内石墨探针表面上的原子化机理。实验结果表明,在温度<1350K时,钼酸铵经历MoO_3和Mo_4O_(11)中间产物转变为MoO_2(s)。在更高温度下,MoO_2(s)首先还原为Mo_2C,而后进一步转变为MoC(s)。MoC再分解为Mo(s)。钼的原子化起源于Mo的升华。
A study has been made of the atomization mechanism of ammonium molybdate from the graphite probe surface in the graphite furnace during pretreatment by Xray diffroction spectrometry, X-ray photoelectron spectrometry, Auger electrospectrometry and scanning electron micrography. It is shown that at temperature below 1350K ammonium molybdate decomposes into MoO_2(s) through the intermediates MoO_3(s) and Mo_4O_(11)(s). At higher temperature, MoO_2(s) changes first into Mo(s) and then to Mo_2C(s),MoO_2(s) being reduced directly into Mo_2C(s) by carbon is also a possible reaction. The formation of Mo(s) takes two steps: Mo_2C(s) is first reduced by carbon to MoC(s) and MoC(s) decomposes to Mo(s). Gaseous Atoms of molybdenum originate from the sublimation of Mo(s).
出处
《分析试验室》
CAS
CSCD
北大核心
1993年第2期29-33,共5页
Chinese Journal of Analysis Laboratory
基金
国家自然科学基金
关键词
石墨炉
原子吸收光谱法
钼
原子化
Molybdenum atomization mechanism
graphite probe
graphite furnace atomic absorption spectrometry
