【摘要】 本文研究了石墨炉原子吸收分析中管壁、平台和探针原子化测量Cd、Pb、Mn、Co、Cu和Cr的吸收信号特征。结果表明,吸收信号形状由被测元素的性质、样品气化速率和原子蒸气扩散速率决定。对于同一元素,在选定仪器条件下,峰形主要由样品气化速率决定。而样品气化速率又与原子化表面的升温速率有关。三种原子化方法中,探针的升温速率最快,得到较窄的信号峰,平台的升温速率最慢,峰形较宽。在提高样品气化速率方面,探针原子化是最理想的方法。更多还原

【Abstract】 Characteristics of absorption signal of Cd, Pb, Mn, Co, Cu and Cr in GFAAS were investigated for tube wall, platform and probe atomization. It was found that the shape of absorption signal was controlled by the property of the analyte, the sample vaporization rate and the gas diffusion rate. Under the same instrument condition the peak shape was dependent mainly on the sample vaporization rate which was related to the heating rate of atomization surface. The heating rate of probe was the fastest so that more narrow signal peaks were obtained while that of the platform was the slowest and the signal shapes were poor. The probe atomization technique was considered to be the best.更多还原