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本文应用热力学和动力学相结合的方法研究了石墨炉原子吸收法中As、sb、se、Te的原子化机理。应用作者早先提出的公式 k=kd×(At/(A_(max)-At))计算温度下的原子形成常数k,绘制Arrhenius图。通过直线斜率得到的原子化活化能来确定各元素的原子化过程。实验表明,As和se是以固态金属进行原子化,而Sb则与介质有关,在盐酸介质中以气相氯化物解离原子化:在硝酸介质中以双原子分子原子化。Te与Sb类似,且与灰化温度有关。
In this paper, the atomization mechanism of As, Sb, Se and Te in graphite furnace atomic absorption spectrometry was studied by the combination of thermodynamics and kinetics. The atomic formation constant k at temperature is calculated using the formula proposed earlier by the author k = kd × (At / (A_ (max) -At)) to draw an Arrhenius plot. The atomization activation energy of each element is determined by the activation energy of the atom obtained from the slope of the straight line. The experiments show that As and Se are atomized by solid metal, while Sb is related to the medium. Dissolved and dissociated by vapor phase chloride in hydrochloric acid medium: atomized by diatomic molecules in nitric acid medium. Te is similar to Sb and related to ashing temperature.