Injection of material from a two-component sample into an electrical discharge plasma

A mathematical model is proposed for the process of injection of material from a two-component sample of limited weight into a discharge plasma in atomic emission spectral analysis. An analytical expression is obtained for the time dependence of the intensity of the spectral line for the element associated with a small impurity. It is shown that based on the ratio of the volatility factors for the impurity material and the matrix, three groups of analyte elements can be isolated with similar injection behavior. Comparison of the theoretical and experimental results shows their qualitative agreement.