Correlations in spectra of low and high voltage spark discharges, and a.c. and d.c. arcs are investigated.
Firstly, conditions were determined, under which correlation relationships between the analytical signal and the parameters following variations in the excitation and mass transfer processes are rectilinear, strong (correlation coefficients r 0.8), and stable in time and under which the regression coefficients do not depend on the investigated element concentration.
A quantitative spectral analysis method, in which either one “fixation pair”, controlling mass transfer changes in the radiation source, or two fixation pairs, following variations in the excitation and mass transfer conditions, are registered simultaneously with the analytical signal, was elaborated. Applications of the method in arc analysis of soils and ores and spark analysis of steels illustrate the improvement of both analytical precision and accuracy. 相似文献