RESIDUAL MATRIX IN X-RAY SPECTROMETRY

The usual functions for the matrix correction presume that the concentrations of all matrix elements are known. But in practice one has frequently to deal with samples which contain an unknown residual matrix. If the concentrations of the matrix elements are used to carry out the correction the influence of this residual matrix can be governed by introducing a quadratic term of the analyte's intensity into the correcting function. It is also possible to use the intensities of the matrix elements as starting-point of the matrix correction. In this case one can introduce the intensity of a suitable chosen scattered radiation into the correcting function in order to correct for the residual matrix. The theoretical foundations of these procedures are discussed. © 1979 Springer-Verlag.