Abstract
A semi-empirical method for improved trace multi-element determination in organic matrices based on 109Cd radioisotope energy-dispersive x-ray Nuorescence (EDXRF) spectrometry is presented. It involves optimizing the geometry and electronics, interpretation and transformation of the analytical performance indices to practical quanti‐cation, an approach to model the dark matrix, estimation of the background and scatter in order to enhance matrix correction and the systematic optimization of x-ray spectral data deconvolution using the AXIL‐ QXAS techniques. The objective was to establish an optimum procedure for routine multi-elemental determination of trace levels in organic matrices using radioisotope-excited EDXRF. Examples of analyses for some matrices of importance in toxicology, medicine and agriculture are presented, with results indicating that the radioisotope photon-excited EDXRF technique is very versatile for the analysis of light element matrices of the organic type. Background and scatter, and the dark matrix problem, can be modelled. 1998 John Wiley & Sons, Ltd.
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