Determination of beryllium by using X-ray fluorescence spectrometry

摘要

X-ray fluorescence spectrometry method is subject to certain difficulties and inconveniences for the elements having the atomic number 9 or less. These difficulties become progressively more severe as the atomic number decreases, and are quite serious for beryllium, which is practically indeterminable directly by XRF. Therefore, an indirect determination of beryllium that is based on the evaluation of cobalt in the precipitate is taken into consideration. In the thesis below, there is a description of a new, simple, and precise method by selective precipitation using hexamminecobalt(III) chloride and ammonium carbonate - EDTA solution as a complexing agent for the determining of a trace amount of beryllium using X-ray fluorescence spectrometry. The optimum conditions for [Co(NH3)(6)][Be-2(OH)(3)(CO3)(2)(H2O)(2)]center dot 3H(2)O complex formation were studied. The complex was collected on the membrane filter, and the Co K alpha fine was measured by XRF. The method presents the advantages of the sample preparation and the elimination of the matrix effects due to the thin film. obtained. The detection limit of the proposed method is 0.2 mg of beryllium. The method was successfully applied to beryllium determination in copper/beryllium/cobaft alloys.