Röntgenfluoreszenzspektrometrische Bestimmung von Spurenelementen in verdünnten wäßrigen Lösungen nach Anreicherung auf Cellulose‐Ionenaustauschern

Determination of trace elements in dilute aqueous solutions by X‐ray fluorescence spectrometry after preconcentration on cellulose ion exchangers Different methods dealing with the X‐ray fluorescence analysis of solutions are reviewed. Cellulose ion exchangers were found to be a medium for the preconcentration of traces of elements in aqueous solutions. The enrichment is carried out by filtering 11 water containing μg‐amounts of different ions through a column. After drying, the cellulose ion exchangers are pressed into pellets and analysed by X‐ray fluorescence. For the collection step strong acid SE‐ (sulfoethyl‐) cellulose and strong basic DEAE‐(diethylaminoethyl‐) cellulose are used having an exchange capacity of 0,2 meq./gram and 0.85 meq./gram, respectively. The accuray of the method is about ± 10%. Detection limits (theoretical values) are in the range of 1–5 μg. Variations of the method referring to preparation of pellets, sensitivity and column dimensions are discussed.