Anwendung von ionenaustauschverfahren zur bestimmung von spurenelementen in natürlichen wässern—IV: Uran,kobalt und kadmium

A method is described for separating and determining. by spectrofluorimetric or spectrophotometric measurement, traces of uranium. cobalt and cadmium at ppM levels in natural waters. The sample is acidified with HCl. filtered. and after addition of ascorbic acid and potassium thiocyanate, passed through a column of Dowex 1.- × 8 anion-exchange resin in the thiocyanate form. The three ions are concentrated on the resin as thiocyanate complexes, being at the same time separated from most of the other ions present in the sample. Elution with a tetrahydrofuranmethylglycol-HCl mixture removes other interfering ions. then 6M HCl strips the cobalt. 1M HCl the uranium, and 2M HNO₃ the cadmium. Data are presented for concentrations of uranium (0·01–5 ppM) cobalt (0·04–1·9 ppM) and cadmium (0·04–0·6 ppM) in a large number of water sources in Austria.