Radiochemische Bestimmung von Plutonium in Urin bei Gegenwart von Komplexen Dekorporationsmitteln

The interfering effect of DTPA or EDTA on the coprecipitation of Pu from urine with Ca(Mg)-phosphate is cancelled nearly by adding an excess of Ni²⁺ (about 1.8 g/l) to the urine samples before precipitating. After subsequent extraction with Alamine-336 (10% in xylene), reextraction with 10N HCl/NH₄I, and electrodeposition on stainless steel, the recoveries of Pu are about 70% in comparison with 85% in absence of DTPA or EDTA.