Loading curves, rate of exchange and distribution coefficients of Duolite ES 346 are determined for U q + , C 3 + and F$+ , using simulated sea water. The crude resin gives off ammonia into solution which leads to precipitation of uranyl ions and high apparent distribution coefficients. With the purified resin the following distribution coefficients are measured at pH 8.1: & ( U a + ) = &(Cd+) = &(F2+) = 0.6 * 10' ml/g. This leads to a loading of the resin in sea water of pH 8.1 with uranium only to about 20 pg per g of resin. ZUSAMMENFASSUNG: Die Beladungskurven, die Austauschgeschwindigkeit und die Verteilungskoeffizienten von Duolit ES 346 wurden unter Verwendung von simuliertem Meerwasser fur U@+ , C d + und Ft?+ bestimmt. Das rohe Harz gibt Ammoniak in die Losung ab, was zur Ausfdlung von Uranylionen und scheinbar hohen Verteilungskoeffizienten fuhrt. Fur das gereinigte Harz wurden die folgenden Verteilungskoeffizienten bei pH 8,l gemessen: &(U@+) = K.,(Cd+) = &(Ft?+) = 0,6 * lU' ml/g. Dies fuhrt zu einer Beladung des Harzes in Meerwasser vom pH 8,l mit Uran bis etwa 20 pg pro g Harz.* Assuming that nitrogen is present only in form of amidoxime groups. * Atomic emission spectrometry by use of inductive coupled plasma.
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