Sorption of Uranium(VI) and Thorium(IV) by Jordanian Bentonite

Table 11

Desorption of U(VI) and Th(IV) ions from bentonite.

	Eluting agent
% Recovery	1.0 M		0.5 M		0.1 M		0.01 M
	HNO3		HNO3		HNO3		HNO3
	U(VI)/Th(IV)		U(VI)/Th(IV)		U(VI)/Th(IV)		U(VI)/Th(IV)
First portion	4.793	12.651	3.925	9.072	3.141	7.180	2.439	10.257
Second portion	4.410	9.156	3.801	9.010	2.781	6.743	2.227	9.837
Third portion	4.406	9.125	3.208	8.789	2.675	6.403	2.215	6.282
Fourth portion	3.856	7.524	3.164	8.589	2.675	6.055	2.162	5.316
Fifth portion	3.845	6.527	2.661	8.544	2.663	4.819	2.161	2.283
Sixth portion	3.836	6.251	2.573	4.636	2.663	4.484	1.623	2.277
Seventh portion	3.695	6.141	2.549	3.430	2.593	3.878	1.576	2.272
Eighth portion	3.559	5.872	1.996	3.353	2.546	3.464	1.270	2.219
Ninth portion	3.535	5.861	1.994	2.638	1.993	2.645	0.853	2.005
Tenth Portion	2.971	5.827	1.773	2.007	1.748	2.557	0.829	1.950
% Cumulative recovery	38.905	69.109	27.594	60.069	25.479	48.227	17.354	44.699