2. ENVIRONMENTAL ChEMISTRy & TEChNOLOGy 2.1. Lectures
2. ENVIRONMENTAL ChEMISTRy & TEChNOLOGy 2.1. Lectures
2. ENVIRONMENTAL ChEMISTRy & TEChNOLOGy 2.1. Lectures
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Chem. Listy, 102, s265–s1311 (2008) Environmental Chemistry & Technology<br />
Table III<br />
The recovery with different eluents<br />
Elution reagent Recovery of U [%] a<br />
Ethanol-HnO 3 [1 mol dm –3 ] 92 ± 5<br />
Aceton-HnO 3 [1 mol dm –3 ] 100 ± 3<br />
Methanol-HnO 3 [1 mol dm –3 ] 94 ± 2<br />
a eluted with 10 ml of eluent in triplicate<br />
5 × 10 –3 mol dm –3 Septonex solution. The sample solution<br />
containing 1.5–15 mg dm –3 U with 6 × 10 -5 mol dm –3 of PAR<br />
was applied on the column with 1 ml min –1 . The column<br />
was then washed with 15 ml of distilled water and uranium<br />
eluted with a mixture of acetone : 1 mol dm –3 HnO 3 (1 : 1) .<br />
The organic solvent was removed by evaporation under an IR<br />
lamp to 2 ml in a suitable Teflon ® dish. The residue was then<br />
diluted to 10 ml by distilled water and analyzed by ICP-AES.<br />
(cf. Table IV)<br />
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s434<br />
Table IV<br />
The efficiency for uranium (VI) in the presence of org. reagent<br />
at pH 9 on Amberlite XAD 4<br />
Org. reagent Uranium (VI)<br />
1.5 mg dm –3 3 mg dm –3 15 mg dm –3<br />
PAR a 1.53 ± 0.02 <strong>2.</strong>99 ± 0.05 14.75 ± 0.12<br />
APDC b 1.65 ± 0.09 3.05 ± 0.05 15.69 ± 0.15<br />
APDC c 1.43 ± 0.07 3.01 ± 0.05 14.48 ± 0.69<br />
a 6 × 10 –5 mol dm –3 PAR,<br />
b 9 × 10 –5 mol dm –3 APDC,<br />
c 1.8 × 10 –4 mol dm –3 APDC,<br />
d The sorbent conditioned with 5 × 10 –3 mol dm –3 Septonex<br />
and the sorption carried out in triplicate<br />
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