Journal
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
Volume 283, Issue 3, Pages 603-607Publisher
SPRINGER
DOI: 10.1007/s10967-009-0397-8
Keywords
p-tert-Butylcalix[8]arene; Preconcentration; Uranium(VI); Solid phase extraction
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This paper reports silica gel loaded with p-tert-butylcalix[8]arene as a new solid phase extractor for determination of trace level of uranium. Effective extraction conditions were optimized in column methods prior to determination by spectrophotometry using arsenazo(III). The results showed that U(VI) ions can be sorbed at pH 6 in a mini-column and quantitative recovery of U(VI) (> 95-98%) was achieved by stripping 0.4 mol L-1 HCl. The sorption capacity of the functionalized sorbent is 0.072 mmol uranium(VI) g(-1) modified silica gel. The relative standard deviation and detection limit were 1.2% (n = 10) for 1 mu g uranium(VI) mL(-1) solution and 0.038 mu g L-1, respectively. The method was employed to the preconcentration of U(VI) ions from spiked ground water samples.
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