Journal
TALANTA
Volume 80, Issue 1, Pages 212-217Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2009.06.058
Keywords
Preconcentration; Determination of uranium and thorium; Mesoporous silica (MCM-41); Solid phase extraction (SPE); Inductively coupled plasma optical emission spectrometry (ICP OES)
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Funding
- The Research Council of University of Tehran
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Anew synthesized modified mesoporous silica (MCM-41) using 5-nitro-2-furaldehyde (fural) was applied as an effective sorbent for the solid phase extraction of uranium(VI) and thorium(IV) ions from aqueous solution for the measurement by inductively coupled plasma optical emission spectrometry (ICP OES). The influences of some analytical parameters on the quantitative recoveries of the analyte ions were investigated in batch method. Under optimal conditions, the analyte ions were sorbed by the sorbent at pH 5.5 and then eluted with 1.0 mL of 1.0 mol L-1 HNO3. The preconcentration factor was 100 for a 100 mL sample volume. The limits of detection (LOD) obtained for uranium(VI) and thorium(IV) were 0.3 mu g L-1. The maximum sorption capacity of the modified MCM-41 was found to be 47 and 49 mg g(-1) for uranium(VI) and thorium(IV), respectively. The sorbent exhibited good stability. reusability, high adsorption capacity and fast rate of equilibrium for sorption/desorption of uranium and thorium ions. The applicability of the synthesized sorbent was examined using CRM and real water samples. (C) 2009 Elsevier B.V. All rights reserved.
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