Simultaneous extraction and preconcentration of uranium and thorium in aqueous samples by new modified mesoporous silica prior to inductively coupled plasma optical emission spectrometry determination.
A new 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) HNO(3). The preconcentration factor was 100 for a 100mL sample volume. The limits of detection (LOD) obtained for uranium(VI) and thorium(IV) were 0.3 microg 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.
School of Chemistry, University College of Science, University of Tehran, Tehran, Iran.
Seyed Reza
SR
Yousefi
Seyed Javad
SJ
Ahmadi
Farzaneh
F
Shemirani
Mohammad Reza
MR
Jamali
Masoud
M
Salavati-Niasari
D000327:Adsorption; D006863:Hydrogen-Ion Concentration; D015203:Reproducibility of Results; D012822:Silicon Dioxide / Q000737:chemistry*; D013057:Spectrum Analysis / Q000295:instrumentation / Q000379:methods*; D013910:Thorium / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*; D014501:Uranium / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*; D014875:Water Pollutants, Radioactive / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*
C509968:MCM-41; D014875:Water Pollutants, Radioactive; D014501:Uranium; D013910:Thorium; D012822:Silicon Dioxide