Solid phase extraction and preconcentration of uranium(VI) and thorium(IV) on Duolite XAD761 prior to their inductively coupled plasma mass spectrometric determination

• Published in: Talanta (Oxford) Vol. 72; no. 1; pp. 187 - 192
• Main Authors: Aydin, Funda Armagan, Soylak, Mustafa
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15.04.2007; Oxford Elsevier
• Subjects: Analytical chemistry; Applied sciences; Chemistry; Duolite XAD761; Environmental samples; Exact sciences and technology; Global environmental pollution; ICP-MS; Pollution; Solid phase extraction; Spectrometric and optical methods; Thorium(IV); Uranium(VI); Duolite XAD761; Solid phase extraction; Environmental samples; ICP-MS; Thorium(IV); Uranium(VI); Trace analysis; Elution; Coupled method; Interference; Replica method; Inductive coupling plasma spectrometry; Chemical enrichment; Hydrochloric acid; Adsorption; Detection limit; Uranium VI; Environment; Cations; Standard deviation; Mass spectrometry; Thorium IV; Uranium IV
• ISSN: 0039-9140; 1873-3573
• DOI: 10.1016/j.talanta.2006.10.013

A simple and effective method is presented for the separation and preconcentration of thorium(IV) and uranium(VI) by solid phase extraction on Duolite XAD761 adsorption resin. Thorium(IV) and uranium(VI) 9-phenyl-3-fluorone chelates are formed and adsorbed onto the Duolite XAD761. Thorium(IV) and uranium(VI) are quantitatively eluted with 2 mol L −1 HCl and determined by inductively coupled plasma-mass spectrometry (ICP-MS). The influences of analytical parameters including pH, amount of reagents, amount of Duolite XAD761 and sample volume, etc. were investigated on the recovery of analyte ions. The interference of a large number of anions and cations has been studied and the optimized conditions developed have been utilized for the trace determination of uranium and thorium. A preconcentration factor of 30 for uranium and thorium was achieved. The relative standard deviation ( N = 10) was 2.3% for uranium and 4.5% for thorium ions for 10 replicate determinations in the solution containing 0.5 μg of uranium and thorium. The three sigma detection limits ( N = 15) for thorium(IV) and uranium(VI) ions were found to be 4.5 and 6.3 ng L −1, respectively. The developed solid phase extraction method was successively utilized for the determination of traces thorium(IV) and uranium(VI) in environmental samples by ICP-MS.