Analytical Sciences

ICP-AES Detection of UltratraceAluminum(III) and Chromium(III) Ions with a Microcolumn PreconcentrationSystem Using Dynamically Immobilized 8-Hydroxyquinoline on TiO₂Nanoparticles

Pei LIANG, Lanhao YANG, BinHU,  and Zucheng JIANG

Department of Chemistry, WuhanUniversity, Wuhan 430072, People's Republic of China

Titanium dioxide nanoparticle dynamically loaded with8-hydroxyquinoline (nanometer TiO₂-Oxine) was used as asolidphase extractant for the preconcentration of trace amounts ofaluminum(III) and chromium(III) prior to their determination by inductivelycoupled plasma atomic emission spectrometry (ICP-AES). The optimalconditions for preparing nanometer TiO₂-Oxine were obtained.Also, the separation/preconcentration conditions of analytes, including theeffects of the pH, the sample flow rate and the volume, the elutionsolution and the interfering ions on the recovery of the analytes wereinvestigated. At pH 6.0, the adsorption capacity of nanometerTiO₂-Oxine was found to be 5.23 mg g^-1 and 9.58 mgg^-1 for Al(III) and Cr(III), respectively. An enrichment factorof 50 was achieved by this method, and the detection limits (3σ) forAl(III) and Cr(III) were 1.96 and 0.32 µg L^-1 respectively.The proposed method was applied for the determination of trace Al(III) andCr(III) in biological samples and lake water with satisfactoryresults.

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