PMID: 16524098Mar 10, 2006Paper

Speciation of chromium by selective separation and preconcentration of Cr(III) on an immobilized nanometer titanium dioxide microcolumn

Journal of Separation Science
Pei LiangYan Liu

Abstract

Nanometer titanium dioxide immobilized on silica gel (immobilized nanometer-scale TiO2 particles) was prepared by a sol-gel method and characterized by X-ray diffraction and scanning electron microscopy. The adsorptive behavior of Cr(III) and Cr(VI) on immobilized nanometer TiO2 was assessed. Cr(III) was selectively sorbed on immobilized nanometer TiO2 in the pH range of 7-9, while Cr(VI) was found to remain in solution. A sensitive and selective method has been developed for the speciation of chromium in water samples using an immobilized nanometer TiO2 microcolumn and inductively coupled plasma atomic emission spectrometry. Under optimized conditions (pH 7.0, flow rate 2.0 mL/min), Cr(III) was retained on the column, then eluted with 0.5 mol/L HNO3 and determined by ICP-AES. Total chromium was determined after the reduction of Cr(VI) to Cr(III) by ascorbic acid. The adsorption capacity of immobilized nanometer TiO2 for Cr(III) was found to be 7.04 mg/g. The detection limit for Cr(III) was 0.22 ng/mL and the RSD was 3.5% (n = 11, c = 100 ng/ mL) with an enrichment factor of 50. The proposed method has been applied to the speciation of chromium in water samples with satisfactory results.

References

Mar 7, 2001·Fresenius' Journal of Analytical Chemistry·P LiangZ Jiang
May 1, 1982·Talanta·T M Florence

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Citations

Mar 10, 2010·Journal of Hazardous Materials·Yasemin BakirciogluSuleyman Akman
Nov 8, 2015·Journal of Hazardous Materials·Jian Rong ZhangNian Bing Li
Dec 13, 2016·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Shelja TiwariReena Saxena
Aug 13, 2013·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry· SarenqiqigeKazuhisa Yoshimura
Dec 15, 2015·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Reena SaxenaShelja Tiwari
Jun 2, 2016·Chemistry : a European Journal·Wenhu ZhouJuewen Liu
Oct 4, 2007·Water Environment Research : a Research Publication of the Water Environment Federation·Yabing XiaoMan Zhang
Oct 4, 2011·Talanta·Pablo H PachecoLuis D Martinez

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