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Citation: ZHANG Lei, LIU Na, KANG Ping-Li, LI Qi, ZHOU Xin-Yu. Nanometer TiO₂ Microcolumn Preconcentration of Trace Selenium in Environment Samples[J]. Chinese Journal of Applied Chemistry, ;2010, 27(3): 323-327. doi: 10.3724/SP.J.1095.2010.90206 shu

Nanometer TiO₂ Microcolumn Preconcentration of Trace Selenium in Environment Samples

College of Chemistry, Liaoning University, Shenyang 110036

Received Date: 26 March 2009
Revised Date: 17 May 2009

A method using a microcolumn packed with nanometer TiO₂ as solid-phase extractant has been developed for the preconcentration of trace amounts of Se(Ⅳ) prior to the measurement by ultraviolet spectrophotometry.Effects of pH,sample flow rate and volume,elution solution and interfering ions on the recovery of the analytes have been investigated.The sorption was optimized with respect to the pH,maximum sorption was achieved from the solutions of pH 1~6.The optimum sample flow rate to adsorb Se(Ⅳ) ions was 0.5 mL/min,and the adsorption percentage was 98.3%.Sorbed Se(Ⅳ) was desorbed with 1.0 mL of 0.1 mol/L NaOH,with an enirchment of 40.The detection limit(3 σ) of the method for Se(Ⅳ) was 0.13 mg/L(n=13);and the relative standard deviation was 1.56% (n=13,c=10 mg/L).At room temperature,dynamic saturated adsorption capacity was 7.92 mg/g.The proposed method was applied to the determination of trace amounts of Se(Ⅳ) in GBW07280,the determined value was in good agreement with the certified value.
- flow injection,
- nano-TiO₂,
- selenium,
- microcolumn preconcentration
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通讯作者: 陈斌, bchen63@163.com

Nanometer TiO₂ Microcolumn Preconcentration of Trace Selenium in Environment Samples