On-line HPLC-UV/Nano-TiO2-ICPMS system for the determination of inorganic selenium species

Analytical Chemistry
Y C SunC K Su

Abstract

We have developed an UV/nano-TiO2 vapor generation (VG) device that when coupled between a chromatographic column and an ICP mass spectrometer provides a simple and sensitive hyphenated method for the determination of Se(IV) and Se(VI) without the need to use conventional chemical VG techniques. Because our proposed VG device allows both Se(IV) and Se(VI) species in the column effluent to be converted on-line into volatile Se products, which are then measured directly by the ICPMS, the safety risks and the probability of contamination arising from the use of additional chemicals are both low. To achieve the maximum signal intensity, we optimized a number of the operating parameters of the UV/nano-TiO2 VG device, including the acidity, the amounts of TiO2 and formic acid, and the length of the reaction coil, with respect to their effects on the reduction efficiency of the analyte species. This hyphenated method achieves excellent detection limits-0.06 and 0.03 ng mL(-1) for Se(IV) and Se(VI), respectively-because of the high efficiencies of the conversions of Se(IV) and Se(VI) to their respective volatile products and the lower blank level achieved, relative to those of other traditional systems. In addition, because the convers...Continue Reading

Citations

Jan 20, 2007·Analytical and Bioanalytical Chemistry·Yihua HeRalph E Sturgeon
Mar 3, 2007·Analytical and Bioanalytical Chemistry·Mariana A VieiraRalph E Sturgeon
Jan 3, 2007·Journal of Mass Spectrometry : JMS
Feb 19, 2010·Analytical and Bioanalytical Chemistry·Christophe R QuételKonstantin I Hadjiivanov
Feb 6, 2019·Analytical Chemistry·Yonggang DingYing Gao

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