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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/45572

Title: On-Line HPLC-UV/Nano-TiO2-ICPMS System for the Determination of Inorganic Selenium Species.
Authors: Yuh-Chang Sun;Yu-Cheng Chang;Cheng-Kuan Su
Contributors: 國立臺灣海洋大學:生命科學系
Date: 2006
Issue Date: 2018-03-26T08:05:51Z
Publisher: Analytical Chemistry
Abstract: 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 limits0.06 and 0.03 ng mL-1 for Se(IV) and Se(VI), respectivelybecause 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 conversion efficiency of the analyte selenium species reached its maximum level within 36 s of irradiation, the working time (∼12 min) was limited primarily by time required for the chromatographic separation. A series of validation experimentsanalysis of the 1643e Standard Reference Material and natural water samplesindicated that our proposed methods can be applied satisfactorily to the determination of inorganic selenium species in water samples.
Relation: 78(8)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/45572
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