ZHANG Li-hong,LI Zhi-ming,ZHANG De-shun,SUN Li-na
(Department of Food and Biological Engineering, Zhangzhou Institute of Technology, Zhangzhou 363000,China)
Abstract: According to the academic thought that trace Se(Ⅳ) could catalyze the oxidation reaction between K2S2O8 and isatin (Isa) causing the sharp quenching of the room temperature phosphorescence (RTP) signal of Isa. A catalytic solid substrate room temperature phosphorimetry (SSRTP) for the determination of trace Se (IV) has been established. This method has a high sensitivity (with a detection limit (LD) of 0.015 pg/mL), a wide linear range (4.00×10-8~4.00×10-6 µg/mL), the regression equation of the working curve was △IP = 2.948 + 63.245 CSe(IV) (pg/mL, n = 7), and correlation coefficient (r) was 0.9997. It has been applied to the determination of residual Se (IV) in practical samples. The results agreed well wirh those of ultraviolet spectrophotometry. The reaction mechanism of catalytic SS-RTP for the determination of residual Se (IV) was also discussed.
Key word: Selenium (IV); Isatin; K2S2O8; catalytic solid substrate room temperature phosphorime
E -mail: 513713059@qq.com
Analysis and Testing Technology and Instruments, Vol. 18, No. 3, 2012,159-166
