ZHENG Zhi-yong,SUN Li-na
(Department of Food and Biological Engineering, Zhangzhou Institute of Technology, Zhangzhou 363000,China)
Abstract: Bi (III) could catalyze the oxidation reaction between K2S2O8 and methylene blue (MB), causing the dramatical quenching of the room temperature phosphorescence (RTP) signal of MB, and the ∆IP of the system was linear to the content of Bi(III). Thus, solid substrate room temperature phosphorescence (SSRTP) for the determination of trace Bi (III) has been established. The linear range of this method was 0.040~1.0 ×10–15g/mL, the regression equation of working curve was ∆IP =2.336+27.26×10–15CBi3+( g/mL), n = 6, correlation coefficient (r) was 0.9980, and detection limit (LD) was 1.9 ×10–15 g/mL. This sensitive, simple and rapid method has been applied to determine trace Bi(III) in water samples with satisfactory results. The reaction mechanism was also discussed.
Key words: Bi (III); methylene blue; K2S2O8; catalytic solid substrate room temperaturephosphoremitry
E-mail: 258zzy@163.com
Analysis and Testing Technology and Instruments, Vol. 18, No. 3, 2012,167-175
