A Lithium Ion-selective Optical Chemical Sensor Based on the Inner-filter Effect of Fluorescence

Abstract

Abstract: In this paper, an optical chemical sensor of fluorescence enhancement for lithium ion has been developed on the basis of ion-exchange sensing scheme. Asuitable fluorescent agent is incorporated in the plasticized PVCmembrane containing a lipophilic pH-indicator and lithium-selective neutral ionophore. Fluorescence varies as a function of the varying absorption of the pH-indicator, which in turn is modulated by the lithium concentration through the inner-filter effect of fluorescence. The response performance of the sensors and their theoretical response equations are reported. At pH₉ 0, the fluorescence response of the excellent sensor shows a good correlation with the theoretically derived formula in the linear range from 50×10^-4 to 50×10^-1 mol/Lwith a detection limit of 50×10^-5 mol/Llithium ion. The response time is about 1 min.

Key words: Inner-filter effect of fluorescence, Lithium ion, Optical chemical sensor

CLC Number:

O626.11

TrendMD:

ZHONG Jing-Rong, LIU Miao-Gen, AO Bing-Yun, YANG Xiao-Hai, WANG Ke-Min, XIAO Dan. A Lithium Ion-selective Optical Chemical Sensor Based on the Inner-filter Effect of Fluorescence[J]. Chem. J. Chinese Universities, 2001, 22(2): 191.

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A Lithium Ion-selective Optical Chemical Sensor Based on the Inner-filter Effect of Fluorescence

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