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广范pH试纸的荧光pH传感特性及应用
Fluorescence pH Sensing Characteristics and Applications of Universal pH-indicator Paper
- 发光学报 2018年39卷第6期 页码：877-883
- 作者机构：
南昌航空大学 江西省光电检测技术工程实验室,江西 南昌,330063
- 作者简介：
- 基金信息：国家自然科学基金（61167007，61665088）();航空科学基金（2016ZD56006）();江西省青年科学家培养计划（20153BCB23037）();江西
DOI：10.3788/fgxb20183906.0877
中图分类号： TP394.1;TH691.9纸质出版日期：2018-6-5，
网络出版日期：2018-1-18，
收稿日期：2017-9-28，
修回日期：2017-12-27，
扫 描 看 全 文
张巍巍, 赵小兵, 徐如辉. 广范pH试纸的荧光pH传感特性及应用[J]. 发光学报, 2018,39(6): 877-883
ZHANG Wei-wei, ZHAO Xiao-bing, XU Ru-hui. Fluorescence pH Sensing Characteristics and Applications of Universal pH-indicator Paper[J]. Chinese Journal of Luminescence, 2018,39(6): 877-883
张巍巍, 赵小兵, 徐如辉. 广范pH试纸的荧光pH传感特性及应用[J]. 发光学报, 2018,39(6): 877-883 DOI： 10.3788/fgxb20183906.0877.
ZHANG Wei-wei, ZHAO Xiao-bing, XU Ru-hui. Fluorescence pH Sensing Characteristics and Applications of Universal pH-indicator Paper[J]. Chinese Journal of Luminescence, 2018,39(6): 877-883 DOI： 10.3788/fgxb20183906.0877.
摘要
对广范pH试纸在pH值2.2~12.5范围内的荧光特性及基于试纸荧光的pH传感系统进行了探索。检测了不同pH缓冲液中浸渍过并晾干的pH试纸的光致发光，并分析了试纸荧光光谱的谱峰频移以及谱带重心频移。实验结果表明，pH试纸的荧光在实验pH区间的变化有明确的规律性，其中在弱酸碱性的pH值（4.0~9.0）范围内，谱带重心
B
随pH值近似线性变化，相应的经验传感方程为
B
=603.8-4.09pH。以pH为7对应的荧光谱带重心作参考，其相对灵敏度为0.71%/pH，实验系统的pH分辨力约为0.4。用该实验系统实际测试了稀的尿素水溶液及自来水的pH值，与商用电化学式pH计的结果一致，验证了实验方法及传感系统的通用性、实用性。该实验为pH检测提供了一种较比色读数更加精确客观、成本低廉、数据可靠、样品可保存可追溯的传感方法及测试系统。该系统还可以弥补广范pH试纸不能准确测试弱酸弱碱的不足。
Abstract
The fluorescence pH sensing characteristics and applications of universal pH-indicator paper in the pH range of 2.2-12.5 were researched. In the experiment
pH-indicator paper strips were dipped into different pH buffer solutions first
then aired dry to be tested under light excitation. The fluorescence spectra were analyzed using peak shift and band barycenter shift. Experimental results indicate that the fluorescence of pH-indicator paper depends on the pH value of tested solution
and the dependence is repeatable. In the pH range of 4.0-9.0
the barycenter wavelength of the emission band is linearly dependent on pH value. As a consequence
pH sensing function of
B
=603.8-4.09pH is obtained. When a pH value of 7 is set as a reference
the relative sensitivity is determined as 0.71%/pH. Resolution of the experimental setup is determined as 0.4. The applications on urea solution and tap-water verify the merit of the sensing method and the corresponding system. The research can offer an optoelectronic method and corresponding experimental system for remote pH sensing. Moreover
the fluorescence pH test is more precise than the strip color judgment with naked eyes
particularly for acidulous or alkalescent solutions.
关键词
pH试纸发射谱频移荧光传感
Keywords
pH-indicator paperemission spectrumband shiftfluorescence sensing
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