用于pH测定的光化学敏感膜  

An Optical Chemical Sensing Membrane for the Detemination of pH

作　　者：罗发亮[1] 刘志宏[1] 陈天禄[1] 

机构地区：[1]中国科学院长春应用化学研究所高分子物理与化学国家重点实验室,长春130022

出　　处：《分析化学》2005年第4期483-486,共4页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金资助项目(No. 50273037)

摘　　要：以二醋酸纤维素做基质采用包埋法将刚果红固定, 制备成一种平均厚度为5 μm的光化学pH敏感膜(CCM).利用紫外-可见光谱仪探讨了pH响应性能.结果表明, 该膜对pH在2.50～4.76范围内的变化呈线性响应,其热力学常数pKa为3.61±0.03,响应时间在10 s以内,同时也考察了该膜的重现性、稳定性以及电解质对该膜的光吸收性质的影响.An optical chemical sensing membrane was prepared based on Congo red immobilized on cellulose diacetate via embedded. The pH response performances of the membrane were examined with ulraviolet-visible spectrophotometer. The results indicate that the membrane has a linear response for pH values between 2. 50 and 4. 76, pK(a) is 3. 61 +/- 0. 03, and the response time is all within 10 s. Additionally, effects of electrolyte, reproduction and stability of the membrane were also studied.

关 键 词：光化学敏感膜 PH测定 二醋酸纤维素 热力学常数 响应性能 线性响应 响应时间 吸收性质 刚果红 包埋法 光谱仪 重现性 电解质 稳定性 平均 可见 

分 类 号：O657.1[理学—分析化学]