Fiber-Optic pH Sensor

The new enhancement in the determination of pH using optical fiber system is described here. This work uses the membrane made of cellulose acetate membrane for reagent immobilization and congo red (pK a 3.7) and neutral red (pK a 7.2) as pH indicators. An effective covalent chemical binding procedure is used to immobilize the indicators. The response time, reversibility, linear range, reproducibility, and long-term stability of fiber optic sensor with congo red as well as neutral red have been determined. The linear range measured for the sensor based on the congo red and neutral red is 4.2–6.3 and 4.1–9.0, respectively. The response time of sensor membrane is measured by varying the substance pH values between 11.0 and 2.0.

[1]  Steven S Saavedra,et al.  Evanescent sensing in doped sol-gel glass films , 1994 .

[2]  Aleksandra Lobnik,et al.  Stability of new optical pH sensing material based on cross-linked poly(vinyl alcohol) copolymer , 2002 .

[3]  Ryszard S. Romaniuk,et al.  Fiber optic probe for monitoring of drinking water , 1997, Other Conferences.

[4]  Jie Lin,et al.  Recent development and applications of optical and fiber-optic pH sensors , 2000 .

[5]  Yordan Kostov,et al.  Rapid Covalent Method for Fabrication of Optical pH Sensitive Membranes , 2000 .

[6]  Artur Dybko,et al.  Cellulose based bulk pH optomembranes , 1998 .

[7]  J. Peterson,et al.  A fiber-optic broad-range pH sensor system for gastric measurements , 1995 .

[8]  P. Bechi,et al.  In vivo optical-fibre pH sensor for gastro-oesophageal measurements , 1995 .

[9]  Dong Liu,et al.  An optical pH sensor with a linear response over a broad range , 2000 .

[10]  Yordan Kostov,et al.  Bioprocess monitoring. , 2002, Current opinion in biotechnology.

[11]  M. Loeffen,et al.  Industrial application to cattle of a method for the early determination of meat ultimate pH. , 2004, Meat science.

[12]  Stoyan Tzonkov,et al.  Membranes for optical pH sensors , 1993 .

[13]  Sheila A. Grant,et al.  A sol–gel based fiber optic sensor for local blood pH measurements , 1997 .

[14]  Zeev Rosenzweig,et al.  Fiber optic pH/Ca2+ fluorescence microsensor based on spectral processing of sensing signals , 1999 .

[15]  P. Krulevitch,et al.  In vitro and in vivo measurements of fiber optic and electrochemical sensors to monitor brain tissue pH , 2001 .

[16]  E. Saaski,et al.  Development of a medical fiber-optic pH sensor based on optical absorption , 1992, IEEE Transactions on Biomedical Engineering.

[17]  Marco Mascini,et al.  Enzyme-based optical-fibre biosensors , 1995 .

[18]  Melody M. Anderson,et al.  Continuous pH monitoring in a perfused bioreactor system using an optical pH sensor. , 2002, Biotechnology and bioengineering.

[19]  Delana A. Nivens,et al.  Multilayer sol-gel membranes for optical sensing applications: single layer pH and dual layer CO(2) and NH(3) sensors. , 2002, Talanta.

[20]  William F. Koch,et al.  A critical review of measurement practices for the determination of pH and acidity of atmospheric precipitation , 1984 .

[21]  A. Ensafi,et al.  Optical pH sensor based on chemical modification of polymer film , 1999 .