AbstractAn optical pH sensing material has been prepared in this study by using sol-gel technique. Bromothymol blue, bromophenol blue and thymol blue were chosen in this study as acidbase indicators for strong acid-strong base, strong acid-weak base and weak acid-strong base titration, respectively. The results show that these indicators could be successfully entrapped inside the sol-gel film and still maintain its chemical behaviour as in solution. The entrapped acid-base indicators respond well to any pH changes and could be used to determine the end-point of the acid-base titration.
Narayanaswamy, R. 1985. Optical Fibre Sensors In Chemical Analysis: Fibre Optics For Chemical Sensing. Anal. Proc. 22 : 204-206.
Seitz, W.R. 1984. Chemical Sensors Based On Fiber Optics, Anal. Chem. 56(1): 16A-34A.
Alder J.F., 1986, Optical fibre Chemical Sensors, Fresenius Z. Anal. Chem, 324, 372.
Narayanaswamy R and F. Sevilla III, 1988, Optical Fibre Sensors for Chemical Species, J. Phys. E. Sci. lnstrum., 21, D
Wolfbeis O.S., 1986, Analytical Chemistry with Optical Sensors, Fresenius Z.
Anal.Chem., 325, 387.
Norris J.O.W., 1989, Current status and Prospects for the Use of Optical Fibres in Chemical Analysis, Analyst, 114, 1359.
Narayanaswamy R., 1993, Chemical Transducers Based on Fiber Optics for Environmental Monitoring, The Science of the Total Environment, 135, 103.
Saari L.A., 1987, Trends in Fiber Optic Sensor Development, Trends in Analytical Chemistry, 6(4), 85.
Alabbas, S.H, Ashworth, D.C & Narayanaswamy, R. 1989. Design and Performance Features of an Optical-fibre Reflectance pH Sensor. Anal. Proc 26:373.
Otto S. Wolf beis, Rodriguez N.V. and T. Werner, 1992, LED-Compatible Fluorosensor for Measurement of Near-Neutral pH Values, M ikrochim. Acta, 108, 113.
Munkholm C., Walt D.R., Milanovich F.P. and S.M. Klainer, 1986, Polymer Modification of Fiber Optic Chemical Sensors as a Method of Enhancing Fluorescence Signal for pH Measurement, Anal. Chem., 58, 1427.
Ding J.Y., Shahriari M.R. and Sigel G.H., 1991, Fibre Optic pH Sensors Prepared by Sol-Gel Immobilisation Technique, Electronics Letters, 27 (17), 1560.
Kirkbright G.K., R. Narayanaswamy and N.A. Welti, 1984, Fibre Optic pH Probe Based on the Use of an Immobilised Colorimetric Indicator, Analyst, 109, 1025.
Peterson J.I., S.R. Goldstein and R.V. Fitzgerald, 1980, Fiber optic pH Probe for Physiological Use, Anal. Chem., 52, 864.
Moreno M.C., Jimenez M., Conde C.P. and Camara C., 1990,Analytical Performance of an Optical pH Sensor for Acid-Base Titration, Anal. Chim. Acta , 230, 35.
Gupta B. D. and S. Sharma, 1998, A long-range fiber optic pH sensor prepared by dye doped sol-gel immobilization technique, Optics Communications, 154 (5-6), 282.
Xu Z., R. Andrew, A. Ricardo and M. Roger, 1998, Novel fiber-optic pH sensor incorporating carboxy SNAFL-2 and fluorescent wavelength-ratiometric detection, Journal of Biomedical Materials Research, 39, (!), 9-15.
Grant S.A. and R. S. Glass, 1997, A sol-gel based fiber optic sensor for local blood pH measurements, Sensors and Actuators B: Chemical, 45(1), 35-42.
Pilar M.D., T. Sotomayor, M. A. De Paoli and W. A.Oliveira, 1997, Fiber optic pH sensor based on Poly(o-methoxyaniline), Analytica Chimica Acta, 353 (2-3), 275-280.
Wallace P.A., M. Campbell, Y.Yang, A.S.Holmes-Smith and M.Uttamlal, 1997, A distributed optical fibre fluorosensor for pH measurement, Journal ()f Luminescence, 72-74, 1017-1019.
McCulloch, S. and Uttamchandani D., 1997, Development of a fibre optic micro optrode for intracellular pH measurements, IEE Proceedings Optoelectronics, 144 (3), 162-167
Bromberg A., J. Zilberstein, G. Frishman, S. Riesemberg, E. Benari, E. Silberstein,
J. Zimnavoda and A. Kritzman, 1996, Optical-fibre sensors for blood gases and pH, based on porous glass tips, Sensors and Actuators B: Chemical, 31(3), 181-191
Zhang S. F. , Y. A. B. D. Wickramasinghe and P. Rolfe, 1996, Investigation of an optical fibre pH sensor with the membrane based on phospholipid copolymer, Biosensors and Bioelectronics, 11(1-2), 11-16.
Netto E. J. , J. I. Peterson, M. McShane and V. Hampshire, 1995, A fiber-optic broad-range pH sensor system for gastric measurements, Sensors and Actuators B:Chemical, 29 (1-3), 157-163.
Motellier S. , M. H. Noir<;::, B. Dur<;::ault and H. Pitsch, 1995, pH determination of clay interstitial water using a fiber-optic sensor, Sensors and Actuators B:Chemical, 29(1-3).
Zhang S., Tanaka S., Wickramasinghe Y.A.B.D. and Rolfe P., 1995, Fibre-optical sensor based on fluorescent indicator for monitoring physiological pH values, Medical & Biological Engineering & Computing, 33(2), 152-156.
Ding, J.Y. , Shahriari, M.R , Sigel, G.H. 1991. Fiber Optic pH Sensors Prepared By Sol Gel Immobilisation Technique. Electronic Letters. 27 : 1560-1562
Musa A. and Q. A. Ling, 1997, Sol-Gel Film Doped with Phenolpthalien: Potential Use for C02 Sensor, Pertanika J. Sci. And Techn., 5(2), 157-167
Musa A. and L. M. Shu, 1997, Doping of Bromotymol Blue onto Glass Matrices Prepared by Sol-Gel Technique Using Silica Oxide, Aluminium Oxide and Magnesium Oxide as Starting Materials, The Malaysian Journal of Analytical Science, 3(2), 281-288.
Musa, A. and R. Narayanaswamy. 1995. The use of sol-gel film as a matrix for immobilisation of some fluorimetric reagents. In Polymers and Other Advanced Materials: Emerging Technologies and Business Opportunities ed. P.N. Prasad, E. Mark and T.J. Fai, p. 727-737. New York: Plenum Press.
Musa, A. and R. Narayanaswamy. 1995. Entrapment of Some Aluminium(III) Sensitive Reagents in Sol-Gel Films. Bull. Singapore Nat. Inst. Chem., 23, 55-60.
Christian, G.D. 1994. Analytical Chemistry. Ed. Ke-5. New York : John Wiley & Sons, Inc. 172-177 , 220-232.
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