Sains Malaysiana 33(2): 75-82 (2004)                                                           Sains Fizis dan Gunaan /

                                                                                                                                Physical and Applied Sciences

Bahan untuk Pengesanan pH Menggunakan Membran

Nafion Terdop dengan Reagen Fenol Merah

(Sensing Material for pH Detection Using Nafion Membrane

Doped with Phenol Red-Reagent)

Nur Azlinawati  Md. Khlid & Musa Ahmad

Pusat Pengajian Sains Kimia dan Teknologi Makanan

Fakulti Sains dan Teknologi

Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor D.E.,.Malaysia

ABSTRAK

Bahan sensor untuk pengesanan pH telah disediakan dengan memegunkan reagen fenol merah dalam membran nafion. Slaid kaca yang berukuran 3 in × 1 in telah digunakan sebagai penyokong. Setelah dipegunkan. membran terdop dengan reagen fenol merah dicirikan menggunakan Spektrofotometer uL-Nampak untuk mengkaji kebolehulangan. kestabilan foto dan kesan terhadap pH berbeza. Hasil kajian menunjukkan bahawa bahan ini boleh digunakan sebagai bahan sensor dalam pembinaan sensor optik pH kerana reagen berjaya dipegunkan dan memberikan rangsangan yang baik pada pH yang berbeza.

ABSTRACT

Optical sensing material for detection of pH has been prepared by immobilising phenol red in nafion membrane. Glass slides with dimension 3 in × 1 in were used as a support. The nafion membrane doped with phenol red was characterized by using uv-Visible Spectrophotometer to study the responses at different pH, repeatability and photo stability. The sensing materials were able to be used for the development of an optical pH sensor since the reagent could be successfully immobilised and produced good responses at different pH.

RUJUKAN/REFERENCES

Anantaraman, A.V. & Gardner, C.L. 1996. Studies on Ion-Exchange Membranes. Part 1. Effect of Humidity on the Conductivity of Nation. Journal of Electroanalytical Chemistry. 414: 115-120.

Birch, D.J.S., Holmes, A.S., Darbyshire, M. 1995. Intelligent Sensors for Metal Ion Based Fluorescence Energy Transfer. Measur. Sci. Technol. 6: 243-247.

Fifleid F.W. & Kealey D., 1975.  Principle and Practice of Analytical Chemistry, Kingston, International Textbook Comp. Ltd.

Heitner-Wiguin, C. 1996.  Recent Advances in Perfluorinated Ionomet Membrane:  Structure, Properties and Applications. Journal of Membrane Science. 120: 1-33.

Handbook of Chemistry and Physics 1999-2000, Ed. Ke 80, USA, CRC Press.

Ho, K. C. & Hung, W. T. 2001. An Amperometric NO₂ Gas Sensor Based on Pt Nafion Electrode. Sensors and Actuators B. 79: 11-16.

Nor Azah Yusof & Musa Ahmad. 2002. A Flow Cell Optosensor for Lead Based on Immobilized Gallocynin in Chitosan Membrane. Talanta. 58: 459-466.

Ramkumar, J., Shrimal, K. S., Maiti, B. & Krishnamoorthy, T. S. 1996. Selective Permeation of Cu²+ & UO²⁺ Through a Nation Ionomer Membrane. Journal of membrane science. 116: 31-37.

Safavi, A., Abdollahi, H. 1998. Optical Sensor for High Values. Analytica Chimica Acta. 367: 167-173.

Zinger, B & Sheir, P. 1988. Spectroscopic Studies of Cation Dye in Nafion: Preliminary Investigation of a New Sensor for Hydrophilic Contamination of Inorganic Solvents. Sens. Actuators B. Chem. 56 :206-214.