Sains Malaysiana 36(1): 33-38 (2007)

Potensi Reagen Fenilfluoron sebagai Penunjuk Ph

untuk Pembangunan Sensor Optik pH

(Potential of Phenylfluorone as pH Indicator for an Optical pH Sensor Development)

Rosmawani Mohammad, Musa Ahmad & Jamaluddin Mohd Daud

Pusat Pengajian Sains Kimia & Teknologi Makanan

Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia

43600 Bangi, Selangor DE. Malaysia

ABSTRAK

Potensi larutan reagen fenilfluoron untuk digunakan sebagai bahan reagen bagi pembangunan sensor optik pH dibincangkan dalam kajian ini. Reagen ini dipilih kerana ia belum pernah dilaporkan sebelum ini untuk digunakan sebagai bahan reagen bagi pembangunan sensor optik pH. Berdasarkan kajian larutan yang telah dijalankan, julat rangsangan linear pH bagi reagen fenilfluoron ialah antara pH 4–11. Perubahan warna dapat diperhatikan, iaitu warna kuning dalam asid kuat, warna oren dalam asid lemah serta bes lemah dan warna ungu dalam bes kuat. Perubahan warna yang berlaku adalah lebih kurang 5 saat. Reagen fenilfluoron mempunyai kestabilan foto yang baik dengan nilai RSD 0.33% untuk tempoh kajian selama 95 hari. Nilai RSD bagi kebolehulangan pada pH 2, pH 7 dan pH 12 adalah masing-masingnya sebanyak 2.6%, 0.9% dan 1.4%. Pemerhatian ini menunjukkan fenilfluoron mempunyai potensi yang baik untuk digunakan sebagai bahan reagen bagi pembangunan sensor optik pH.

Kata kunci: Fenilfluoron; penunjuk pH; sensor optik pH

ABSTRACT

The potential of phenylfluorone reagent solution for the development of optical pH sensor was discussed in this study. Phenylfluorone has been chosen because it has never been reported before for use in the development of optical pH sensor. Results from the study showed that a linear pH range for this reagent was pH 4–11. The colour changes were to yellow in strong acid, orange in both weak acid and weak base and purple in strong base. The colour change was within 5 seconds. Phenylfluorone has a good photostability with RSD value 4.2% for a study period of 95 days. The RSD values of the reproducibility study were found to be 2.6%, 0.9% and 1.4% for pH 2, pH 7 and pH 12, respectively. These observations indicate that phenylfluorone has a good potential for used as a sensing reagent for development of optical pH sensor. 

Keywords: Phenylfluorone; pH indicator; optical pH sensor

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