The Malaysian Journal of Analytical Sciences Vol 10 No 2 (2006): 217 – 224

 

 

BAHAN SENSOR UNTUK PENGESANAN FLUORIDA BERASASKAN KOMPLEKS Al-CAS TERPEGUN DALAM FILEM SOL-GEL

 

Musa Ahmad dan Chai Ee Uin

 

Pusat Pengajian Sains Kimia dan Teknologi Makanan

Fakulti Sains dan Teknologi

Universiti Kebangsaan Malaysia

43600 Bangi, Selangor Darul Ehsan

 

Abstract

An aluminium-chrome azurol S (Al-CAS) complex entrapped in a sol-gel film was found to respond well to the presence of fluoride ion in aqueous solution. The dip-coating technique was used to prepare the sol-gel film on microscope glass slide support from sol solution containing Al-CAS complex. The doped sol-gel film, which was transparent could be characterized by using UV-visible Spectrophotometer. The study showed that the entrapped Al-CAS complex changed its colour from pink to yellow when dipped in fluoride solution at optimum pH of 5.5. The sensing material was found to be reproducible when reacted with fluoride ion (RSD = 5.3 %) and showed good photo stability (RSD 3.7%) for at least 8 hours duration. However, the signal produced by the sensing material is weak and electronic data processing method is needed to amplify the signal.

 

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