Sains Ma1aysiana 25(3): 69-76 (1996)                                                                          Sains Fizis dan Gunaan/

                                                                                                                                        Physical and Applied Sciences

Prob Bolehbuang Berasaskan Gentian Optik untuk

Analisis Ion Al (III) di dalam Air

(Optical fibre based disposable probe to analyze Al(III) ion in water)

Musa Ahmad

Jabatan Kimia

Fakulti Sains Fizis & Gunaan

Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor D.E.

Ramaier Narayanaswamy

Department of Instrumentation & Analytical Science

UMIST, P.O. Box 88

Manchester M60 1 QD, England

ABSTRAK

Gentian optik telah digunakan di dalam kajilidikan ini sebagai pemandu cahaya daripada sumber cahaya kepada prob. Prob jenis bolehbuang yang dibina dalam kajian ini terdiri daripada reagen Chrome Azurol S (CAS) yang telah dipegunkan di atas penyokong polimer (XAD-2) dan dipegang olehjaring nilon. Penderia ini boleh dijanakan semula menggunakan larutan fluorida, mempunyai had pengesaran 1.0 ´ 10^-5 M, kebolehulangan yang tinggi (ralat relatif < 5.0%) dan boleh digunakan untuk penentuan Al(III) dalam air pada julat kepekatan 1.3 ´ 10^-5 M - 7.0 ´ 10^-4 M. Keputusan analisis yang diperolehi menggunakan penderia ini adalah bolehbanding dengan kaedah yang telah diterima umum seperti spektrofotometri serapan atom mertggunakan relau grafit. EDTA, fosfat, oksalat, tartrat, Cu(II), Fe(III), Be(II) dan Ca(III) didapati menganggu semasa penentuan Al(III) di dalam air.

ABSTRACT

Optical fibre has been used in this study to guide a light from the light source to the probe. A disposable type probe developed in this study consist of a reagent Chrome Azurol S (CAS) immobilised on a polymeric support (XAD-2) which has been coupled to a fibre end using nylon mesh. This sensor was regenerable using fluoride solution with a limit of detection of 1.0 ´ 10^-5 M, high reproducibility (relative error of < 5.0%) and can be used for Al(III) determination in water at concentration range of 1.3 ´ 10^-5 M - 7.0 ´ 10^-4 M. The results obtained using this sensor is comparable to the well established method such as atomic absorption spectrophotometry using graphite furnace. EDTA, phosphate, oxalate, tartrate, Cu(II), Fe(III), Be(II) and Ca(III) were found to interfere during Al(III) determination in water.

RUJUKAN/REFERENCES

Ahmad M. 1990. Penderia Kimia Gentian Optik. BuI.Kim,. 4(2): 52-60.

Ahmad M. & Narayanaswamy R. 1994. Fibre Optic Reflectance Sensor for the Determination of Al (III) in Aqueous Environment. Anal. Chim. Acta. 291:     255-260. 

Ahmad M. & Narayanasawamy R. 1995. Flow-cell Optosensors for monitoring Al (III) based on. Science of the Total Environment 153: 221-227.