Malaysian Journal of Analytical Sciences Vol 25 No 2 (2021): 296 - 310

 

 

 

 

SENSOR ION Al3+ OPTIK BERASASKAN ERIOKROM SIANIN R TERPEGUN DALAM MEMBRAN POLIMER TERANGKUM MENGGUNAKAN PRINSIP PENGUKURAN SERAPAN

 

(An Optical Sensor For Al3+ Ion Based on Immobilized Eriochrome Cyanine R in Polymer Inclusion Membrane using Absorption Sensing Principle)

 

Faiz Bukhari Mohd Suah1*, Musa Ahmad2, Lee Yook Heng3

 

1Green Analytical Chemistry Laboratory, School of Chemical Sciences,

Universiti Sains Malaysia, 11800 Minden, Pulau Pinang, Malaysia

2Faculty of Science and Technology,

Universiti Sains Islam Malaysia, 71800 Nilai, Negeri Sembilan, Malaysia

3School of Chemical Sciences and Food Technology, Faculty of Science and Technology,

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

 

*Pengarang Utama:  fsuah@usm.my

 

 

Received: 7 February 2021 ; Accepted: 18 March 2021; Published:  25 April 2021

 

 

Abstrak

Sensor optik bagi pengesanan ion aluminium (Al3+) berasaskan reagen terpegun dalam membran polimer terangkum (PIM) telah dibangunkan dalam kajian ini. Sensor ini menggunakan eriokrom sianin R (ESR) sebagai reagen dan prinsip pengukuran serapan sebagai kaedah pengesanan ion Al3+. Bahan sensor PIM yang digunakan dalam kajian ini mengandungi selulosa triasetat 60% berat (m/m): Aliquat 336 30% berat (m/m): dioktil ftalat 10% berat (m/m) dan ESR dengan kepekatan 5.00 × 10-4 mol L-1. Sensor berasaskan PIM ini menghasilkan rangsangan yang lebih tinggi berbanding sensor tidak berasaskan PIM. Masa optimum rangsangan sensor ialah pada lima minit dengan nilai pH optimum 6.0. Sensor ini memberikan julat rangsangan linear pada julat kepekatan ion Al3+ 7.41 × 10-6 - 4.44 × 10-4 mol L-1, dengan had pengesanan terendah 5.63 × 10-6 mol L-1. Sifat kepilihan yang tinggi kepada ion Al3+ turut ditunjukkan oleh sensor ini kecuali gangguan minima daripada ion Be2+ dan Fe3+. Akhir sekali, sensor ini telah digunakan bagi penentuan ion Al3+ dalam beberapa sampel air semula jadi. Keputusan analisis menunjukkan sensor ini mampu menghasilkan keputusan yang setara dengan spektrofotometer serapan atom konvensional.

 

Kata kunci:  sensor Al3+, Aliquat 336, eriokrom sianin R, membran polimer terangkum

 

Abstract

An optical sensor for aluminium ion (Al3+) based on immobilized reagent in polymer inclusion membrane (PIM) was developed in this study. This sensor utilized eriochrome cyanine R (ECR) as its reagent and absorption sensing principle as the method for Al3+ ion sensing. PIM’s sensing material used in this study consists of cellulose triacetate 60% mass (m/m): Aliquat 336 30% mass (m/m): dioctyl phthalate 10% mass (m/m) and ECR with concentration of 5.00 × 10-4 mol L-1. This sensor which based on immobilized PIM produced higher response compared to sensor based on non-immobilized PIM. Optimum response time of this sensor was five minutes with an optimum pH value of 6.0. This sensor also produced a linear response range for Al3+ ion concentration of 7.41 × 10-6 - 4.44 × 10-4 mol L-1, with detection limit of 5.63 × 10-6 mol L-1. High selectivity towards Al3+ ion was also demonstrated by this sensor, except minimal interferences from Be2+ and Fe3+ ions. Finally, this sensor was applied for the determination of Al3+ ion in natural water samples. Results shows this sensor is capable of producing comparable output to conventional atomic absorption spectrophotometer.

 

Keywords:  Al3+ sensor, Aliquat 336, eriochrome cyanine R, polymer inclusion membrane

 

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