Malaysian Journal of Analytical Sciences Vol 21 No 4 (2017): 793 - 800

DOI: https://doi.org/10.17576/mjas-2017-2104-05

 

 

 

EFFECT OF NON-IONIC SURFACTANTS TO THE Al(III)-MORIN COMPLEX AND ITS APPLICATION IN DETERMINATION OF Al(III) IONS: A PRELIMINARY STUDY

 

(Kesan Surfaktan Tak-Ionik Kepada Kompleks Al(III)-Morin dan Aplikasinya dalam Penentuan Ion Al(III): Satu Kajian Awal)

 

Faiz Bukhari Mohd Suah¹*, Musa Ahmad², Faizatul Shimal Mehamod³

 

¹School of Chemical Sciences,

Universiti Sains Malaysia, 11800 Minden, Pulau Pinang, Malaysia

²Faculty of Science & Technology,

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

³School of Fundamental Science,

Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia

 

*Corresponding author: fsuah@usm.my

 

 

Received: 5 October 2016; Accepted: 11 May 2017

 

 

Abstract

A simple and sensitive spectrofluorimetric method for the determination of Al(III) based on the formation of Al-Morin-Triton X-100 ternary complex is described. The effect of other non-ionic surfactants, such as Tween 80, Tween 20 and octylglucoside (OG) on fluorescence analysis were also studied. The addition of Triton X-100 makes feasible the fluorimetric determination of submicrogram quantities of Al(III). The complex was excited at 410 nm and the fluorescence signal was measured at 495 nm. Maximum fluorescence signal was produced at pH 4.0 (acetic acid-acetate buffer), with 0.6% Triton X-100 and 1.35 × 10^-3 mol L^-1 Morin. The calibration graph is linear up to 7 mg L^-1 and the detection limit is 0.022 mg L⁻¹. The relative standard deviation is 1.81% for Al(III) at 5 mg L^-1. It was found that Zn(II) and F^- produced highest interference.

 

Keywords:  aluminum determination, fluorescence analysis, non-ionic surfactants, Triton X-100, Morin

 

Abstrak

Satu kaedah penentuan Al(III) secara spektrofluorimetri yang mudah dan sensitif berasaskan kepada pembentukan kompleks ternari Al-Morin-Triton X-100 dilaporkan. Kesan beberapa surfaktan tak-ionik yang lain seperti Tween 20, Tween 80 dan ositilglukos (OG) terhadap analisis berpendarflour turut dikaji. Penambahan Triton X-100 telah membolehkan penentuan secara pendarflour Al(III) dijalankan sehingga kepada kuantiti submikrogram. Kompleks teruja pada 410 nm dan isyarat pendarflour diukur pada 495 nm. Isyarat pendarflour maksimum dihasilkan pada pH 4.0 (menggunakan penimbal asetik asid-asetat), dengan 0.6% Triton X-100 dan 1.35 x 10^-3 mol L^-1 morin. Graf kalibrasi adalah linear sehingga 7 mg L^-1 dan had pengesanan pula adalah 0.022 mg L⁻¹. Sisihan piawai relatif bagi penentuan 5 mg L^-1 Al(III) ialah 1.81%. Didapati juga ion Zn(II) dan F^- menghasilkan gangguan bacaan yang tertinggi.

 

Kata Kunci:  penentuan aluminum, analisis fluorimetrik, surfaktan tak-ionik, Triton X-100, Morin

 

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