Malaysian Journal of Analytical Sciences Vol 21 No 4 (2017): 784 - 792

DOI: https://doi.org/10.17576/mjas-2017-2104-04

 

 

 

OPTICAL CHEMICAL SENSOR OF Cd(II) IN WATER BASED ON 1-(2-PYRIDYLAZO)-2-NAPHTOL IMMOBILIZED ON

POLY(METHYL METHACRYLATE) AND 2-NITROPHENYL OCTYL ETHER MATRIX

 

(Sensor Kimia Optik untuk Penentuan Cd(II) dalam Air Berasaskan 1-(2-Piridilazo)-2-Naftol yang Dipegun dalam Matriks Poli(metil metaakrilat) dan 2-Nitrofenil Oktil Eter)

 

Moersilah1,2, Dwi Siswanta1, Roto Roto1, Mudasir Mudasir1*

 

1Department of Chemistry, Faculty of Mathematics and Natural Sciences,

Universitas Gadjah Mada, Sekip Utara, Yogyakarta, 55281 Indonesia

2Department of Chemistry, Faculty of Mathematics and Science,

State University of Jakarta, Jl. Pemuda No. 10 Jakarta Timur, Jakarta, Indonesia

 

*Corresponding author: mudasir@ugm.ac.id

 

 

Received: 18 January 2017; Accepted: 22 May 2017

 

 

Abstract

An optical chemical sensor for determination of Cd(II) in aqueous solution has been developed by immobilizing 1-(2-pyridylazo)-2-naphtol (PAN) in poly(methyl methacrylate) (PMMA) as a matrix and 2-nitrophenyl octyl ether (NPOE) as a plasticizer. The adsorption of Cd(II) causes the color of the membrane to change from yellow to red-orange with the maximum absorbance (λmax) at 556 nm. The sensor membrane gives the best response towards Cd(II) ion at pH 8.5,  after 120 minutes of contact time, at 2 ppm Cd(II), and 2 mL solution. A linear Cd(II) calibration curve can be developed in the concentration range of 0.8 - 1.8 ppm with R2 = 0.960. The limit of the detection and limit of quantification are 0.041 ppm and 0.126 ppm, respectively. The molar absorptivity is found to be 2.3 x 105 L mol-1 cm-1.  The proposed sensor membrane has been applied to the determination of Cd(II) in the river water with internal standard addition method. The observed percent recovery is in the range of 100.24 – 107.52%.

 

Keywords:  optical chemical sensor, 1-(2-pyridylazo)-2-naphtol, Cd(II) analysis,  poly(methyl methacrylate)

 

Abstrak

Reagen 1-(2-piridilazo)2-naftol (PAN) yang dipegun dalam poli(metil metaakrilat) (PMMA) dengan 2-nitrofenil oktil eter (NPOE) sebagai pemplastik untuk sensor kimia optik bagi penentuan ion Cd(II) dalam larutan akues telah dibangunkan. Jerapan ion Cd(II) telah menyebabkan penukaran warna dari kuning menjadi merah-oren dengan serapan maksimum pada (λmax) iaitu 556 nm. Membran sensor memberikan tindak balas maksimum apabila dicelupkan dalam larutan Cd(II) pada pH 8.5, selepas 120 minit masa sentuhan pada kepekatan 2 ppm Cd(II) dan 2 ml isipadu larutan. Berdasarkan kajian yang dijalankan, julat linear lengkung kalibrasi kepekatan ion Cd(II) ialah 0.8 - 1.8 ppm dan nilai R2 = 0.960. Had pengesanan dan pengkuantitian yang diperolehi masing – masing ialah 0.041 ppm dan 0.126 ppm. Daya penyerapan molar dikira pada 2.3 x 105 L mol-1 cm-1. Membran sensor ini telah dikaji untuk menentukan kepekatan Cd(II) dalam air sungai yang dipaku kaesah larutan piawai dalam. Ia telah menghasilkan pemulihan semula pada nilai 100.24 – 107.52%.

 

Kata kunci: Sensor kimia optik, 1-(2-piridilazo)2-naftol, analisis Cd(II), poli(metil metaakrilat)

 

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