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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