Malaysian Journal of Analytical Sciences Vol 20 No 1 (2016): 197 -
204
DITHIZONE MODIFIED SILVER ELECTRODE
FOR THE DETERMINATION OF METAL IONS IN AQUEOUS SOLUTION
(Elektrod
Perak Diubahsuai Ditizon bagi Penentuan Ion Logam dalam Larutan Akues)
Mohamad Aiman Firdaus Othman, Azrilawani
Ahmad @ Othman, Hafiza Mohamed Zuki*
School of Marine Science and
Environment,
Universiti
Malaysia Terengganu, 21030, Kuala Terengganu, Malaysia
*Corresponding author: hafiza@umt.edu.my
Received: 9
December 2014; Accepted: 16 October 2015
Abstract
Dithizone-PVC membrane was constructed
and utilized as an ionophore reagent material for chemically modified silver
(Ag) electrode. The modified electrode was characterized using cyclic
voltammetry where the electrochemical behaviour of dithizone modified Ag
electrode surface was investigated in the range of -0.6 to +0.6 V with 0.1 M
KCl as supporting electrolyte. Comparative studies towards metal ions Cu2+,
Fe2+ and Pb2+ exhibited good responses for redox
reactions with linear relationship between peak currents and concentrations.
The correlation coefficients obtained were 0.9800, 0.9944 and 0.9949 while the
evaluated limits of detection were 8.3 x 10-7 M, 4.7 x 10-7
M and 7.6 x 10-7 M respectively.
Keywords:
PVC membrane, dithizone (1,5-diphenylthiocarbazone), cyclic voltammetry, redox reactions
Abstrak
Membran PVC-Ditizon telah dibina dan digunakan
sebagai bahan reagen ionofora bagi elektrod perak (Ag) yang diubahsuai secara
kimia. Elektrod yang diubahsuai telah dicirikan menggunakan voltametri berkitar
di mana sifat elektrokimia bagi ditizon yang diubahsuai pada permukaan elektrod
Ag telah dikaji di dalam julat -0.6 ke +0.6 V dengan 0.1 M KCl sebagai
elektrolit sokongan. Kajian perbandingan terhadap ion-ion logam Cu2+,
Fe2+ dan Pb2+ mempamerkan respon yang baik bagi tindak
balas redoks dengan hubungan linear antara arus-arus puncak dan kepekatan.
Pekali korelasi yang diperolehi adalah 0.9800, 0.9944 dan 0.9949 manakala had
pengesanan yang diukur adalah 8.3 x 10-7 M, 4.7 x 10-7 M
dan 7.6 x 10-7 M masing-masing.
Kata kunci: membran
PVC, ditizon (1,5-difeniltiokarbazon), voltametri berkitar, tindakbalas redoks
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