Malaysian Journal of Analytical Sciences Vol 19 No 2 (2015): 309 – 317

 

 

 

DIFFERENTIAL PULSE ANODIC STRIPPING VOLTAMMETRY DETERMINATION OF COPPER (II) AT GLASSY CARBON ELECTRODE IN THE PRESENCE OF BIS(BENZYLIDENE)ETHYLENEDIAMINE AS A NOVEL COMPLEXING AGENT

 

(Penentuan Kuprum(II) Menggunakan Voltammetri Perlucutan Anodik Denyut Pembezaan Dengan Elektrod Karbon Berkaca Serta Kehadiran Bis(Benzilidina)Etilinadiamina Sebagai Agen Pengkompleks)

 

Syaza Azhari, Rahmalan Ahamad*, Farediah Ahmad

 

Department of Chemistry, Faculty of Science,

Universiti Teknologi Malaysia, 81310 UTM Skudai, Johor, Malaysia

 

*Corresponding author: rahmalan@utm.my

 

 

Received: 6 November 2014; Accepted: 5 January 2015

 

 

Abstract

This paper reports on the application of synthesized Schiff base bis(benzylidene)ethylenediamine (BBE) to increase the detection sensitivity of copper (II) at 0.01 V vs Ag/AgCl using glassy carbon electrode. Aliquot of 2.0×10^-3 M of BBE in DMF solution containing BR buffer pH 6 was introduced into the voltammetric cell followed by the addition of Cu(II) ions and then further proceeded to differential pulse anodic-stripping scan from -1.4 V to +0.3 V vs Ag/AgCl. The optimum parameters obtained were; scan rate; 25 mV/s, accumulation time; 200 sec and accumulation potential; -0.6 V. Under the optimal conditions, the detection limit of 0.4 µgL⁻¹ and a linear response in the range of 1-10 µgL⁻¹ were obtained. The effects of interfering ions such as Cd(II), Cr(III), Fe(II), Pb(II) and Zn(II) were also investigated. The practical applicability of this technique was illustrated by the determination of Cu(II) ions at 3µgL^-1 concentration level in tap water with 94.43% of recovery.

 

Keywords: bis(benzylidene)ethylenediamine, copper ion, differential pulse anodic stripping voltammetry

 

Abstrak

Kertas ini melaporkan aplikasi sintesis Schiff base bis(benzilidena)ethylenadiamina (BBE) untuk meningkatkan kepekaan pengesanan kuprum(II) pada 0.01 V vs Ag/AgCl dengan menggunakan electrod karbon berkaca.  Alikuot BBE (2.0 x10^-3 M) dalam DMF dimasukkan ke dalam sel voltammetri yang mengandungi larutan buffer BR pada pH 6. Larutan Cu(II) kemudian ditambah dan di imbas menggunakan teknik voltammetri pelucutan anodik denyut pembezaan dari -1.4 V kepada +0.3 V vs Ag/AgCl. Parameter optimum ialah, kadar imabasan 25 mV/s, masa pengumpulan 200 saat dan keupayaan pengumpulan -0.6 V. Dibawah kondisi optimum ini, had pengesanan ialah 0.4 ugL^-1 dan julat linear yang diperolehi ialah 1-10 ugL^-1. Kesan ion–ion lain seperti Cd(II), Cr(III), Fe(II), Pb(II) dan Zn(II) juga dikaji. Kaedah ini telah diaplikasikan bagi menentukan Cu(II) pada kepekatan 3ugL^-1 dalam air paip dengan perolehan semula sebanyak 94.43%.

 

Kata kunci: Bis(benzylidene)ethylenediamine, ion kuprum, voltammetri pelucutan anodik denyut pembezaan

 

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