Journal of Analytical & Bioanalytical Techniques
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The simultaneous determination of Cd (II), Pb (II), Cu (II), and Hg (II) ions is performed with a disposable screen print
carbon electrode (SPCE) modified with a mixture of 3,4-diamine-5:2,5:2-terthiophene (DATT) and graphene oxide (GO).
The surface of the modified electrode was characterized with impedance spectroscopy and SEM, and XPS. Experimental
variables that affect response signal, such as pH, deposition time, DATT concentration, Nafion? concentration, and GO
to DATT ratio were optimized. Interference effects of other heavy metal ions were also tested at various electrolytes. The
heavy metal ions are pre-concentrated on the GO-DATT layer by means of complex formation reaction firstly, then electro-
deposited. Square wave anodic stripping voltammetry (SWASV) was performed to simultaneously analyze the heavy metal
ions by sweeping the potential between -1.3 and +0.5 V after pre-concentration in an acetate buffer solution. Calibration plots
using DATT-GO/ Nafion? modified SPCE were obtained for the ions in the concentration range from 0.5ppb to 5ppm. The
detection limits for Cd (II), Pb (II), Cu (II), and Hg (II) ions were determined to be ~0.1 ppb.
Seung-Min Choi received his Bachelor degree in 2014 from the Pusan National University and now he is a Master student in the same University. His research
interests include heavy metal ions sensors for chemical and environmental applications.
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