Adsorptive Stripping Voltammetric Determination of Copper(II) Ion Using Phenyl Pyridyl Ketoneoxime (PPKO)
✍ Scribed by Mehrorang Ghaedi; Mohammad K. Amini; Ali Rafi; Shiva Gharaghani; Ardashir Shokrollahi
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 113 KB
- Volume
- 95
- Category
- Article
- ISSN
- 0003-4592
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✦ Synopsis
A sensitive and selective procedure is presented for the voltammetric determination of copper(II) ion. The procedure involves an adsorptive accumulation of Cu 2+ -PPKO on a hanging mercury drop electrode, followed by a stripping voltammetric measurement of reduction current of adsorbed complex at about -0.30 V (vs. SCE). The optimum conditions for the analysis of copper(II) ion include pH (5.8-7.0), 60 µM PPKO and an accumulation potential of -0.5 V (vs. SCE). The peak current is proportional to the concentration of copper over the range 0.3-76 ng mL -1 with a detection limit of 0.01ng mL -1 with an accumulation time of 60 s. The speciation of different forms of complex between copper(II) ion and PPKO, using the Best (Martell program), followed pH measurement were examined. The method was applied to the determination of copper(II) ion content in real samples successfully.
2 0.0 Current (µΑ) -0.5 -0.4 -0.3 -0.2 -0.1 0.0 Cu 2+ Cu 2+ -PPKO PPKO FIG.2 -Differential pulse voltammogram of the Cu 2+ -PPKO complex, conditions: DP mode, 60 s accumulation of 33 ng mL -Cu 2+ at -0.5 V in the presence of 60 µM PPKO at pH=6.0, scan rate 80.0 mV/s.