Adsorptive Stripping Voltammetric Determination of Copper(II) Ion Using Phenyl Pyridyl Ketoneoxime (PPKO)

Abstract

A sensitive and selective procedure is presented for the voltammetric determination of copper(II) ion. The procedure involves an adsorptive accumulation of Cu2+-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 microgM 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.

Cloud point extraction for the determination of copper, nickel and cobalt ions in environmental samples by flame atomic absorption spectrometry

“…1 show that type and percent of major form of complexes has strong dependency to pH. According to our previous publication [37] using of the Best program [38] following the pH measurement, speciation of different possible forms of complexes between ligand and analyte ions and evaluating the dissociation constant of ligand and the stability constant of its complexes with analyte ions were exam- Fig. 1.…”

“…The pH measurement method for speciation of different forms of complexes between copper, nickel and cobalt ions and MPKO were carried out according to our previous publication [37]. Each time, two separate solutions were prepared as follows: the first solution contains 7 mL 0.…”

Variation characteristics and ecological risk of heavy metals in the south Yellow Sea surface sediments

“…Sediments, which play both the source and sink roles, are very important in evaluating the pollution level of heavy metals (Song 1997). In order to understand and protect aquatic community, comprehensive methods for identifying and assessing the severity of sediment contamination have been introduced over the past 20 years (Chapman et al 1999;Ghaedi et al 2005aGhaedi et al , b, 2008. Many studies have focused on distributions, interrelated controlling factors (Li 2000Tanner et al 2000;Sari and Cagatay 2001;Lin et al 2002;Liu et al 2003;Carman et al 2007), and long time-scale variation trends according to the 210 Pb dating method (Yang et al 2004) in surface sediments and sediment cores.…”

Cloud point extraction for the determination of copper in environmental samples by flame atomic absorption spectrometry

“…For this reason, several methods for the determination of copper ion are available for copper ion determination. 1,2 The determination of trace copper in biological samples is particularly difficult because of the complex matrix and the usually low concentration of copper, which requires sensitive instrumental techniques and frequently a pre-concentration step. [3][4][5][6] Micelles and other organized amphiphilic assemble are increasingly utilized in analytical chemistry especially in separation and preconcentration procedures.…”