Simultaneous determination of trace aluminum (III), copper (II) and cadmium (II) in water samples by square-wave adsorptive cathodic stripping voltammetry in the presence of oxine

Abstract

A validated adsorptive cathodic stripping voltammetry method is described for simultaneous determination of Al(III), Cu(II) and Cd(II) in water samples. In acetate buffer (pH 5) containing 10 lM oxine, these metal ions were determined as oxine complexes following adsorptive accumulation onto the HMDE at -0.05 V versus Ag/AgCl/KCl s . The best signal to noise ratio was obtained using a square wave of scan increment 10 mV, frequency 120 Hz, and pulse-amplitude 25 mV. Limits of detection as low as 0.020 lg L -1 Al(III), 0.012 lg L -1 Cu(II) and 0.028 lg L -1

Colorimetric sensing of copper(II) based on catalytic etching of gold nanoparticles

“…The concentration of Cu 2+ in drinking water, as recommended by U.S. Environ mental Protection Agency (EPA), should be lower than 1.3 mg/kg (∼20 μM) [2]. The detection of Cu 2+ at such a level or the even lower level, honestly speaking, could be simply achieved in the laboratory by means of mass spectrometry [3], atomic spectroscopy [4], voltammetry [5], etc. However, due to the dependence on sophisticated instruments or the lack of selectivity, none of them could be simplified for the rapid onsite detection of Cu 2+ in environmental waters.…”

Quantification of Sub‐Nanomolar Levels of Aluminum by Adsorptive Stripping Voltammetry Using Rubeanic Acid as a Selective Chelating Agent

“…Recently a few AdSV procedures have been reported for the determination of aluminum using different complexation agents such as: 1,2-dihydroxyantraquinone-3-sulfonic acid (DASA) [17,25,26], cupferron [18,19,22], solochrome violet R S [20], arsenazoIII [21], quinolin-8-ol [23], alizarin S [24] and oxine [27]. However, the reported methods suffer from limitations such as interferences from commonly associated ions [21,23,[25][26][27], high limit of detection [5,10] narrow linear range [8,10] and long accumulation time [6]. The aim of this study is to obtain sensitive, selective and simple method for determination of aluminum ions based on differential pulse cathodic adsorptive stripping voltammetry in the present of dithiooxamide.…”

Direct Determination of Cadmium Traces in Natural Water by Adsorptive Stripping Voltammetry in the Presence of Cupferron as a Chelating Agent

“…Primary predominance of adsorptive stripping voltammetry (AdSV) over ASV is a potentiality to obtain lower limit detection. Only several procedures within the last 15 years have been reported for the determination of cadmium by AdSV using different complexing agents [19][20][21][22][23][24][25][26].This paper describes a novel adsorptive stripping voltammetric procedure for the determination of traces of cadmium in natural water in the presence of cupferron as a complexing ligand. Cupferron is a commonly used organic compound which can form stable complexes with many metal elements [27-31].…”