How to Determine Uranium Faster and Cheaper by Adsorptive Stripping Voltammetry in Water Samples Containing Surface Active Compounds

Abstract

A modification of the voltammetric procedure for the determination of uranium in the presence of cupferron using hanging mercury drop electrode is presented. The pulsed potential accumulation was proposed for the minimization of interferences of surface active substances. The calibration plot for U(VI) in the presence of 2 ppm Tritonu X-100 was linear from 1.7 10 À10 to 2.0 10 À8 mol L À1 for an accumulation time of 60 s, with correlation coefficient of 0.996. The application of this method was tested in the determination of uranium in certified reference material NASS-5 and river water samples.

Simultaneous voltammetric determination of trace bismuth(III) and cadmium(II) in water samples by adsorptive stripping voltammetry in the presence of cupferron

“…Cupferron is widely used in analytical chemistry forming stable complexes with a lot of metals which willingly adsorb onto the mercury electrode. We can find numerous adsorptive stripping procedures which employ cupferron as a complexing agent for sensitive determinations of many metals, such as aluminum [34,35], chromium [36,37], copper [38], vanadium [39], titanium [40], europium [41], molybdenum and uranium [42][43][44].…”

Simultaneous quantification of Bi(III) and U(VI) in environmental water samples with a complicated matrix containing organic compounds

“…A previous study has shown that U(VI) and Bi(III) form electrochemically active stable complexes with cupferron, which makes voltammetric determination of these elements with a low detection limit possible (Kefala et al 2006; Korolczuk et al 2007; Grabarczyk and Koper 2011a, b; Koper and Grabarczyk 2011). The proposed procedure concentrated on the selection of optimum conditions for the simultaneous determination of uranium and bismuth in one voltammetric scan.…”

“…As a supporting electrolyte, an acetate buffer was chosen on the basis of literature data (Korolczuk et al 2007; Grabarczyk and Koper 2011a, b; Koper and Grabarczyk 2011) as the most suitable both for U(VI)–cupferron and Bi(III)–cupferron complex formation and accumulation on the working electrode. The pH of the supporting electrolyte was changed from 3 to 6, and its influence on uranium and bismuth peak currents is presented in Fig.…”

“…In order to reduce these interferences, addition of the Amberlite XAD-7 resin (Grabarczyk and Koper 2011a, b; Koper and Grabarczyk 2011) or pulsed potential accumulation (Grabarczyk and Koper 2011a, b) was proposed. In this work, the addition of Amberlite XAD-16 resin was proposed for the elimination of the interference of organic substances.…”

Rapid Determination of Uranium in Water Samples by Adsorptive Cathodic Stripping Voltammetry Using a Tin-Bismuth Alloy Electrode

“…It was also observed that major sources of interferences in U(VI)-cupferron complex current were likely to be the nonionic surfactants such as Triton X-100, which can cause a 55% decay of the UO 2 2+ peak at the concentration of 2 mg L À1 . Considering the fact that natural water samples typically contain surfactants similar to 0.01-2 mg L À1 of Triton X-100 [60,61], it can be assured that the proposed method in The inset is the fitted curve of UO 2 2+ measurement obtained from standard addition.…”