A Lead Film Electrode for Adsorptive Stripping Voltammetric Analysis of Ultratrace Tungsten(VI) in Acidic Medium

Abstract

For the first time an in situ plated lead film electrode was applied to adsorptive stripping voltammetry at relatively strong acidic conditions of, e.g., pH 2. As an example of the application of such electrode a procedure for ultratrace W(VI) determination by adsorptive stripping voltammetry was elaborated. The procedure is based on the preconcentration of the W(VI)-Alizarin Red S complex at an in situ plated lead film electrode held at À0.575 V (vs. Ag/ AgCl), followed by a negatively sweeping square wave voltammetric scan. The proposed voltammetric procedure was applied to W(VI) determination in natural water samples.

3,5-Dihydroxy Benzoic Acid-Capped CaF2:Tb3+ Nanocrystals as Luminescent Probes for the WO42– Ion in Aqueous Solution

“…The calculated LOD value is about 0.41 ± 0.01 μM. The calculated LOD of WO 4 2– ions using our method is comparable with that of other available methods (see Table S1) reported in the literature. ,,,− …”

Post‐Transition Metal Electrodes for Sensing Heavy Metal Ions by Stripping Voltammetry

“…[143] Furthermore, the in situ plated Pb film was applied in AdSV for detecting tungsten species (W(VI)) for which a linear curve from 2 × 10 −11 to 2 × 10 −9 mol L −1 was obtained with a 1.47 × 10 −3 ppb detection limit. [144] Furthermore, an in situ Pb film deposited on glassy carbon electrode was applied for the sensing of platinum (Pt) species, (Figure 7B) under optimum experimental parameters, ranging from 2 × 10 −11 to 5 × 10 −10 mol L −1 , offering a detection limit of 1.79 × 10 −3 ppb for Pt(IV). [145] The in situ plated Pb film electrode could be also utilized to detect Ga(III) by AdCSV, for which a linear sensing profile ranging from 1 × 10 −8 to 2 × 10 −7 mol L −1 was reported with a detection limit of 0.209 ppb, which was relatively higher than that of a hanging Hg drop electrode from previous reports.…”

“…In situ Pb film plated on glassy carbon electrode [144] W(VI): 1.47 In situ Pb film plated on glassy carbon electrodes [72,145] Pt(IV): 1.79 × 10 −3 Water samples Pt(IV): 2 × 10 −11 to 5 × 10 −10 m SWAdSV, pH: 3.5, complexing agent: formaldehyde, E d and t d : −1.2 V for 30 s and −0.9 V for 60 s, E step : 25 mV, scan rate: 10 mV s −1…”

Voltammetric determination of platinum at a lead film electrode in environmental water samples

“…Since their first application, lead film electrodes deposited on glassy carbon have been successfully used for determination of selected heavy metals, such as Ni(II), Co(II), U(VI), Mo(VI) and W(VI) (Korolczuk et al 2005;Korolczuk et al 2007;Tyszczuk and Korolczuk 2008;Tyszczuk-Rotko and Maj 2012). It has to be noted that lead and lead salts are much less volatile and less toxic than mercury and mercury salts used for preparation of electrodes (Bobrowski et al 2014).…”