A voltammetric approach to the quantification of tungsten in environmental waters using a solid bismuth microelectrode

Adamczyk, Marzena; Grabarczyk, Malgorzata; Leszko, Weronika

doi:10.1016/j.measurement.2022.111089

Cited by 4 publications

(6 citation statements)

References 36 publications

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“…Our preliminary measurements showed that the previously proposed solid bismuth microelectrode [42][43][44][45][46] could be used to determine low selenium concentrations by differential pulse cathodic stripping voltammetry (DPCSV) in aqueous samples under field conditions. As in previous works, the working microelectrode was subjected to a short electrochemical activation process at a potential of −2.5 V for 2 s, during which, as mentioned earlier, bismuth oxides that may form on the electrode surface are reduced to a metallic form.…”

Section: Preliminary Studiesmentioning

confidence: 99%

“…In all procedures in which a solid bismuth microelectrode was used as a working electrode, the best voltammetric response of this electrode was achieved in an acidic medium, provided mainly by acetate buffers of various pHs, most frequently a pH equal to 4.6 [42,43,45], and in one case, acetic acid [43]. The impact of pH on the microelectrode performance in the current work was consequently studied by using acetic acid (pH = 2.88) as an initial solution, whose pH was gradually increased to 5.0 by putting in place aliquots of NaOH (2 mol L −1 ) to the voltammetric cell.…”

Section: The Effect Of Supporting Electrolyte Compositionmentioning

confidence: 99%

“…A more favorable signal-to-noise ratio is another issue that distinguishes miniaturized sensors from larger ones, due to the reduction of capacitive current in these sensors to the minimum. All the above advantages are provided by the recently developed solid bismuth microelectrode that has so far been applied for the determination both of organic compounds (folic acid) [40] and inorganic ions (Tl(I), W(VI), Sn(II) and Ga(III)) [41][42][43][44] in different water samples. In these studies, the accumulation of the analyte to be determined was carried out directly on the solid bismuth microelectrode without bringing in any additional modifiers.…”

Section: Introductionmentioning

confidence: 99%

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Microelectrode Voltammetric Analysis of Low Concentrations of Se(IV) Ions in Environmental Waters

Grabarczyk,

Fialek

2024

Molecules

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The current research is an attempt to analyze on-site selenium(IV) ions in environmental water samples using an eco-friendly miniaturized sensor developed by deposition of a very thin amount of metallic bismuth in a solid Bi electrode tightly closed in miniaturized housing. Numerous experimental variables are optimized, including the composition of the supporting electrolyte and its pH, as well as activation and accumulation conditions. Under optimized measurement conditions, the method shows high sensitivity, permitting a very low limit of detection equal to 7 × 10−10 mol L−1 to be achieved in a short accumulation time of 50 s. The performance of this microsensor was investigated against numerous interference factors and its good anti-interference capability was demonstrated. A series of voltammetric experiments were carried out and they proved that the miniaturized sensor is characterized by very good accuracy and precision as well as long-term stability. The solid bismuth microelectrode displays a good voltammetric response in the analysis of diverse samples with a complex matrix and demonstrates a good recovery rate.

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Section: Preliminary Studiesmentioning

confidence: 99%

Section: The Effect Of Supporting Electrolyte Compositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microelectrode Voltammetric Analysis of Low Concentrations of Se(IV) Ions in Environmental Waters

Grabarczyk,

Fialek

2024

Molecules

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“…A gradual increase in the cadmium signal was seen as the accumulation time increased to 50 s, but the cadmium peak current did not increase further above this time. Based on previous experience [44,45], it was observed that a favorable effect on increasing the signal size of the analyte being determined could be achieved, when using metallic film electrodes created in situ, by applying a high negative potential to the electrode for several seconds before the accumulation step. Thus, it was investigated whether and to what extent application of a more negative potential (activation potential) to the CNTs/SGC electrode directly before the potential accumulation step would enhance the cobalt signal on the voltamperogram.…”

Section: Studies Of Accumulation Potential and Timementioning

confidence: 99%

An Electrochemical Sensor for the Determination of Trace Concentrations of Cadmium, Based on Spherical Glassy Carbon and Nanotubes

et al. 2023

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The practical application of a novel, eco-friendly electrochemical sensor based on low-dimensional structures, spherical glassy carbon microparticles, and multiwall carbon nanotubes is described. This sensor, modified with a bismuth film, was used for the determination of Cd(II) by the anodic stripping voltammetric method. The instrumental and chemical factors influencing the sensitivity of the procedure were thoroughly investigated and their most favorable values were selected (acetate buffer solution pH = 3 ± 0.1; 0.15 mmol L−1 Bi(III); activation potential/time: −2 V/3 s; accumulation potential/time: −0.9 V/50 s). Under the selected conditions, the method exhibited linearity in the range of 2 × 10−9 to 2 × 10−7 mol L−1 Cd(II) with a detection limit of 6.2 × 10−10 mol L−1 Cd(II). The results obtained also showed that the application of the sensor for Cd(II) detection did not experience any significant interference in the presence of a number of foreign ions. The applicability of this procedure was evaluated using TM-25.5 Environmental Matrix Reference Material and SPS-WW1 Waste Water Certified Reference Material as well as river water samples through addition and recovery tests.

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“…Amberlite XAD-7 resin is a polymeric sorbent derived from acrylic esters, which can sorb hydrophobic compounds from water as well as hydrophilic compounds from organic solvents and is used to purify water from organic pollutants (dyes, pesticides, and detergents) [17]. Therefore, It is not surprising that this method of reducing interference related to the presence of surfactants has been used in the voltammetric analysis of many elements [18][19][20][21][22]. The main difficulty is to select appropriate conditions, mainly the composition and pH of the basic electrolyte, to ensure the highest possible efficiency in the adsorption of surface-active substances on the resin and at the same time prevent the adsorption of metal ions on the resin in such conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature on the Removal of Interferences in the Voltammetric Procedure for the Determination of Cr(VI)

Grabarczyk,

Wardak

2024

Materials

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The aim of this paper was to investigate the effect of temperature on the removal efficiency of surfactant-induced interferences. Surfactants were removed as a result of mixing with XAD-7 resin. The study was carried out using the example of Cr(VI) determination by adsorption stripping voltammetry (AdSV). Measurements were carried out using a solution containing Cr(VI), acetate buffer (pH = 6.2), DTPA, KNO3, and different surfactants. Ten mL of the solution was mixed with 0.5 g of XAD-7 resin at different temperatures for 5 min prior to voltammetric measurement. The effect of the mixing temperature of the sample with the resin on the voltammetric Cr(VI) signal in the presence of different surfactants was studied in the range from 20 to 60 °C. The proposed method of removing interference from surfactants by mixing the sample with the XAD-7 resin at 60 °C was used for the determination of trace amounts of Cr(VI) in river water containing non-ionic, anionic, cationic surfactants, and biosurfactants.

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A voltammetric approach to the quantification of tungsten in environmental waters using a solid bismuth microelectrode

Cited by 4 publications

References 36 publications

Microelectrode Voltammetric Analysis of Low Concentrations of Se(IV) Ions in Environmental Waters

Microelectrode Voltammetric Analysis of Low Concentrations of Se(IV) Ions in Environmental Waters

An Electrochemical Sensor for the Determination of Trace Concentrations of Cadmium, Based on Spherical Glassy Carbon and Nanotubes

Effect of Temperature on the Removal of Interferences in the Voltammetric Procedure for the Determination of Cr(VI)

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