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. 2023 Jan 17;23(3):1084.
doi: 10.3390/s23031084.

Electrochemical System for Field Control of Hg2+ Concentration in Wastewater Samples

Anda-Gabriela Tenea  1   2 , Cristina Dinu  1 , George-Octavian Buica  3 , Gabriela-Geanina Vasile  1
Affiliations

Electrochemical System for Field Control of Hg2+ Concentration in Wastewater Samples

Anda-Gabriela Tenea et al. Sensors (Basel). .

Abstract

The paper presents the validation of an electrochemical procedure for on-site Hg2+ ions determination in wastewater samples using a modified carbon screen-printed electrode (SPE) with a complexing polymeric film based on poly(2,2'-(ethane-1,2-diylbis((2-(azulen-2-ylamino)-2-oxoethyl)azanediyl))diacetic acid) (polyL). Using metal ions accumulation in an open circuit followed by anodic stripping voltammetry, the SPE-polyL electrode presents a linear range in the range of 20 µg/L to 150 µg/L, with a limit of detection (LOD) = 6 µg/L, limit of quantification (LOQ) = 20 µg/L, and an average measurement uncertainty of 26% of mercury ions. The results obtained in situ and in the laboratory using the SPE-polyL modified electrode were compared with those obtained by the atomic absorption spectrometry coupled with the cold vapor generation standardized method, with the average values indicating excellent recovery yields.

Keywords: carbon screen-printed modified electrode; electrochemical detection; mercury; wastewater analysis.

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Conflict of interest statement

The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.

Figures

Figure 1
Figure 1
The structure of (2,2′-(ethane-1,2-diylbis((2-(azulen-2-ylamino)-2-oxoethyl)azanediyl))diacetic acid, (L).
Figure 2
Figure 2
Principle scheme for the realization of the electrochemical process for the determination of Hg2+ ions in wastewater: 1—electrode with deposited polymer; 2—electrochemical cell with 20 mL 0.05 M acetate buffer solution at pH = 3; 3—magnetic stirrer; 4—Teflon magnet; 5—electrode with complexed Hg2+ ions and uncomplexed Hg2+ ions; 6—three electrical contacts; 7—electrode with complexed Hg2+ ions; 8—electrochemical cell; 9—portable potentiostat; 10—laptop with installed software.
Figure 3
Figure 3
Linear regression curve for Hg(II) through the DPV technique with SPE-polyL.
See this image and copyright information in PMC

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