Quantification of Heavy Metals (Pb2+, Zn2+, Cd2+) by Square Wave Voltammetry through  Anodic Re-dissolution in Landfill Leachate

Larissa Souza Fernandes; Juacyara Carbonelli Campos; Rodrigo de Siqueira Melo

doi:10.18540/jcecvl11iss1pp21506

Authors

Larissa Souza Fernandes Inorganic Processes Department, School of Chemistry, Federal University of Rio de Janeiro, Brazil https://orcid.org/0009-0006-4024-7026
Juacyara Carbonelli Campos Inorganic Processes Department, School of Chemistry, Federal University of Rio de Janeiro, Brazil
Rodrigo de Siqueira Melo Multidisciplinary Institute of Chemistry, Multidisciplinary Center UFRJ-Macaé, Federal University of Rio de Janeiro, Brazil https://orcid.org/0009-0000-9961-9740

DOI:

https://doi.org/10.18540/jcecvl11iss1pp21506

Keywords:

Chemical precipitation, Heavy metals, Leachate, Square wave voltammetry, Removal efficiency

Abstract

The rapid increase in waste production, driven by the Industrial Revolution, has led to significant environmental challenges, particularly the contamination of soil and water from landfill leachate. This study aims to evaluate the removal of heavy metals (zinc, cadmium, and lead) from landfill leachate through chemical precipitation using the analytical technique of square wave voltammetry by anodic re-dissolution. The study involved sequential stages, starting with adjustments to the electroanalytical method and calibration curve development, followed by precipitation assays with a synthetic metal solution to optimize variables for heavy metal removal. Precipitation experiments were conducted using zinc, cadmium, and lead ions with calcium hydroxide and sodium carbonate, and voltammetric analyses were performed using square wave anodic stripping voltammetry to assess metal concentrations. The study examined the electrochemical behavior of Bi³? using square wave voltammetry, revealing linear relationships between peak current and frequency, indicating reversibility in the reaction. Optimization of parameters such as frequency, step, and pulse amplitude improved the precision and selectivity of the analysis. Bi³? concentration was optimized for maximum electroanalytical response, with a concentration of 1.25 mg L?¹ selected. Deposition time was also optimized, with 300 seconds providing the best results. Metal removal efficiency using precipitating agents (Ca(OH)? and Na?CO?) was analyzed, showing higher efficiency for lead and cadmium with Ca(OH)?. The study highlights the significance of pH and agent concentration in the removal process. This study evaluated the removal of heavy metals (zinc, cadmium, and lead) from landfill leachate using chemical precipitation with calcium hydroxide and sodium carbonate. The process achieved high removal rates, particularly for lead (97.97%). Square wave voltammetry was successfully developed for precise quantification, with statistical validation confirming its reliability for this application.

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References

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