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<p>Pb<sup>2+</sup>, widely acknowledged as a harmful pollutant in aquatic environments, was accurately quantified using a Mn-MoS<sub>2</sub>/Nafion-modified electrode integrated with an advanced electrochemical flow cell. We elucidated the mechanisms responsible for the signal enhancement observed during Pb<sup>2+</sup> detection. Through rigorous experimentation and analysis, we achieved a limit of detection (3σ/slope) of 0.58&#xa0;μg L<sup>−1</sup> across a broad concentration range from 2 to 100&#xa0;μg L<sup>−1</sup>. Our comprehensive evaluations encompassed not only critical accuracy assessments but also involved thorough tests to examine anti-interference capabilities and reproducibility. The stability of the system was carefully assessed by conducting twenty consecutive tests at a Pb<sup>2+</sup> concentration of 20&#xa0;μg L<sup>−1</sup> with a RSD of 1.23%. Ultimately, we successfully employed the Mn-MoS<sub>2</sub>/Nafion-modified electrode for continuous monitoring of Pb<sup>2+</sup> concentrations in water alongside the electrochemical flow cell system, and the recovery rates ranged impressively from 99.5 to 106%. This innovative approach demonstrates significant potential for real-time determination of heavy metal ions, thereby paving new avenues in environmental monitoring and analysis.</p>

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Determination of Pb2+ in water using Mn-doped MoS2/Nafion electrode coupled with an electrochemical flow cell

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Zhiwei Lai,
  • Cuiyun Zhang

摘要

Pb2+, widely acknowledged as a harmful pollutant in aquatic environments, was accurately quantified using a Mn-MoS2/Nafion-modified electrode integrated with an advanced electrochemical flow cell. We elucidated the mechanisms responsible for the signal enhancement observed during Pb2+ detection. Through rigorous experimentation and analysis, we achieved a limit of detection (3σ/slope) of 0.58 μg L−1 across a broad concentration range from 2 to 100 μg L−1. Our comprehensive evaluations encompassed not only critical accuracy assessments but also involved thorough tests to examine anti-interference capabilities and reproducibility. The stability of the system was carefully assessed by conducting twenty consecutive tests at a Pb2+ concentration of 20 μg L−1 with a RSD of 1.23%. Ultimately, we successfully employed the Mn-MoS2/Nafion-modified electrode for continuous monitoring of Pb2+ concentrations in water alongside the electrochemical flow cell system, and the recovery rates ranged impressively from 99.5 to 106%. This innovative approach demonstrates significant potential for real-time determination of heavy metal ions, thereby paving new avenues in environmental monitoring and analysis.