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<p>This study reports the development of novel Pb<sup>2+</sup>–selective PVC membrane sensors based on lawsone derivative molecules used as ionophores for the determination of Pb<sup>2+</sup> ions in different environmental water samples. Among the developed sensors, the optimum membrane sensor displayed a near–Nernstian response of 25.0 ± 3.11 mV/decade over a wide linear concentration range of 1.0 × 10<sup>− 1</sup>–1.0 × 10<sup>− 6</sup> M, with a low limit of detection of 3.97 × 10<sup>− 7</sup> M. The proposed sensor demonstrated a rapid response time of approximately 8&#xa0;s during concentration transitions, and also showed an excellent selectivity toward Pb<sup>2+</sup> ions in the presence of various potentially interfering ions. In addition, the sensor worked effectively within a broad pH range of 4.0–10.0. The applicability of the novel sensor was successfully demonstrated in the analysis of Pb<sup>2+</sup> ions in various water samples. The obtained results indicate that PVC membrane sensors incorporating lawsone derivative ionophores offer a simple, rapid, selective and reliable approach for the determination of Pb<sup>2+</sup> ions in environmental samples.</p>

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Lawsone–based potentiometric sensors and their applications: Highly sensitive detection of Pb2+ ions in environmental water samples

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • Mehmet Emin Cakmak,
  • Oguz Özbek,
  • Kıymet Berkil Akar,
  • Caglar Berkel,
  • Meliha Burcu Gürdere,
  • Ömer Isildak

摘要

This study reports the development of novel Pb2+–selective PVC membrane sensors based on lawsone derivative molecules used as ionophores for the determination of Pb2+ ions in different environmental water samples. Among the developed sensors, the optimum membrane sensor displayed a near–Nernstian response of 25.0 ± 3.11 mV/decade over a wide linear concentration range of 1.0 × 10− 1–1.0 × 10− 6 M, with a low limit of detection of 3.97 × 10− 7 M. The proposed sensor demonstrated a rapid response time of approximately 8 s during concentration transitions, and also showed an excellent selectivity toward Pb2+ ions in the presence of various potentially interfering ions. In addition, the sensor worked effectively within a broad pH range of 4.0–10.0. The applicability of the novel sensor was successfully demonstrated in the analysis of Pb2+ ions in various water samples. The obtained results indicate that PVC membrane sensors incorporating lawsone derivative ionophores offer a simple, rapid, selective and reliable approach for the determination of Pb2+ ions in environmental samples.