During the present study, biopolymer lignin was extracted, in particular, from sugar beet pulp (molasses) from the Tadla region (224 km from Marrakech, Morocco). The lignin was characterized by infrared spectroscopy (FTIR) and thermogravimetric TG/DTA analysis and then used as a modifier to enhance the electroanalytical detection of heavy metal ion traces. The performance of the lignin/CPE sensor to detect lead (II) was studied by cyclic voltammetry (CV) and square-wave voltammetry in 0.3 mol L⁻¹ NaCl. With optimized experimental parameters, the lignin/CPE sensor developed has a minimum detection limit of 2.252.10⁻¹¹ M for Pb (II). The proposed working electrode has been successfully applied for the coanalysis of Pb (II) in tap water with good results.

中文翻译：

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用于电化学检测水中 Pb(II) 的生物聚合物改性碳糊电极

在本研究中，生物聚合物木质素是从 Tadla 地区（距摩洛哥马拉喀什 224 公里）的甜菜浆（糖蜜）中提取的。通过红外光谱 (FTIR) 和热重 TG/DTA 分析对木质素进行了表征，然后将其用作改性剂以增强对重金属离子痕量的电分析检测。^{在 0.3 mol L -1} NaCl中通过循环伏安法 (CV) 和方波伏安法研究了木质素/CPE 传感器检测铅 (II) 的性能。通过优化实验参数，开发的木质素/CPE 传感器对 Pb (II) 的最低检测限为 2.252.10 ^-11 M。所提出的工作电极已成功应用于自来水中 Pb (II) 的共分析，并取得了良好的效果。