Pb²⁺ ions were detected on a carbon paste electrode modified with a geopolymer cement. The X-ray pattern and the infrared spectrum of the geopolymer synthesized from metakaolin and phosphoric acid showed a three-dimensional semi-crystalline structure. The obtained geopolymer cement indicates the formation of a broad hump structure between 17 and 40° (2θ) ascribed to the poly(phospho-siloxo) network. The electroanalysis of Pb²⁺ ions was done in three steps by stripping voltammetry: accumulation of Pb²⁺ ions in open circuit at pH 4, detection in NaNO₃ medium, and desorption. The peak current of Pb²⁺ ions obtained after 5-min accumulation on the geopolymer cement–modified carbon paste electrode was found to be four times higher than that from the bare carbon paste electrode. After optimization of some parameters related to the detection process (geopolymer cement content in paste, accumulation time, pH of detection medium, detection medium, electrolysis time, potential electrode), a calibration line was drawn in the concentration range from 0.2 × 10⁻⁶ M to 1.4 × 10⁻⁶ M. The detection limit obtained from a signal-to-noise ratio equal to 3 is 2.3 × 10⁻⁹ M. The interferences of some heavy metal ions, such as Hg²⁺, Cd²⁺, and Cu²⁺, and some inorganic ions Al³⁺, Fe²⁺, Zn²⁺, Na⁺, K⁺, Ca²⁺, Mg²⁺, Cl⁻, SO₄²⁻, and NO₃⁻ on CPE/GP-Dib₂ sensor were examined. The results obtained shows that these inorganic ions did not interfere with the determination of Pb²⁺ ions. It indicated that the prepared sensor possessed high selectivity for Pb²⁺.

在用地质聚合物水泥改性的碳糊电极上检测到Pb ²⁺离子。由偏高岭土和磷酸合成的地聚合物的X射线图和红外光谱显示出三维半晶体结构。将所得聚物水泥表示宽驼峰结构的17和40°（2之间形成θ）冲高聚（磷酸-硅氧）网络。通过溶出伏安法分三步进行Pb ²⁺离子的电分析：在pH为4的开路中Pb ²⁺离子的积累，在NaNO ₃介质中检测，以及解吸。Pb ²⁺的峰值电流在地质聚合物水泥改性的碳糊电极上累积5分钟后获得的离子比裸碳糊电极高四倍。在优化了与检测过程相关的一些参数（糊中的地聚合物胶结物含量，累积时间，检测介质的pH值，检测介质，电解时间，电势电极）后，绘制了浓度范围为0.2×10 ^-6的校准线M为1.4×10 ^-6M。从等于3的信噪比获得的检测极限为2.3×10 ^-9M。某些重金属离子（例如Hg 2 ⁺，Cd ²⁺，和Cu ²⁺以及一些无机离子Al ³⁺，铁²⁺，锌²⁺，钠⁺，K ⁺，钙²⁺，镁²⁺，氯^-，SO ₄ ^2-和NO ₃ ^-的CPE / GP-的Dib ₂传感器进行检测。获得的结果表明，这些无机离子不会干扰Pb ²⁺离子的测定。结果表明，所制备的传感器对Pb ²⁺具有较高的选择性。