Shalaby E A, Beltagi A M, Hathoot A A, Azzem M Abdel
Electrochemistry Laboratory, Chemistry Department, Faculty of Science, Menoufia University Shebin El-Kom 32511 Egypt
Department of Chemistry, Faculty of Science, Kafrelsheikh University Kafrelsheikh 33516 Egypt.
RSC Adv. 2023 Mar 2;13(11):7118-7128. doi: 10.1039/d3ra00168g. eCollection 2023 Mar 1.
A sensor for detecting Zn, Cd, and Pb ions simultaneously based on the square wave anodic stripping response at a bismuth antimony (Bi-Sb) nanocomposite electrode was developed. The electrode was prepared by electrodepositing bismuth and antimony on the surface of a carbon-paste electrode (CPE) while also reducing the analyte metal ions. The structure and performance of the Bi-Sb/CPE electrode were studied using scanning electron microscopy, X-ray diffraction, electrochemical impedance spectroscopy, and cyclic voltammetry. Operational conditions including the concentration of Sb and Bi, the type of electrolyte, pH, and preconcentration conditions were optimized. The linear ranges were determined to be 5-200 μg L for Zn, 1-200 μg L for Cd, and 1-150 μg L for Pb with the optimized parameters. The limits of detection were 1.46 μg L, 0.27 μg L, and 0.29 μg L for Zn, Cd, and Pb, respectively. Furthermore, the Bi-Sb/CPE sensor is capable of selective determination of the target metals in the presence of the common cationic and anionic interfering species (Na, K, Ca, Mg, Fe, Mn, Co, Cl, SO and HCO ). Finally, the sensor was successfully applied to the simultaneous determination of Zn, Cd, and Pb in a variety of real-world water samples.
开发了一种基于铋锑（Bi-Sb）纳米复合电极上的方波阳极溶出响应同时检测锌、镉和铅离子的传感器。该电极是通过在碳糊电极（CPE）表面电沉积铋和锑，同时还原分析物金属离子来制备的。使用扫描电子显微镜、X射线衍射、电化学阻抗谱和循环伏安法研究了Bi-Sb/CPE电极的结构和性能。优化了包括Sb和Bi的浓度、电解质类型、pH值和预浓缩条件在内的操作条件。在优化参数下，锌的线性范围为5-200 μg L，镉为1-200 μg L，铅为1-150 μg L。锌、镉和铅的检测限分别为1.46 μg L、0.27 μg L和0.29 μg L。此外，Bi-Sb/CPE传感器能够在存在常见阳离子和阴离子干扰物质（Na、K、Ca、Mg、Fe、Mn、Co、Cl、SO 和HCO ）的情况下选择性测定目标金属。最后，该传感器成功应用于多种实际水样中锌、镉和铅的同时测定。
