Chemically modified electrodes (CMEs) based on polymeric films of E-5-((5-isopropyl-3,8-dimethylazulen-1-yl) diazenyl)-1H-tetrazole (L) deposited on the surface of the glassy carbon electrode have been used for the recognition of heavy metal (Me) ions. The electrochemical study of L was done by three methods: differential pulse voltammetry (DPV), cyclic voltammetry (CV), and rotating disk electrode voltammetry (RDE). The CV, DPV, and RDE studies for L were performed at different concentrations in 0.1 M tetrabutylammonium perchlorate solutions in acetonitrile. The polymeric films were formed by successive cycling or by controlled potential electrolysis (CPE). The film formation was proven by recording the CV curves of the CMEs in ferrocene solution. The CMEs prepared at different charges or potentials were used for detection of heavy metal ions. Synthetic samples of heavy metal ions (Cd(II), Pb(II), Cu(II), Hg(II)) of concentrations between 10⁻⁸ and 10⁻⁴ M were analyzed. The most intense signal was obtained for Pb(II) ion (detection limit of about 10⁻⁸ M). Pb(II) ion can be detected by these CMEs in waters at such concentrations. The ability of the ligand L to form complexes with Pb(II) and Hg(II) ions was also tested by UV-Vis spectrometry. The obtained results showed the formation of Me(II)L₂ complexes.

中文翻译：

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E-5-（（5-异丙基-3,8-二甲基azulen-1-yl）二氮烯基）-1H-四唑修饰电极对重金属离子的识别

基于沉积在玻璃碳电极表面的E-5-（（5-异丙基-3,8-二甲基氮杂烯-1-基）二氮烯基）-1H-四唑（L）的聚合物膜的化学修饰电极（CME）具有用于识别重金属（Me）离子。L的电化学研究通过三种方法完成：差分脉冲伏安法（DPV），循环伏安法（CV）和旋转盘电极伏安法（RDE）。L的CV，DPV和RDE研究在0.1 M高氯酸四丁基铵的乙腈溶液中以不同的浓度进行萃取。通过连续循环或通过受控电势电解（CPE）形成聚合物膜。通过记录二茂铁溶液中CME的CV曲线证明了膜的形成。以不同电荷或电势制备的CME用于检测重金属离子。分析了浓度在10 ^-8至10 ^-4 M之间的重金属离子（Cd（II），Pb（II），Cu（II），Hg（II））的合成样品。对于Pb（II）离子获得了最强的信号（检测极限约为10 ^-8 M）。这些CME可以在水中以这种浓度检测到Pb（II）离子。配体L的能力还通过紫外可见光谱法测试了与Pb（II）和Hg（II）离子形成络合物的过程。获得的结果表明形成了Me（II）L ₂配合物。