Karabayeva Gulnora, Qutlimurotova Nigora, Yakhshieva Zukhra, Qutlimurotova Rukhiya, Atakulova Nargiza, Tursunqulov Jasur
Department of Analytical Chemistry, Jizzakh State Pedagogical University, Jizzakh, Uzbekistan.
Department of Analytical Chemistry, National University of Uzbekistan, Tashkent, Uzbekistan.
Int J Anal Chem. 2025 Sep 19;2025:6675527. doi: 10.1155/ianc/6675527. eCollection 2025.
The demand for cobalt-based alloys has been steadily increasing due to advancements in industrial and cutting-edge technologies, particularly in metallurgy, where cobalt plays a crucial role in high-performance superalloys, battery production, and corrosion-resistant materials. Consequently, the concentration of cobalt ions in wastewater and environmental samples has exceeded permissible levels, raising significant ecological concerns. This study presents the development of an efficient method for the determination of cobalt(II) ions using a silver/mercury film working electrode (Hg(Ag)FE) modified with the organic dye (o-NF) through cyclic voltammetry (CV). Optimization of the experimental conditions revealed that an acetate buffer (0.1 M, pH 5.1) served as the supporting electrolyte, with an accumulation time of 10 s and a concentration of 2.0 μM o-nitrosophenol. The preconcentration conditions were adjusted to enhance the sensitivity and selectivity for cobalt(II) ion detection. The method exhibited a linear relationship in the concentration range of 0.040-0.160 μM ( = 0.9863), with a limit of detection (LOD) of 0.010 μM and a limit of quantification (LOQ) of 0.034 μM for Co(II) ions. The proposed method was successfully applied to the analysis of water samples from the Aydar-Arnasoy Reservoir, and the accuracy of the results was statistically validated using Student's -test. These findings demonstrate the potential of the developed method as an effective tool for environmental monitoring and the determination of cobalt ions in ecological protection initiatives.
由于工业和前沿技术的进步，特别是在冶金领域，钴在高性能超级合金、电池生产和耐腐蚀材料中发挥着关键作用，对钴基合金的需求一直在稳步增长。因此，废水和环境样品中钴离子的浓度已超过允许水平，引发了重大的生态问题。本研究提出了一种通过循环伏安法（CV）使用经有机染料（邻硝基苯酚，o-NF）修饰的银/汞膜工作电极（Hg(Ag)FE）测定钴（II）离子的有效方法。实验条件的优化表明，醋酸盐缓冲液（0.1 M，pH 5.1）用作支持电解质，富集时间为10 s，邻硝基苯酚浓度为2.0 μM。调整了预富集条件以提高钴（II）离子检测的灵敏度和选择性。该方法在0.040 - 0.160 μM的浓度范围内呈现线性关系（R² = 0.9863），钴（II）离子的检测限（LOD）为0.010 μM，定量限（LOQ）为0.034 μM。所提出的方法成功应用于艾达尔 - 阿尔纳索伊水库水样的分析，并使用学生t检验对结果的准确性进行了统计学验证。这些发现证明了所开发方法作为环境监测和生态保护举措中钴离子测定的有效工具的潜力。
