Wasąg Joanna, Grabarczyk Malgorzata
Department of Materials Engineering, Institute of Engineering and Technical Sciences, Faculty of Natural Sciences and Health, The John Paul II Catholic University of Lublin, 20-950 Lublin, Poland.
Department of Analytical Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Sklodowska University, 20-031 Lublin, Poland.
Materials (Basel). 2021 Sep 8;14(18):5148. doi: 10.3390/ma14185148.
A copper film modified glassy carbon electrode (CuF/GCE) and a novel copper film with carbon nanotubes modified screen-printed electrode (CuF/CN/SPE) for anodic stripping voltammetric measurement of ultratrace levels of Cd(II) are presented. During the development of the research procedure, several main parameters were investigated and optimized. The optimal electroanalytical performance of the working electrodes was achieved in electrolyte 0.1 M HCl and 2 × 10 M Cu(II). The copper film modified glassy carbon electrode exhibited operation in the presence of dissolved oxygen with a calculated limit of detection of 1.7 × 10 M and 210 s accumulation time, repeatability with RSD of 4.2% ( = 5). In the case of copper film with carbon nanotubes modified screen-printed electrode limit of detection amounted 1.3 × 10 M for accumulation time of 210 s and with RSD of 4.5% ( = 5). The calibration curve has a linear range in the tested concentration of 5 × 10-5 × 10 M (r = 0.999) for CuF/GCE and 3 × 10-3 × 10 M (r = 0.999) for CuF/CN/SPE with 210 s accumulation time in both cases. The used electrodes enable trace determination of cadmium in different environmental water samples containing organic matrix. The validation of the proposed procedures was carried out through analysis certified reference materials: TM-25.5, SPS-SW1, and SPS-WW1.
提出了一种用于阳极溶出伏安法测定超痕量镉（II）的铜膜修饰玻碳电极（CuF/GCE）和一种新型的含碳纳米管的铜膜修饰丝网印刷电极（CuF/CN/SPE）。在研究过程的开发中，对几个主要参数进行了研究和优化。工作电极在0.1 M HCl和2×10⁻⁶ M Cu（II）的电解液中实现了最佳的电分析性能。铜膜修饰玻碳电极在溶解氧存在的情况下仍能运行，计算得出的检测限为1.7×10⁻⁸ M，富集时间为210 s，重复性相对标准偏差（RSD）为4.2%（n = 5）。对于含碳纳米管的铜膜修饰丝网印刷电极，在富集时间为210 s时，检测限为1.3×10⁻⁸ M，RSD为4.5%（n = 5）。在两种情况下，当富集时间为210 s时，CuF/GCE的校准曲线在5×10⁻⁸ - 5×10⁻⁵ M的测试浓度范围内呈线性（r = 0.999），CuF/CN/SPE的校准曲线在3×10⁻⁸ - 3×10⁻⁵ M的测试浓度范围内呈线性（r = 0.999）。所使用的电极能够对含有有机基质的不同环境水样中的镉进行痕量测定。通过分析有证标准物质TM - 25.5、SPS - SW1和SPS - WW1对所提出的方法进行了验证。
