Sasal Agnieszka, Tyszczuk-Rotko Katarzyna, Wójciak Magdalena, Sowa Ireneusz, Kuryło Michał
Faculty of Chemistry, Institute of Chemical Sciences, Maria Curie-Skłodowska University in Lublin, 20-031 Lublin, Poland.
Department of Analytical Chemistry, Medical University of Lublin, 20-093 Lublin, Poland.
Materials (Basel). 2020 Jul 10;13(14):3091. doi: 10.3390/ma13143091.
A differential-pulse adsorptive stripping voltammetric (DPAdSV) procedure with the use of pulsed potential accumulation and carboxyl functionalized multiwalled carbon nanotubes modified screen-printed carbon electrode (SPCE/MWCNTs-COOH) was delineated for simultaneous analysis of paracetamol (PA) and diclofenac (DF). The use of carboxyl functionalized MWCNTs and pulsed potential accumulation improves the analytical signals of PA and DF, and minimizes interferences from surfactants. After optimization of analytical conditions for this sensor, the peak currents of the two compounds were found to increase linearly with the increase in their concentration (5.0 × 10-5.0 × 10 mol L with a detection limit of 1.4 × 10 mol L for PA, and 1.0 × 10-2.0 × 10 mol L with a detection limit of 3.0 × 10 mol L for DF). For the first time, the electrochemical sensor allows simultaneous determination of PA and DF at concentrations of 24.3 ± 0.5 nmol L and 3.7 ± 0.7 nmol L, respectively, in wastewater samples purified in a sewage treatment plant.
本文描述了一种差分脉冲吸附溶出伏安法（DPAdSV），该方法采用脉冲电位富集，并使用羧基功能化多壁碳纳米管修饰的丝网印刷碳电极（SPCE/MWCNTs-COOH）同时分析扑热息痛（PA）和双氯芬酸（DF）。羧基功能化多壁碳纳米管和脉冲电位富集的使用提高了PA和DF的分析信号，并最大限度地减少了表面活性剂的干扰。在优化该传感器的分析条件后，发现两种化合物的峰值电流随其浓度增加呈线性增加（PA的浓度范围为5.0×10⁻⁵.0×10⁻⁴mol/L，检测限为1.4×10⁻⁵mol/L；DF的浓度范围为1.0×10⁻³.0×10⁻²mol/L，检测限为3.0×10⁻⁴mol/L）。该电化学传感器首次能够同时测定污水处理厂净化后的废水样品中浓度分别为24.3±0.5 nmol/L和3.7±0.7 nmol/L的PA和DF。
