Detection of Cu²⁺in Water Based on Histidine-Gold Labeled Multiwalled Carbon Nanotube Electrochemical Sensor

Abstract

Based on the strong interaction between histidine and copper ions and the signal enhancement effect of gold-labeling carbon nanotubes, an electrochemical sensor is established and used to measure copper ions in river water. In this study the results show that the concentrations of copper ion have well linear relationship with the peak current in the range of 10−11–10−7 mol/L, and the limit of detection is 10−12 mol/L. When using this method to detect copper ions in the Xiangjiang River, the test results are consistent with the atomic absorption method. This study shows that the sensor is convenient to be used in daily monitoring of copper ions in river water.

A Simple Colorimetric Assay for Sensitive Cu2+ Detection Based on the Glutathione-Mediated Etching of MnO2 Nanosheets

“…The detection techniques of Cu 2+ have been greatly developed, such as atomic absorption spectroscopy (AAS) (Lima et al, 2012), inductively coupled plasma mass spectrometry (ICP-MS) (Dai et al, 2012;Khan et al, 2014), electrochemical techniques (Flavel et al, 2011;Zhu et al, 2017), fluorescence methods (Lan et al, 2010;Zhang et al, 2014;Zhang et al, 2020) and colorimetric assays (Ma et al, 2011;Weng et al, 2013;Le et al, 2014;Wang et al, 2017;Luo et al, 2020). Some of these methods suffer from the drawbacks of requirements for large instruments, special operators, complex sample pretreatment process, or poor reproducibility and reliability, which limits their on-side rapid detection and practical application (Du et al, 2014;Wang et al, 2019a).…”

Ultrasensitive Optical Chemosensor for Cu(II) Detection

“…The significance of sensing and detection of heavy metals in aquatic samples is unquestionable [18, 19]. The tracing of the heavy metal ions in the environment (biological sample or wastewater) has several significant limitations such as the low detection limit, the sensitivity of investigated techniques, and the interference with system components.…”