Direct Determination of Cu²⁺ Based on the Electrochemical Catalytic Reaction of Fe³⁺/Cu²⁺

Abstract

Copper ion (Cu2+) is one of the heavy metal ions which has been considered as a severe pollutant affecting the environment and human health. Therefore, it is necessary to detect Cu2+ sensitively and conveniently in food and drinks. However, the gold standard method that inductively coupled plasma mass spectrometry (ICP‐MS) is expensive equipment required and time‐consuming. In this work, a highly sensitive and facile electrochemical method was studied to directly determine the concentration of Cu2+ without cumbersome modification on the surface of glassy carbon electrode (GCE). In the presence of ferric ion (Fe3+), Cu2+ could play a role of catalyst in the detection system, and the electrochemical signal of differential pulse voltammetry (DPV) response to Cu2+ could be amplified obviously. Under the optimal conditions, a good linear relationship was obtained in the range of 1 nM to 5 μM with a detection limit of 57.5 pM (S/N=3) were obtained. Besides, the proposed method has good applicability for the detection of Cu2+ in tap water. Furthermore, the copper complex was detected and the results were indicated the proposed method was effective and sensitive.

A Förster resonance energy transfer enabled photo-rechargeable battery with an energetically misaligned Cu-porphyrin dye/Cu:V2O5 photocathode

“…A similar prole was obtained for Cu 2+ in a previous study on Cu 2+ detection. 36 This test conrmed the presence of Cu in the Cu 2+ state in Cu:V 2 O 5 .…”

Highly selective chromogenic and fluorogenic probe based on benzothiazole‐thiosemicarbazone Schiff base for detection of copper (II) in real samples

“…Excessive intake of Cu 2+ can lead to oxidative stress and neurodegenerative diseases such as Alzheimer's [9,10], Parkinson's [11], and Wilson's disease [12]. Currently, including plasma-mass spectrometry [13,14], atomic absorption spectrophotometry [15], inductively coupled plasma-atomic emission spectroscopy [16], ion selective electrode [17], electrochemical and electrochemical luminescence sensors [18,19], voltammetric detections [20], and UV-vis spectra [21] have been reported as conventional methods for the detection of Cu 2+ . Although these techniques can detect Cu 2+ at the parts per billion (ppb) levels, they necessitate timeconsuming sample pretreatment and separation, rendering them unsuitable for quick Cu 2+ detection.…”

Zn‐doped NiCo2O4 as Modified Electrode Nanomaterials for Enhanced Electrochemical Detection Performance of Cu(II)

“…Cu(II) has been released from industry, mining and waste gas, and cause considerable concern in recent years [1]. Once absorbed and accumulated of Cu(II) in the human body, it is easy to bring burden to human organs, ead to human metabolic disorder and pose a great threat to human health [2].…”