Anodic Stripping Voltammetry of Heavy Metals on a Metal Catalyst Free Carbon Nanotube Electrode

Abstract

Anodic stripping voltammetry (ASV) determination of Pb2+, Cd2+, and Zn2+ was done using metal catalyst free carbon nanotube (MCFCN) electrodes. Osteryoung square wave stripping voltammetry (OSWSV) was selected for detection. The MCFCNTs are synthesized via Carbo Thermal Carbide Conversion method which leads to residual transition metal free in the CNT structure. The new material shows very good results in detecting heavy metal ions, such as Pb2+, Cd2+, and Zn2+. The calculated limits of detection were 13 nM, 32 nM and 50 nM for Pb2+, Cd2+ and Zn2+, respectively with a deposition time of 150 s.

Lab‐on‐a‐Chip Sensor with Evaporated Bismuth Film Electrode for Anodic Stripping Voltammetry of Zinc

“…Consequently, Zn stripping peaks in the 10 μM to 30 μM range exhibit shoulders on the positive side which broaden the peaks. As Zn levels decrease, Zn atoms stripping from Bi surface become the primary source, thus the peaks gradually migrated to nearly − 1.1 V [40–42]. Also, the Zn stripping peaks are ~100 mV more positive than those on electroplated Bi electrodes [32].…”

Development of gold-doped carbon foams as a sensitive electrochemical sensor for simultaneous determination of Pb (II) and Cu (II)

“…4(A) and (B) should be attributed to the oxidation peak of metal to itself (such as Pb to Pb 2+ , Cu to Cu 2+ ). Generally, the first monolayer deposited on another solid substrate (such as carbon-based electrodes) can have a considerably larger bonding energy than the bonding energy of metal to itself [4]. In addition, note that Pb 2+ and Cu 2+ were detected at potentials of approximately À0.45 V and 0.28 V, respectively.…”

“…Due to their high toxicity to the physiological systems of both human beings and animals, lead (Pb) and copper (Cu) ions have long been recognized as one form of hazardous pollutants of the environment and human health [1][2][3][4]. Thus, the development of a rapid and sensitive analytical method for monitoring of Pb 2+ and Cu 2+ is needed and has attracted great interest.…”

The Application of Nafion Metal Catalyst Free Carbon Nanotube Modified Gold Electrode: Voltammetric Zinc Detection in Serum

“…A hindrance shared by these methods is the general use of metal catalysts in their preparation that can contaminate the CNTs and reduce their effectiveness for stripping voltammetry applications [17,18]. Previously, metal catalyst free carbon nanotubes (MCFCNTs) fabricated via a solid-phase growth mechanism have been reported as a good electrode material with fast electron transfer rate and clear cyclic voltammetry background as well as for trace metal detection with stripping voltammetry with low limit of detection and high sensitivity [19,20]. The MCFCNT whisker used in this paper is a powder material with a whisker shape, which is different from the solid CNT electrode that we used previously [19,20].…”