VXC-72R/ZrO2/GCE-Based Electrochemical Sensor for the High-Sensitivity Detection of Methyl Parathion

Abstract

In this work, a carbon black (VXC-72R)/zirconia (ZrO2) nanocomposite-modified glassy carbon electrode (GCE) was designed, and a VXC-72R/ZrO2/GCE-based electrochemical sensor was successfully fabricated for the high-sensitivity detection of methyl parathion (MP). Electrochemical measurements showed that the VXC-72R/ZrO2/GCE-based electrochemical sensor could make full use of the respective advantages of the VXC-72R and ZrO2 nanoparticles to enhance the MP determination performance. The VXC-72R nanoparticles had high electrical conductivity and a large surface area, and the ZrO2 nanoparticles possessed a strong affinity to phosphorus groups, which could achieve good organophosphorus adsorption. On the basis of the synergistic effect generated from the interaction between the VXC-72R and ZrO2 nanoparticles, the VXC-72R/ZrO2/GCE-based electrochemical sensor could show excellent trace analysis determination performance. The low detection limit could reach up to 0.053 μM, and there was a linear concentration range of 1 μM to 100 μM. Such a high performance indicates that the VXC-72R/ZrO2/GCE-based electrochemical sensor has potential in numerous foreground applications.

Stripping Voltammetric Determination of Methyl Parathion at Activated Carbon Nanopowder Modified Electrode

“…The limit of detection was found to be as low as 2.5 nmol L −1 (S/N=3). The revision of the recently published papers revealed, that the detection limit for methyl parathion determination reached applying electrochemical sensors varies over a large range: from 0.05 nmol L −1 to 53 nmol L −1 (Table 1) [8–20]. The European Council Directive 98/83/EC on the quality of water intended for human consumption (Council Directive 98/83/EC, 1998) sets the limit value of the individual pesticides in drinking water at 0.1 μg L −1 (3.8 nmol L −1 ), and that of the total pesticides at 0.5 μg L −1 (19 nmol L −1 ), while the U.S. Environmental Protection Agency Office of Ground Water and Drinking Water (OGWDW) sets the health advisory level for methyl parathion in drinking water at 2 μg L −1 (7.6 nmol L −1 ).…”

“…Therefore, they emerged as a promising alternative to the time‐consuming and expensive off‐site chromatographic techniques currently used [5–7]. Some typical examples include the electrochemical quantification of nitrophenyl substituted OPs, selecting methyl parathion as a model [8–25],…”

The Corrosion Behavior of As-cast Mg–4Al–<i>x</i>Er–0.3Mn Alloys

“…However, the application of the magnesium alloys are limited owing to highly active and the lowly standard electrode potential of magnesium, which results in poor corrosion resistance of pure magnesium and magnesium alloys. [1][2][3] Meanwhile, MgO and Mg(OH) 2 produced on the surface of the magnesium alloys during the corrosion process are destroyed due to the presence of Cland other ions in the aqueous environments, which leads to further corrosion. 4,5 Adding alloying element in magnesium alloys can improve the corrosion resistance and promote the mechanical properties of the alloy.…”

“…13 According to the previous studies, adding RE elements to the alloy can form the more stable passivation film on the surface. [1][2][3][4][5][6][7][8][9][10][11][12] However, there are very few reports about Er effect on the corrosion behavior in Mg-Al system alloys (to the knowledge of the authors). Therefore, in this paper the corrosion behavior of the Mg-4Al-xEr-0.3Mn alloys (denoted as AE4x, E represents rare earth element Er, x = 2, 4 and 6) was analyzed and the corrosion mechanism was revealed.…”

Comparative Study of Electrochemical Biosensors Based on Highly Efficient Mesoporous ZrO2-Ag-G-SiO2 and In2O3-G-SiO2 for Rapid Recognition of E. coli O157:H7

“… 13 − 15 Meanwhile, functionalized graphene is achieved by synthesis and preparation, for example, the carbon core structure can be oxidized forming GO, the reduced structure with vacancy defects is RGO, and structures a few nanometers in size with quantum phenomena are GQDs. 16 − 18 ZrO 2 as a transducer is a promising material in the fabrication of a biosensor due to biocompatibility, phenomenal electrical and surface charge properties, and oxygen moieties. 19 Silver nanoparticles (AgNPs) have low cost, nontoxicity, biocompatibility, and steady and high catalytic activity, helping us utilize it for biological sensing.…”