Fabrication of Electrochemical Sensor Based on CeO₂−SnO₂ Nanocomposite Loaded on Pd Support for Determination of Nitrite at Trace Levels

Abstract

Here, an electrochemical sensor based on CeO2‐SnO2/Pd was prepared and used for highly selective and sensitive determination of nitrite in some real samples. This nanocomposite was characterized by various methods like X‐ray photoelectron spectroscopy, X‐ray diffraction, energy dispersive spectroscopy, Fourier‐transform infrared spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy. The electrochemical behavior of the sensor was evaluated by cyclic voltammetry. The results showed excellent catalytic property of the nanocomposite as a an electrocatalyst for nitrite oxidation. In the following, the experimental parameters affecting the analytical signal for nitrite were optimized. Under the optimal conditions, the limit of detection and sensitivity of the sensor were calculated as 0.10 μM and 652.95 μA.mM−1.cm−2, respectively. Also, the response of the sensor was linear in the range of 0.36 to 2200 μM of nitrite. Finally, some of the inherent features of the sensor such as repeatability, reproducibility and stability were examined after evaluation of the sensor selectivity in the presence of several interfering species.

The enhanced electrocatalytic performance of nanoscopic Cu6Pd12Fe12 heterometallic molecular box encaged cytochrome c

“…The entries in Table 1 show the excellent capabilities of the Cyt-c@Cu-HMHMB composite for the electrochemical sensing of nitrite. 40,[69][70][71][72][73][74][75][76] The practical value of an electrochemical sensor is significantly influenced by the reproducibility and repeatability of its estimates. The reproducibility of the Cytc@Cu-HMHMB nanocomposite-based electrode towards the detection of nitrite was assessed via DPV analysis.…”

A facile synthesis of Sn-doped CeO2 nanoparticles: High performance electrochemical nitrite sensing application

“…The existence of excess amount of nitrites in human system can have been adverse effect with several health problems like leukemia, bowel cancer and brain tumors. For infants, nitrite can combine with hemoglobin in the blood to form methemoglobin by the irreversible oxidation of Fe 2+ to Fe 3+ , which leads to a condition commonly known as "blue baby syndrome" [3]. Further, nitrite ions are easily reacted with amines to form nitrosamines which are highly carcinogenic compounds that play a significant role in the development of stomach cancer.…”

Elaeocarpus Ganitrus Structured Mesoporous Hybrid Mn3+/4+ loaded Zirconia Self Assembly as a Versatile Amperometric Probe for the Electrochemical Detection of Nitrite

“…[7] Electrochemists are in search of a highly sensitive and selective tool for the detection of nitrite in drinking water as well as in nitrite containing foods. [8][9][10] Because of the fact that, WHO (world health organization) has limited the nitrite content in drinking water to 65.2 μM, control and management of nitrite have gained greater significance. There are many analytical tools available for the detection of nitrite like, spectrophotometry, chromatography, chemosensing and electrochemical detection.…”

“…Consumption of nitrite beyond the permissible limits may lead to infertility, [5] can cause the transformation of ferrohemoglobin to ferrihemoglobin thereby suppressing the oxygen carrying ability of hemoglobin [6] and high risk of cancer due to the formation of N‐nitrosamines [7] . Electrochemists are in search of a highly sensitive and selective tool for the detection of nitrite in drinking water as well as in nitrite containing foods [8–10] . Because of the fact that, WHO (world health organization) has limited the nitrite content in drinking water to 65.2 μM, control and management of nitrite have gained greater significance.…”