Potentiometric Detection of Mercury(II) Ions Using a Carbon Paste Electrode Modified with Substituted Thiourea-Functionalized Highly Ordered Nanoporous Silica

Abstract

A potentiometric sensor is reported for the mercury(II) detection, which uses substituted thiourea-functionalized nanoporous silica (FTU-LUS-1) as the sensitive material. Substituted thiourea (FTU) and FTU-LUS-1 were first prepared and then characterized . The electrode exhibited a detection limit of 7.0 × 10 -8 mol dm -3 . Moreover, the selectivity coefficient, response time, performance, sensitivity and stability of the modified electrode were investigated. The electrode presented a response time of about 35 s, a high performance and sensitivity in a wide range of cation activities as well as good long term stability (more than 9 months). The method was satisfactory and could also be used to monitor the mercury(II) ion concentration in waste water and fish samples.

Highly sensitive ‘naked-eye’ colorimetric detection of thiourea using gold nanoparticles

“…As an important material, thiourea (TU) and its derivatives have been widely applied in various elds, including industry, medicine, agriculture and chemistry. [1][2][3][4][5][6][7][8][9][10][11] For instance, thiourea is usually used for electrodeposition of metals, rubber vulcanization, cleaning, detection, and leaching of gold in industry. [1][2][3][4][5][6] In agriculture, thiourea and its derivatives are also employed as a fertilizer, fungicide for some fruits, and inhibiter for the dormancy of seeds and tubers.…”

Synthesis, Characterization and Analytical Applications of Novel Potentiometric Sensor Based on Chromium(III)Boratotungstophosphate

“…It was also observed that probability value (′p′ value) was greater than alpha (> 0.05) which provided the evidence that the proposed electrode can be suitably used to check the presence of Hg 2+ in the real samples. Comparability of proposed electrode with reported sensors selective for mercury ions: The working of proposed electrode was compared with the reported sensors selective for mercury [40][41][42][43][44] and found that electrode based on chromium(III) boratotungstophosphate was superior with respect to its properties (Table-11).…”

“…A number of methods, such as atomic absorption spectrometry (AAS) [3,4], X-ray fluorescence spectrometry [5] and potentiometry [6] have been used for determination of mercury in the analytical samples. Very few sensors for potentiometric determination of mercury(II) based on carbon paste electrode (CPE) [7,8] and coated wire electrodes [9,10] have been reported. However, these electrodes are not very fruitful as they…”

Immoblization of Thiol-Functionalized Nanosilica on the Surface of Poly(ether sulfone) Membranes for the Removal of Heavy-Metal Ions from Industrial Wastewater Samples

“…In past years, we described the use of functionalized nanoporous silica gels with different grafting moieties such as 1, 3-dicyclohexyl-2-propylguanidine, phenylthiourea, and dipyridyl − for the selective determination or separation of various heavy-metal ions in aqueous solutions. We showed that thiourea-functionalized nanoporous silica as a selective material can be used to monitor Hg­(II) ions in wastewater and fish samples . In this study, thiol-functionalized nanosilica (MNS) prepared by a sol–gel reaction between 3-mercaptopropyltrimethoxysilane (MPTMS) and silica nanoparticles.…”