Flow Injection Analysis of Mercury Using 4-(Dimethylamino) Benzaldehyde-4-Ethylthiosemicarbazone as the Ionophore of a Coated Wire Electrode

Abstract

A flow injection analysis (FIA) incorporating a thiosemicarbazone-based coated wire electrode (CWE) was developed method for the determination of mercury(II). A 0.1 M KNO3 carrier stream with pH between 1 and 5 and flow rate of 1 mL·min−1 were used as optimum parameters. A linear plot within the concentration range of 5 × 10−6–0.1 M Hg(II), slope of 27.8 ± 1 mV per decade and correlation coefficient (R2) of 0.984 were obtained. The system was successfully applied for the determination of mercury(II) in dental amalgam solutions and spiked environmental water samples. Highly reproducible measurements with relative standard deviation (RSD < 1% (n = 3)) were obtained, giving a typical throughput of 30 samples·h−1.

A ditopic calix[4]pyrrole amide derivative: highlighting the importance of fundamental studies and the use of NaPh4B as additive in the design and applications of mercury(ii) ion selective electrodes

“…A great deal of the published material involves the use of the NaPh 4 B (or related salts) as an additive, [20][21][22][23][24][25]28,29,31,[34][35][36][37][38][39]41,43,44,[46][47][48][49][50][51][52][66][67][68][69][70][71][72][73][74][75] which as shown in this paper interacts with Hg(II) and this has implications on the characteristics reported for these electrodes. In the absence of fundamental studies, the response of the electrode may result from the response of the additive rather than the ionophore (this may be occurring in the prior studies mentioned).…”

“…Optimal working conditions for the potentiometric response of the electrode in terms of its membrane composition and the pH of the aqueous solution were investigated together with the characteristics of this electrode regarding linear working range, detection limit, lifetime and interferences. The advantages of this new electrode relative to those based on ionophores (such as crown ethers derivatives, [21][22][23][24][25][26] calixarene derivatives, [27][28][29] cryptand 22, 30 tetra-aza macrocycles [31][32][33] as well as other compounds [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53] ) are discussed.…”

NHC‐Pd complex heterogenized on graphene oxide for cross‐coupling reactions and supercapacitor applications

“…[22] All the functional groups of GO@NHC [23] were found to be present in the IR spectrum of GO@NHC ( Figure 1c) and the C=N stretching at 1,564 cm −1 along with the aromatic C-H vibrations in the region of 756-615 cm −1 confirm the formation of GO@NHC. [23] The presence of functional groups in the GO@NHC-Pd catalyst can be confirmed from Figure 1d. The peak at 1,129 cm −1 corresponds to the exact planar asymmetric stretching vibrations arising from the C-H bond of the palladium-coordinated N-heterocyclic carbene.…”

Mercury in dental amalgam: Are our health care workers at risk?

“…Samples were stored at 4°C and analysis was performed within a month. Cold vapor atomic absorption spectrometry using a flow injection mercury system (FIMS-400) was used to determine urinary mercury (Tahir et al, 2012;Md. Noh et al, 1998).…”