Novel Amperometric Mercury-Selective Sensor Based on Organic Chelator Ionophore
Abstract
:1. Introduction
2. Results and Discussion
2.1. Structural, Morphological, and Chemical Characterization of Nanostructures
2.2. Electrochemical Characterisation of the Modified Electrodes in the Presence of Hg2+
2.3. Optimization of Fixed-Potential Amperometry Experimental Conditions
2.3.1. Influence of the Applied Potential
2.3.2. Influence of pH
2.3.3. Influence of the Ionophore Concentration
2.4. Determination of Mercury Cations at Ionophore Modified Electrodes—Influence of MWCNT
2.5. Repeatability, Reproducibility, and Stability
2.6. Selectivity
2.7. Application
3. Materials and Methods
3.1. Reagents
3.2. Instrumentation
3.3. Preparation of [N, N Di (2-hydroxy-5-[(4-nitrophenyl)diazenyl]benzaldehyde) benzene-1,2-diamine) (NDBD)
3.4. Electrode Modification
3.5. Mercury Response Measurement
4. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Ionophore conc. /% | L.R. /µM | Slope /µA cm−2 µM−1 | LOD /µM | LOQ /µM | R2 |
---|---|---|---|---|---|
0.3 | 150–1250 | 38.1 | 28.6 | 94.4 | 0.9995 |
0.5 | 150–1250 | 55.0 | 11.6 | 38.3 | 0.9999 |
0.7 | 150–1250 | 29.0 | 32.3 | 106.6 | 0.9993 |
0.9 | 150–1250 | 29.1 | 29.8 | 98.3 | 0.9994 |
MWCNT conc. /% | L.R. /µM | Slope /µA cm−2 µM−1 | LOD /µM | LOQ /µM | R2 |
---|---|---|---|---|---|
0.2 | 1–25 | 43.1 | 1.7 | 3.9 | 0.99605 |
0.5 | 1–25 | 514.6 | 0.06 | 0.20 | 0.99898 |
Electrode Composition | Method | L.R /µM | LOD /µM | Ref |
---|---|---|---|---|
TiO2/MWCNT/DHAHPTMA/GCE | LSASV | 0.1–100 | 0.025 | [9] |
Cu–CoHCF/GCE (+CySH in sol.) | CA | 0.25–5.0 | 0.080 | [17] |
MnPc/Nafion/GCE | DPSCA | 2.0–12.0 | NS | [23] |
MWCNT-BHOB-SiNP/CPE | POT | 0.018–100,000 | 0.018 | [27] |
Crown ether/MWCNT/CPE | LSASV | 25–548 | 1.2 | [43] |
MB/AuNP/MWCNT/PANI/ITO | DPASV | 0.05–50 | 0.40 | [44] |
MWCNT-CQD/GCE | DPV | 0.001–0.012 | 0.0005 | [45] |
MWCNT-POCF/PIGE | DPASV | 0.025–0.41 | 0.0082 | [46] |
NDBD/MWCNT/GCE | CA | 1.0–25.0 | 0.060 | This work |
Sample | Added /µM | Found /µM | Recovery /% |
---|---|---|---|
2.0 | 1.92 ± 0.07 | 96.0 | |
Tap water | 5.0 | 4.87 ± 0.10 | 97.4 |
10.0 | 9.81 ± 0.18 | 98.1 | |
Milk | 2.0 5.0 10.0 | 1.87 ± 0.05 4.81 ± 0.10 9.75 ± 0.21 | 93.5 96.2 97.5 |
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Elsebai, B.; Ghica, M.E.; Abbas, M.N.; Brett, C.M.A. Novel Amperometric Mercury-Selective Sensor Based on Organic Chelator Ionophore. Molecules 2023, 28, 2809. https://doi.org/10.3390/molecules28062809
Elsebai B, Ghica ME, Abbas MN, Brett CMA. Novel Amperometric Mercury-Selective Sensor Based on Organic Chelator Ionophore. Molecules. 2023; 28(6):2809. https://doi.org/10.3390/molecules28062809
Chicago/Turabian StyleElsebai, Basant, Mariana Emilia Ghica, Mohammed Nooredeen Abbas, and Christopher M. A. Brett. 2023. "Novel Amperometric Mercury-Selective Sensor Based on Organic Chelator Ionophore" Molecules 28, no. 6: 2809. https://doi.org/10.3390/molecules28062809