Ammonium Pyrrolidine Dithiocarbamate-Modified CdTe/CdS Quantum Dots as a Turn-on Fluorescent Sensor for Detection of Trace Cadmium Ions
Abstract
:1. Introduction
2. Experimental
2.1. Instruments and Reagents
2.2. Fluorescence Intensity Measurements
3. Results and Discussion
3.1. The Stability of the Fluorescence Intensity of the QD Solution
3.2. Optimization of the Concentration of APDC in the Detection Cuvette
3.3. Optimization of the pH of the Tris-HCl Buffer Solution
3.4. Fluorescence Quenching Caused by the Etching Effect of APDC in the CdTe/CdS QD Solution
3.5. Fluorescence Recovery Caused by Addition of Cd2+ to the APDC/CdTe/CdS QD Solution
3.6. Analytical Performance of the APDC/CdTe/CdS QD Solution
3.7. Interference Study
3.8. Sample Analysis
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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QD Sensor/Fluorescent Probe | Linear Range (μmol/L) | LOD (μmol/L) | Reference |
---|---|---|---|
Ag2S QD | 1–40 | 0.5460 | [33] |
competitive immunochromatographic strips/gold nanoparticles QD | 0.0022–0.0712 | 0.0016 | [34] |
4,5-bis (N, N-di (2- hydroxyethyl) iminomethyl) acridine fluorescent probe | 1–30 | 0.1300 | [36] |
6-mercaptonicotinic acid/L-Cys/gold nanoparticles fluorescent probe | 0.2–1.7 | 0.1000 | [37] |
CdTe/CdS QD | 0.0784–5.338 | 0.0235 | This work |
Ion | Number | Detected by the QD Solution (μg/L) a | Detected by AAS (μg/L) a | Relative Error (%) | Standard Deviation (SD) (μg/L) | Relative Standard Deviation (RSD) (%) |
---|---|---|---|---|---|---|
Cd2+ | Sample 1 | 28.75 | 28.17 | 2.01 | 0.56 | 1.94 |
Sample 2 | 14.39 | 14.85 | 3.10 | 0.41 | 2.87 | |
Sample 3 | 32.81 | 33.59 | 2.32 | 0.77 | 2.35 |
Ion | Number | Added (μg/L) | Detected by the QD Solution (μg/L) a. | Recovery (%) | Standard Deviation (SD) (μg/L) | Relative Standard Deviation (RSD) (%) |
---|---|---|---|---|---|---|
Cd2+ | Sample 4 | 40 | 39.10 | 97.75 | 0.62 | 1.77 |
Sample 5 | 80 | 78.43 | 98.04 | 2.08 | 2.65 | |
Sample 6 | 200 | 202.59 | 101.3 | 4.01 | 1.98 | |
Sample 7 | 400 | 391.73 | 97.93 | 9.44 | 2.41 |
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Yin, Y.; Yang, Q.; Liu, G. Ammonium Pyrrolidine Dithiocarbamate-Modified CdTe/CdS Quantum Dots as a Turn-on Fluorescent Sensor for Detection of Trace Cadmium Ions. Sensors 2020, 20, 312. https://doi.org/10.3390/s20010312
Yin Y, Yang Q, Liu G. Ammonium Pyrrolidine Dithiocarbamate-Modified CdTe/CdS Quantum Dots as a Turn-on Fluorescent Sensor for Detection of Trace Cadmium Ions. Sensors. 2020; 20(1):312. https://doi.org/10.3390/s20010312
Chicago/Turabian StyleYin, Yuan, Qingliang Yang, and Gang Liu. 2020. "Ammonium Pyrrolidine Dithiocarbamate-Modified CdTe/CdS Quantum Dots as a Turn-on Fluorescent Sensor for Detection of Trace Cadmium Ions" Sensors 20, no. 1: 312. https://doi.org/10.3390/s20010312