Sensitive, Selective and Reliable Detection of Fe3+ in Lake Water via Carbon Dots-Based Fluorescence Assay

Abstract

In this study, C-dots were facilely synthesized via microwave irradiation using citric acid and ethylenediamine as carbon precursors. The fluorescence emissions of the C-dots could be selectively quenched by Fe3+, and the degree of quenching was linearly related to the concentrations of Fe3+ presented. This phenomenon was utilized to develop a sensitive fluorescence assay for Fe3+ detection with broad linear range (0–250, 250–1200 μmol/L) and low detection limit (1.68 μmol/L). Most importantly, the assay demonstrated high reliability towards samples in deionized water, tap water and lake water, which should find potential applications for Fe3+ monitoring in complicated environments.

Synthesis and luminescence properties of two silver cluster-assembled materials for selective Fe3+ sensing

“…39 Using the calibration curves, we determined the LOD to be 0.05 nM L −1 for TUS 1 and 0.86 nM L −1 for TUS 2, which is well below the maximum permissible concentration of Fe 3+ in drinking water (3.57 μmol L −1 ) as required by the European Union. 39,40…”

“…To determine the limit of detection (LOD), we used the well-established 3σ method, where the LOD = 3σ/k, with σ being the standard deviation of the blank samples and k being the slope of the linear calibration plot. 39 Using the calibration curves, we determined the LOD to be 0.05 nM L −1 for TUS 1 and 0.86 nM L −1 for TUS 2, which is well below the maximum permissible concentration of Fe 3+ in drinking water (3.57 µmol L −1 ) as required by the European Union. 39,40 After establishing the sensing assay, we conducted careful experiments to investigate its selectivity.…”

“…39 Using the calibration curves, we determined the LOD to be 0.05 nM L −1 for TUS 1 and 0.86 nM L −1 for TUS 2, which is well below the maximum permissible concentration of Fe 3+ in drinking water (3.57 µmol L −1 ) as required by the European Union. 39,40 After establishing the sensing assay, we conducted careful experiments to investigate its selectivity. Since many ions often coexist in industrial effluents, it is crucial for a metal-ion sensing assay to be free from the interference of other ions.…”

Rose Bengal‐Derived Carbon Quantum Dots as a Fluorescence Probe for the Highly Sensitive Detection of Fe3+ Ions

“…We have cited additional references within the Supporting Information [51–88] . The Supporting Information includes: 1.…”

Carbon Dots-Based Fluorescence Assay for the Facile and Reliable Detection of Ag+ in Natural Water and Serum Samples

“…Currently, various analytical methods have been developed to quantitatively detect Ag + ; however, owing to the requirement for expensive instruments and complex sample preparation processes, the practical applications of these methods are greatly limited [ 4 ]. Fluorescence detection is a relatively new detection method, with the advantages of high sensitivity, simple operation, and good linearity [ 5 , 6 ]. Therefore, many fluorescence-sensing platforms have been developed for the sensitive and selective detection of Ag + .…”