Determination of copper in biodiesel samples using CdTe-GSH quantum dots as photoluminescence probes

Lima, Adriana Silva; Rodrigues, S. Sofia M.; Korn, Maria Graças A.; Ribeiro, David S.M.; Santos, João L.M.; Teixeira, Leonardo Sena Gomes

doi:10.1016/j.microc.2014.06.021

Cited by 20 publications

(7 citation statements)

References 32 publications

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“…6, S9), which are chosen on the basis of their affinity with GSH [31,53] or their abundance in environmental samples. In most cases, signals in response to potassium (K + ) were very weak, and a little signal in response to iron ions (Fe 3+ /Fe 2+ ) (one third response signal of Cu 2+ ) or lead ions (Pb 2+ ) (one fifth response signal of Cu 2+ ) could be observed in some studies [28,54]. Zinc ions (Zn 2+ ) showed activity to some Cu 2+ sensors, even with higher signals compared to Cu 2+ , while magnesium (Mg 2+ ) hardly present activity to Cu 2+ detection methods [55,56].…”

Section: Characterization Of the Tinsai Sensor Responsementioning

confidence: 99%

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Target induced interfacial self-assembly of nanoparticles: A new platform for reproducible quantification of copper ions

Liang

Zhang

et al. 2016

Talanta

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Section: Characterization Of the Tinsai Sensor Responsementioning

confidence: 99%

“…However, excessive copper ions become threatening contamination to the environment, i.e. biodiesel [28] and water resources [29]. Thus, a technique for sensitive and reproducible determination of copper ions is in demand.…”

Section: Introductionmentioning

confidence: 99%

Target induced interfacial self-assembly of nanoparticles: A new platform for reproducible quantification of copper ions

Liang

Zhang

et al. 2016

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“…Cadmium telluride (CdTe) QDs were used due to the great simplicity of preparation by hydrothermal method [3], which allowed the obtaining of nanocrystals with narrow size distribution, narrow and symmetric emission spectra, high quantum yield and long-term water stability. Moreover, in recent years CdTe QDs have been extensively used in chemical analysis confirming to be excellent fluorescent probes for the monitoring of a wide variety of species [4][5][6][7][8][9][10]. The CdTe QDs were synthesized by using a short chain thiol molecule, 3-mercaptopropionic acid (MPA), as capping ligand and distinct heating times in order to attain sizes ranging from 2.48 to 3.81 nm.…”

Section: Introductionmentioning

confidence: 99%

Multiplexed analysis combining distinctly-sized CdTe-MPA quantum dots and chemometrics for multiple mutually interfering analyte determination

Bittar

Ribeiro

Páscoa

et al. 2017

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Semiconductor quantum dots (QDs) have demonstrated a great potential as fluorescent probes for heavy metals monitoring. However, their great reactivity, whose tunability could be difficult to attain, could impair selectivity yielding analytical results with poor accuracy. In this work, the combination in the same analysis of multiple QDs, each with a particular ability to interact with the analyte, assured a multi-point detection that was not only exploited for a more precise analyte discrimination but also for the simultaneous discrimination of multiple mutually interfering species, in the same sample. Three different MPA-CdTe QDs (2.5, 3.0 and 3.8nm) with a good size distribution, confirmed by the FWHM values of 48.6, 55.4 and 80.8nm, respectively, were used. Principal component analysis (PCA) and partial least squares regression (PLS) were used for fluorescence data analysis. Mixtures of two MPA-CdTe QDs, emitting at different wavelength namely 549/566, 549/634 and 566/634nm were assayed. The 549/634nm emitting QDs mixture provided the best results for the discrimination of distinct ions on binary and ternary mixtures. The obtained RMSECV and RCV values for the binary mixture were good, namely, from 0.01 to 0.08mgL and from 0.74 to 0.89, respectively. Regarding the ternary mixture the RMSECV and RCV values were good for Hg(II) (0.06 and 0.73mgL, respectively) and Pb(II) (0.08 and 0.87mg L, respectively) and acceptable for Cu(II) (0.02 and 0.51mgL, respectively). In conclusion, the obtained results showed that the developed approach is capable of resolve binary and ternary mixtures of Pb (II), Hg (II) and Cu (II), providing accurate information about lead (II) and mercury (II) concentration and signaling the occurrence of Cu (II).

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“…The analytical potential of QDs also has been explored [11,16,[20][21][22][23][24]. Because QDs are small and have a high surface area-to-volume ratio, their fluorescence is extremely sensitive to modifications on their surface.…”

Section: Introductionmentioning

confidence: 99%

Employment of electrochemically synthesized TGA–CdSe quantum dots for Cr3 determination in vitamin supplements

Souza

Santana

Silva

et al. 2015

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The fluorescence quenching of TGA-CdSe quantum dots (QDs) was used for Cr(3+) quantification in vitamin supplements. The QD was electrochemically synthesized, demonstrating high reproducibility with control of particle size, thus making it a clean method, without the presence of reducing agents. Under ideal conditions, with the fluorescence band at 551 nm (excitation 365 nm), the maximum fluorescence quenching was observed at pH 4.0, with a time of 200 s for each data acquisition. Under optimum experimental conditions, linear quenching was observed for Cr(3+) in the range of 25.0-325.0 ng L(-1) (R=0.9996, n=6), a limit of detection of 5.67 ng L(-1), and relative standard deviation of 4.43% (n=10). The recovery test for Cr(3+) quantification in vitamin supplements presented results from 82% to 98%. These Cr(3+) determination results were compared to the same vitamin supplement sample using flame atomic absortion spectrometry (FAAS) method, and no significant differences were observed at 95% confidence level.

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Determination of copper in biodiesel samples using CdTe-GSH quantum dots as photoluminescence probes

Cited by 20 publications

References 32 publications

Target induced interfacial self-assembly of nanoparticles: A new platform for reproducible quantification of copper ions

Target induced interfacial self-assembly of nanoparticles: A new platform for reproducible quantification of copper ions

Multiplexed analysis combining distinctly-sized CdTe-MPA quantum dots and chemometrics for multiple mutually interfering analyte determination

Employment of electrochemically synthesized TGA–CdSe quantum dots for Cr3 determination in vitamin supplements

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