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

TALANTA

卷:144

Article

de Souza, Gustavo C. S.^1,2  de Santana, Eden E. A.¹  da Silva, Paulo A. B.^2,3  Freitas, Denilson V.²  Navarro, Marcelo²  Paim, Ana Paula S.²  Lavorante, Andre F.¹ 

[1] Univ Fed Rural Pernambuco, Dept Quim, BR-52171900 Recife, PE, Brazil

[2] Univ Fed Pernambuco, Dept Quim Fundamental, BR-50740560 Recife, PE, Brazil

[3] Inst Fed Alagoas, BR-57035000 Maceio, AL, Brazil

关键词: CdSe quantum dots;    Vitamin supplements;    Electrochemical synthesis;    Chromium ion (III);   

DOI  :  10.1016/j.talanta.2015.07.054

来源: Elsevier

【 摘 要 】

The fluorescence quenching of TGA-CdSe quantum dots (QDs) was used for Cr3+ 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 Cr3+ 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 Cr3+ quantification in vitamin supplements presented results from 82% to 98%. These Cr3+ 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. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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