Back to Search Start Over

Employment of electrochemically synthesized TGA-CdSe quantum dots for Cr(3+) determination in vitamin supplements.

Authors :
de Souza GC
de Santana ÉE
da Silva PA
Freitas DV
Navarro M
Paim AP
Lavorante AF
Source :
Talanta [Talanta] 2015 Nov 01; Vol. 144, pp. 986-91. Date of Electronic Publication: 2015 Jul 20.
Publication Year :
2015

Abstract

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.<br /> (Copyright © 2015 Elsevier B.V. All rights reserved.)

Details

Language :
English
ISSN :
1873-3573
Volume :
144
Database :
MEDLINE
Journal :
Talanta
Publication Type :
Academic Journal
Accession number :
26452917
Full Text :
https://doi.org/10.1016/j.talanta.2015.07.054