Publication: Use of nitrogen-doped amorphous carbon nanodots (N-CNDs) as a fluorometric paper-based sensor: A new approach for sensitive determination of lead(ii) at a trace level in highly ionic matrices
Issued Date
2021-08-28
Resource Type
ISSN
17599679
17599660
17599660
Other identifier(s)
2-s2.0-85113383081
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Mahidol University
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SCOPUS
Bibliographic Citation
Analytical Methods. Vol.13, No.32 (2021), 3551-3560
Suggested Citation
Siwaluck Boonruang, Puttaraksa Naksen, Wipark Anutrasakda, Kantapat Chansaenpak, Vinich Promarak, Rattaporn Saenmuangchin, Chutima Phechkrajang, Purim Jarujamrus Use of nitrogen-doped amorphous carbon nanodots (N-CNDs) as a fluorometric paper-based sensor: A new approach for sensitive determination of lead(ii) at a trace level in highly ionic matrices. Analytical Methods. Vol.13, No.32 (2021), 3551-3560. doi:10.1039/d1ay00765c Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/76512
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Title
Use of nitrogen-doped amorphous carbon nanodots (N-CNDs) as a fluorometric paper-based sensor: A new approach for sensitive determination of lead(ii) at a trace level in highly ionic matrices
Abstract
This work reports a facile synthesis of nitrogen-doped amorphous carbon nanodots (N-CNDs) and their use as a fluorometric paper-based sensor for the determination of Pb2+ at a low concentration. Both solution-based and paper-based systems were developed. The results show that the linearity ranges for Pb2+ determination were 0.010-10 mg L-1 (LOD = 0.008 mg L-1) and 0.005-0.075 mg L-1 (LOD = 0.004 mg L-1) for the solution-based and the paper-based sensors, respectively. Furthermore, the developed sensors show relatively high selectivity toward Pb2+ over ten other metal cations of different charges including As3+, Hg2+, Cd2+, Mg2+, Ni2+, Zn2+, Fe3+, Cu2+, Ba2+, and Ag+. The mechanism of Pb2+ determination was also investigated. It was found that the sensors exploited the quenching of the fluorescence intensity of N-CNDs by Pb2+via the photo-induced electron transfer (PET) mechanism. When applied to real water and herbal medicine samples, the performance of the sensor exhibited no significant difference as compared to the results of the validation method (ICP-OES). Overall, the developed sensors, especially the paper-based one, are promising for the practical analysis of Pb2+ in pharmaceutical and environmental samples with a low Pb2+ concentration.