期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 207, 期 -, 页码 79-87出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2018.09.002
关键词
Resonance light scattering; Lead; Graphene quantum dots; Diethyldithiocarbamate
类别
资金
- Higher Education Research Promotion and National Research University Project of Thailand, Office of the Higher Education Commission, through the Food and Functional Food Research Cluster of Khon Kaen University
- Post-doctoral Program from Research Affairs and Graduate School, Khon Kaen University [60162]
- Materials Chemistry Research Center, Department of Chemistry
- Center of Excellence for Innovation in Chemistry (PERCH-CIC), Thailand
This study was aimed to detect Pb2+ using diethyl dithiocarbamate-doped graphene quantum dots (DDTC-GQDs) based pyrolysis of citric acid. The excitation maximum wavelength (lambda(max), ex = 337 nm) of the DDTC-GQDs solution was blue shift from bare GQDs (lambda(max), ex = 365 nm), with the same emission maximum wavelength (lambda(max), em = 459 nm) indicating differences in the desired N, S matrices decorating in the nanoparticles. Their resonance light scattering intensities were peaked at the same lambda(max), ex/em = 551/553 nm without any background effect of both ionic strength and masking agent. Under optimal conditions, the linear range was 1.0-10.0 mu g L-1 (R-2 = 0.9899), limit of detection was 0.8 mu g L-1 and limit of quantification was 1.5 mu g L-1. The precision, expressed as the relative standard deviations, for infra-day and inter-day analyses was 0.87% and 4.47%, respectively. The recovery study of Pb2+ for real water samples was ranged between 80.8% and 109.5%. The proposed method was also proved with certified water sample containing 60 mu g L-1 Pb2+ giving an excellent accuracy and was then implied satisfactorily for ultra-trace determination of Pb2+ in drinking water and tap water samples. (C) 2018 Elsevier B.V. All rights reserved.
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