Photo-generation of mercury cold vapor mediated by graphene quantum dots/TiO2 nanocomposite: On line time-resolved speciation at ultra-trace levels

被引：8

作者：

Miranda-Andrades, Jarol R. ^{[1
]}

Letichevsky, Sonia ^{[2
]}

Gonzalez Larrude, Dunieskys R. ^{[3
]}

Aucelio, Ricardo Q. ^{[1
]}

机构：

[1] Pontifical Catholic Univ Rio De Janeiro, Dept Chem, BR-22451900 Rio De Janeiro, Brazil

[2] Pontifical Catholic Univ Rio De Janeiro, Dept Chem Engn & Mat, BR-22451900 Rio De Janeiro, Brazil

[3] Univ Prebiteriana Mackenzie, MackGraphe Graphene & Nanomat Res Ctr, Sao Paulo, Brazil

来源：

ANALYTICA CHIMICA ACTA | 2020年 / 1127卷 / 1127期

关键词：

Mercury speciation; Reaction kinetic; Graphene quantum dots; TiO2; nanoparticles; Cold vapor atomic spectrometry; Urine analysis; ATOMIC FLUORESCENCE SPECTROMETRY; GAS-CHROMATOGRAPHY; ABSORPTION-SPECTROMETRY; PHOTOCATALYTIC ACTIVITY; INORGANIC MERCURY(II); SILVER NANOPARTICLES; MASS SPECTROMETRY; NATURAL-WATER; DOTS; FISH;

D O I：

10.1016/j.aca.2020.06.048

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Mercury speciation was achieved using a nanocomposite, consisting of graphene quantum dots (GQDs) and TiO2 nanoparticles, to mediate photo-degradation of mercurial species into the Hg cold vapor detected by atomic spectrometry. Sample solution (containing Hg2+, CH3CH2Hg, and CH3Hg at hundreds of ng L-1) was placed in quartz tube containing formic acid solution (2% v/v) and microliter aliquot of GQDs/TiO2 nanocomposite dispersion (0.6 mg of nanocomposite). The tube was placed inside a photochemical reactor then, adapted to the mercury-dedicated spectrometer. Quantitative speciation was achieved taking advantage of the differences in UV photo-degradation kinetics: Hg2+ (5 min), CH3CH2Hg (9 min) and CH3Hg (13 min). Gas-chromatography cold vapor atomic fluorescence spectrometry was used to confirm the evolution of the reactions over time during photo-reaction. The limits of detection were 10 ng L-1 for CH3CH2Hg and 7 ng L-1 for Hg2+ and CH3Hg. (C) 2020 Elsevier B.V. All rights reserved.

引用

页码：256 / 268

页数：13

共 1 条

[1] Thiomersal determination in vaccines using graphene quantum dots-TiO2 nanocomposite to promote temporally selective photo-production of Hg cold vapor
Miranda-Andrades, Jarol R.
Pedrozo-Penafiel, Marlin J.
Mendes, Joseane A.
Aucelio, Ricardo Queiroz
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, 2022, 194

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