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

Página do item simplificado
dc.contributor.authorMiranda-Andrades J.R.
dc.contributor.authorLetichevsky S.
dc.contributor.authorGonzalez Larrude D.R.
dc.contributor.authorAucelio R.Q.
dc.date.accessioned2024-03-12T23:47:02Z
dc.date.available2024-03-12T23:47:02Z
dc.date.issued2020
dc.description.abstract© 2020 Elsevier B.V.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 photodegradation 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.
dc.description.firstpage256
dc.description.lastpage268
dc.description.volume1127
dc.identifier.doi10.1016/j.aca.2020.06.048
dc.identifier.issn1873-4324
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/34928
dc.relation.ispartofAnalytica Chimica Acta
dc.rightsAcesso Restrito
dc.subject.otherlanguageCold vapor atomic spectrometry
dc.subject.otherlanguageGraphene quantum dots
dc.subject.otherlanguageMercury speciation
dc.subject.otherlanguageReaction kinetic
dc.subject.otherlanguageTiO2 nanoparticles
dc.subject.otherlanguageUrine analysis
dc.titlePhoto-generation of mercury cold vapor mediated by graphene quantum dots/TiO2 nanocomposite: On line time-resolved speciation at ultra-trace levels
dc.typeArtigo
local.scopus.citations7
local.scopus.eid2-s2.0-85087864729
local.scopus.subjectAtomic fluorescence spectrometry
local.scopus.subjectAtomic spectrometry
local.scopus.subjectLimits of detection
local.scopus.subjectMercury speciations
local.scopus.subjectNanocomposite dispersions
local.scopus.subjectPhotochemical reactor
local.scopus.subjectPhotodegradation kinetics
local.scopus.subjectUltra-trace levels
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85087864729&origin=inward
Arquivos
Coleções
Artigos de periódico