An electrochemical flow-cell for permanent modification of graphite tube with palladium for mercury determination by electrothermal atomic absorption spectrometry

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dc.contributor.authorMoreno R.G.M.
dc.contributor.authorDe Oliveira E.
dc.contributor.authorPedrotti J.J.
dc.contributor.authorOliveira P.V.
dc.date.accessioned2024-03-13T01:46:30Z
dc.date.available2024-03-13T01:46:30Z
dc.date.issued2002
dc.description.abstractAn electrochemical procedure for palladium deposition on the inner surface of pyrolytic graphite-coated tubes for permanent chemical modification and a cold vapor generation system for the pre-concentration and determination of mercury trace levels in rain, potable, and non-potable water and lake sediment by electrothermal atomic absorption spectrometry is proposed. A tubular electrochemical flow-cell was assembled on the original geometry of the graphite tube, which operated as the working electrode. A stainless steel tube, positioned downstream from the working electrode, was used as the auxiliary electrode. The applied potential was measured against a micro Ag/AgCl(sat) reference electrode inserted in the auxiliary electrode. Palladium solution in acetate buffer (100 mmol l-1, pH=4.8), flowing at 0.5 ml min-1 for 60 min was used to perform the electrodeposition. A homemade cold vapor generation system composed of a peristaltic pump, an injector-commutator, a flow meter and a disposable polyethylene gas-liquid separator flask (approx. 4.0 ml volume) were used. Volumes of 1.0 ml of reagent (2.0% w/v NaBH4 in 0.10 mol l-1 of NaOH) and 1.0 ml of reference or sample solution in 0.25 mol l-1 of HNO3 were carried to the gas-liquid separator using the peristaltic pump. The mercury vapor was carried out to the modified graphite tube by argon flow (200 ml min-1), and pre-concentrated for 120 s. The characteristic mass for 1.0 ml of reference solution was 26 pg (R.S.D.=0.12%, n=5). The detection limit obtained was 93 pg (n=20, 3δ). The reliability of the entire procedure was confirmed by addition and recovery tests and cold vapor atomic absorption spectrometry. © 2002 Elsevier Science Ltd. All rights reserved.
dc.description.firstpage769
dc.description.issuenumber4
dc.description.lastpage778
dc.description.volume57
dc.identifier.doi10.1016/S0584-8547(02)00009-5
dc.identifier.issn0584-8547
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/38011
dc.relation.ispartofSpectrochimica Acta - Part B Atomic Spectroscopy
dc.rightsAcesso Restrito
dc.subject.otherlanguageElectrodeposition
dc.subject.otherlanguageGraphite furnace
dc.subject.otherlanguageMercury determination
dc.subject.otherlanguagePermanent chemical modifier
dc.titleAn electrochemical flow-cell for permanent modification of graphite tube with palladium for mercury determination by electrothermal atomic absorption spectrometry
dc.typeArtigo
local.scopus.citations23
local.scopus.eid2-s2.0-0037023112
local.scopus.subjectAtomic absorption spectrometry
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0037023112&origin=inward
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