Peat as a natural solid-phase for copper preconcentration and determination in a multicommuted flow system coupled to flame atomic absorption spectrometry

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dc.contributor.authorGonzales A.P.S.
dc.contributor.authorFirmino M.A.
dc.contributor.authorNomura C.S.
dc.contributor.authorRocha F.R.P.
dc.contributor.authorOliveira P.V.
dc.contributor.authorGaubeur I.
dc.date.accessioned2024-03-13T01:35:04Z
dc.date.available2024-03-13T01:35:04Z
dc.date.issued2009
dc.description.abstractThe physical and chemical characteristics of peat were assessed through measurement of pH, percentage of organic matter, cationic exchange capacity (CEC), elemental analysis, infrared spectroscopy and quantitative analysis of metals by ICP OES. Despite the material showed to be very acid in view of the percentage of organic matter, its CEC was significant, showing potential for retention of metal ions. This characteristic was exploited by coupling a peat mini-column to a flow system based on the multicommutation approach for the in-line copper concentration prior to flame atomic absorption spectrometric determination. Cu(II) ions were adsorbed at pH 4.5 and eluted with 0.50 mol L-1 HNO3. The influence of chemical and hydrodynamic parameters, such as sample pH, buffer concentration, eluent type and concentration, sample flow-rate and preconcentration time were investigated. Under the optimized conditions, a linear response was observed between 16 and 100 μg L-1, with a detection limit estimated as 3 μg L-1 at the 99.7% confidence level and an enrichment factor of 16. The relative standard deviation was estimated as 3.3% (n = 20). The mini-column was used for at least 100 sampling cycles without significant variation in the analytical response. Recoveries from copper spiked to lake water or groundwater as well as concentrates used in hemodialysis were in the 97.3-111% range. The results obtained for copper determination in these samples agreed with those achieved by graphite furnace atomic absorption spectrometry (GFAAS) at the 95% confidence level. © 2009 Elsevier B.V. All rights reserved.
dc.description.firstpage198
dc.description.issuenumber2
dc.description.lastpage204
dc.description.volume636
dc.identifier.doi10.1016/j.aca.2009.01.047
dc.identifier.issn0003-2670
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/37382
dc.relation.ispartofAnalytica Chimica Acta
dc.rightsAcesso Restrito
dc.subject.otherlanguageCopper
dc.subject.otherlanguageFlow analysis
dc.subject.otherlanguageMulticommutation
dc.subject.otherlanguagePeat
dc.subject.otherlanguagePreconcentration
dc.titlePeat as a natural solid-phase for copper preconcentration and determination in a multicommuted flow system coupled to flame atomic absorption spectrometry
dc.typeArtigo
local.scopus.citations294
local.scopus.eid2-s2.0-60949094135
local.scopus.subjectBuffer concentrations
local.scopus.subjectCationic exchange capacities
local.scopus.subjectConfidence levels
local.scopus.subjectCopper concentrations
local.scopus.subjectCopper determinations
local.scopus.subjectDetection limits
local.scopus.subjectElemental analysis
local.scopus.subjectEluent types
local.scopus.subjectEnrichment factors
local.scopus.subjectFlame atomic absorption spectrometric determinations
local.scopus.subjectFlame atomic absorption spectrometries
local.scopus.subjectFlow analysis
local.scopus.subjectFlow systems
local.scopus.subjectFlow-rate
local.scopus.subjectGraphite-furnace atomic absorption spectrometries
local.scopus.subjectHydrodynamic parameters
local.scopus.subjectICP-OES
local.scopus.subjectIn lines
local.scopus.subjectLake waters
local.scopus.subjectLinear response
local.scopus.subjectMulticommutation
local.scopus.subjectOptimized conditions
local.scopus.subjectOrganic matters
local.scopus.subjectPhysical and chemical characteristics
local.scopus.subjectPreconcentration
local.scopus.subjectPreconcentration time
local.scopus.subjectQuantitative analysis
local.scopus.subjectRelative standard deviations
local.scopus.subjectRetention of metals
local.scopus.subjectSample pH
local.scopus.subjectSolid-phase
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=60949094135&origin=inward
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