Flow injection analysis of ethyl xanthate by gas diffusion and UV detection as CS2 for process monitoring of sulfide ore flotation

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dc.contributor.authorCordeiro T.G.
dc.contributor.authorHidalgo P.
dc.contributor.authorGutz I.G.R.
dc.contributor.authorPedrotti J.J.
dc.date.accessioned2024-03-13T01:31:21Z
dc.date.available2024-03-13T01:31:21Z
dc.date.issued2010
dc.description.abstractA sensitive and robust analytical method for spectrophotometric determination of ethyl xanthate, CH3CH2OCS 2 - at trace concentrations in pulp solutions from froth flotation process is proposed. The analytical method is based on the decomposition of ethyl xanthate, EtX-, with 2.0 mol L-1 HCl generating ethanol and carbon disulfide, CS2. A gas diffusion cell assures that only the volatile compounds diffuse through a PTFE membrane towards an acceptor stream of deionized water, thus avoiding the interferences of non-volatile compounds and suspended particles. The CS2 is selectively detected by UV absorbance at 206 nm (ε = 65,000 L mol -1 cm-1). The measured absorbance is directly proportional to EtX- concentration present in the sample solutions. The Beer's law is obeyed in a 1 × 10-6 to 2 × 10-4 mol L-1 concentration range of ethyl xanthate in the pulp with an excellent correlation coefficient (r = 0.999) and a detection limit of 3.1 × 10-7 mol L-1, corresponding to 38 μg L -1. At flow rates of 200 μL min-1 of the donor stream and 100 μL min-1 of the acceptor channel a sampling rate of 15 injections per hour could be achieved with RSD < 2.3% (n = 10, 300 μL injections of 1 × 10-5 mol L-1 EtX-). Two practical applications demonstrate the versatility of the FIA method: (i) evaluation the free EtX- concentration during a laboratory study of the EtX- adsorption capacity on pulverized sulfide ore (pyrite) and (ii) monitoring of EtX- at different stages (from starting load to washing effluents) of a flotation pilot plant processing a Cu-Zn sulfide ore. © 2010 Elsevier B.V. All rights reserved.
dc.description.firstpage790
dc.description.issuenumber2
dc.description.lastpage795
dc.description.volume82
dc.identifier.doi10.1016/j.talanta.2010.05.055
dc.identifier.issn0039-9140
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/37174
dc.relation.ispartofTalanta
dc.rightsAcesso Aberto
dc.subject.otherlanguageEthyl xanthate
dc.subject.otherlanguageFlotation process
dc.subject.otherlanguageFlow analysis
dc.subject.otherlanguageGas-diffusion
dc.subject.otherlanguageMining industry
dc.subject.otherlanguageSpectrophotometry
dc.titleFlow injection analysis of ethyl xanthate by gas diffusion and UV detection as CS2 for process monitoring of sulfide ore flotation
dc.typeArtigo
local.scopus.citations20
local.scopus.eid2-s2.0-77955316853
local.scopus.subjectCorrelation coefficient
local.scopus.subjectEthyl xanthate
local.scopus.subjectFlotation process
local.scopus.subjectFlow analysis
local.scopus.subjectFroth flotation process
local.scopus.subjectGas diffusion
local.scopus.subjectRobust analytical methods
local.scopus.subjectSpectrophotometric determination
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=77955316853&origin=inward
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