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dc.contributor.authorMorales-Benítez, Irene
dc.contributor.authorGarcía-Mesa, Juan Carlos
dc.contributor.authorMontoro-Leal, Pablo
dc.contributor.authorLópez-Guerrero, María del Mar 
dc.contributor.authorVereda-Alonso, Elisa Isabel 
dc.date.accessioned2021-01-08T08:49:58Z
dc.date.available2021-01-08T08:49:58Z
dc.date.created2020
dc.date.issued2021-01-08
dc.identifier.urihttps://hdl.handle.net/10630/20668
dc.descriptionSHOTGUN PRESENTATIONes_ES
dc.description.abstractIn this work, a new double-reactor method for the analysis and speciation of trace amounts of Cr(III)/Cr(VI) ions in environmental samples has been developed combining on-line magnetic solid phase extraction (MSPE) with inductively coupled plasma optical emission spectrometry (ICP OES). For the preconcentration and speciation of Cr, a new magnetic graphene oxide (MGO) functionalized with p-sulfanilic acid has been syhthesized. This material presents good capacity of adsorption towards Cr(III) and Cr(VI) species. The FI manifold used for on-line preconcentration and elution is shown in Fig.1. The eight-port valve (V) was changed from position A-B, and vice versa allowing the load of sample of the two reactors (R1 and R2) followed of the elution of Cr(VI) with NH3 3.2 % in R1 and total Cr with HNO3 2.3 % in R2 to ICP-OES. Subtracting the signal of Cr (VI) to the signal of Cr(III)+Cr(VI), both ions can be determined. Moreover, several flow and chemical variables were optimized by two multivariate central composite designs (CCD). The optimized method offers good sensitivity and precision. The accuracy of the proposed method was verified using certified reference materials. The obtained results were in good agreement with the certified values and high recoveries were achieved for the spiked samples. Thus, the new adsorbent has demonstrated to be useful for the preconcentration and speciation of Cr(III)/Cr(VI).es_ES
dc.description.sponsorshipUniversidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. Fondos FEDER y Junta de Andalucía Proyecto UMA18-FEDERJA-060. Plan Propio. Proyecto Puente. Universidad de Málagaes_ES
dc.language.isoenges_ES
dc.rightsinfo:eu-repo/semantics/openAccesses_ES
dc.subjectExtracción (Química)es_ES
dc.subjectReactores químicoses_ES
dc.subject.otherSpeciationes_ES
dc.subject.otherChromiumes_ES
dc.subject.otherMagnetic graphene oxidees_ES
dc.subject.otherMSPE-ICP-OESes_ES
dc.titleDevelopment of an on-line MSPE-ICP-OES method for the preconcentration and speciation of Cr(III)/Cr(VI) in aqueous sampleses_ES
dc.typeinfo:eu-repo/semantics/conferenceObjectes_ES
dc.centroFacultad de Cienciases_ES
dc.relation.eventtitle4 th International Caparica Christmas Conference on Sample Treatment 2020es_ES
dc.relation.eventplaceCaparica (Portugal)es_ES
dc.relation.eventdateDel 30/11/2020 al 03/12/2020es_ES


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