RT Conference Proceedings
T1 Development of an on-line MSPE-ICP-OES method for the preconcentration and speciation of Cr(III)/Cr(VI) in aqueous samples
A1 Morales-Benítez, Irene
A1 García-Mesa, Juan Carlos
A1 Montoro-Leal, Pablo
A1 López-Guerrero, María del Mar
A1 Vereda-Alonso, Elisa Isabel
K1 Extracción (Química)
K1 Reactores químicos
AB In this work, a new double-reactor method for the analysis and speciation of trace amounts ofCr(III)/Cr(VI) ions in environmental samples has been developed combining on-line magnetic solidphase 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 ofadsorption towards Cr(III) and Cr(VI) species. The FI manifold used for on-line preconcentrationand elution is shown in Fig.1. The eight-port valve (V) was changed from position A-B, and vice versaallowing the load of sample of the two reactors (R1 and R2) followed of the elution of Cr(VI) withNH3 3.2 % in R1 and total Cr with HNO3 2.3 % in R2 to ICP-OES. Subtracting the signal of Cr (VI) tothe signal of Cr(III)+Cr(VI), both ions can be determined. Moreover, several flow and chemicalvariables were optimized by two multivariate central composite designs (CCD). The optimizedmethod offers good sensitivity and precision. The accuracy of the proposed method was verifiedusing certified reference materials. The obtained results were in good agreement with the certifiedvalues and high recoveries were achieved for the spiked samples. Thus, the new adsorbent hasdemonstrated to be useful for the preconcentration and speciation of Cr(III)/Cr(VI).
YR 2021
FD 2021-01-08
LK https://hdl.handle.net/10630/20668
UL https://hdl.handle.net/10630/20668
LA eng
NO SHOTGUN PRESENTATION
NO Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.Fondos FEDER y Junta de Andalucía Proyecto UMA18-FEDERJA-060.Plan Propio. Proyecto Puente. Universidad de Málaga
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026