Journal article

Use of a Polymer Inclusion Membrane and a Chelating Resin for the Flow-Based Sequential Determination of Copper(II) and Zinc(II) in Natural Waters and Soil Leachates

Tania CF Ribas, Charles F Croft, M Ines GS Almeida, Raquel BR Mesquita, Spas D Kolev, Antonio OSS Rangel

Molecules | MDPI AG | Published : 2020


A bi-parametric sequential injection method for the determination of copper(II) and zinc(II) when present together in aqueous samples was developed. This was achieved by using a non-specific colorimetric reagent (4-(2-pyridylazo)resorcinol, PAR) together with two ion-exchange polymeric materials to discriminate between the two metal ions. A polymer inclusion membrane (PIM) and a chelating resin (Chelex 100) were the chosen materials to retain zinc(II) and copper(II), respectively. The influence of the flow system parameters, such as composition of the reagent solutions, flow rates and standard/sample volume, on the method sensitivity were studied. The interference of several common metal ion..

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Awarded by FEDER

Awarded by FCT

Funding Acknowledgements

This work was funded by FEDER through project reference POCI-01-0145-FEDER-031522 (Programa Operacional Competitividade e Internacionalizacao) and by National Funds from FCT (Fundacao para a Ciencia e Tecnologia); scientific collaboration from FCT projects PTDC/AAG-MAA/5887/2014 and UID/Multi/50016/2019 is also acknowledged. T.C.F.R. thanks FEDER and FCT for the grant PTDC/CTA-OHR/31522/2017_BI_1.