A Polymer Inclusion Membrane for Sensing Metal Complexation in Natural Waters

Metal speciation studies are of great importance in assessing metal bioavailability in aquatic environments. Functionalized membranes are a simple tool to perform metal chemical speciation. In this study, we have prepared and tested a polymer inclusion membrane (PIM) made of the polymer cellulose tr...

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Bibliographic Details
Published in:Applied sciences 2021-11, Vol.11 (21), p.10404
Main Authors: Alcalde, Berta, Anticó, Enriqueta, Fontàs, Clàudia
Format: Article
Language:English
Subjects:
Accumulation
Acetic acid
Acids
Aquatic environment
Bioavailability
Cellulose
Cellulose triacetate
Chemical speciation
Complexation
Ethylenediaminetetraacetic acids
Humic acids
Hydroxyapatite
Ligands
Membranes
metal complexation
Metal ions
Metals
Natural waters
Phosphoric acid
polymer inclusion membrane
Polymers
Polyvinyl chloride
Reagents
river water
Rivers
Sensors
Solvents
Speciation
Water pollution
Zinc
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Summary:Metal speciation studies are of great importance in assessing metal bioavailability in aquatic environments. Functionalized membranes are a simple tool to perform metal chemical speciation. In this study, we have prepared and tested a polymer inclusion membrane (PIM) made of the polymer cellulose triacetate (CTA), the extractant di-(2-ethylhexyl) phosphoric acid (D2EHPA), and the plasticizer 2-nitrophenyloctyl ether (NPOE) as a sensor for Zn and Cu complexation studies. This PIM, incorporated in a device with an 0.01 M HNO3 receiving solution, is shown to effectively transport free metal ions, and it is demonstrated that the presence of ligands that form stable complexes with divalent metallic ions, such as ethylenediaminetetraacetic acid (EDTA) and humic acid (HA), greatly influences the accumulation of the metals in the receiving phase due to the increasing metal fraction complexed in the feed phase. Moreover, the effect of major ions found in natural waters has been investigated, and it is found that the presence of calcium did not decrease the accumulation of either Zn or Cu. Finally, the PIM sensor has been used successfully to evaluate metal complexation in a river water affected by Zn pollution.
ISSN:2076-3417
2076-3417
DOI:10.3390/app112110404