scholarly journals System for mercury preconcentration in natural waters based on a polymer inclusion membrane incorporating an ionic liquid

2019 ◽  
Vol 371 ◽  
pp. 316-322 ◽  
Author(s):  
Gemma Elias ◽  
Sergi Díez ◽  
Clàudia Fontàs
Keyword(s):  
Ionic Liquid ◽  
Natural Waters ◽  
Inclusion Membrane ◽  
Polymer Inclusion Membrane

scholarly journals A Polymer Inclusion Membrane for Sensing Metal Complexation in Natural Waters

2021 ◽  
Vol 11 (21) ◽  
pp. 10404
Author(s):  
Berta Alcalde ◽  
Enriqueta Anticó ◽  
Clàudia Fontàs
Keyword(s):  
Natural Waters ◽  
Ethylenediaminetetraacetic Acid ◽  
Major Ions ◽  
Metal Speciation ◽  
Cellulose Triacetate ◽  
Metal Complexation ◽  
Metallic Ions ◽  
Inclusion Membrane ◽  
Polymer Inclusion Membrane ◽  
Free Metal

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.

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