Iron(II) ion imprinted polymer for Fe(II)/Fe(III) speciation in wine

Abstract

In this paper, we proposed a procedure for the determination of Fe(III) and total Fe(II)+Fe(III) in wine samples employing newly synthesized Fe(II) ion imprinted polymer (Fe(II)-IIP) as a sorbent incorporated in dispersive solid phase extraction. Cross-linked precipitation copolymerization using 4-vinylpyridine (functional monomer), trimethylolpropane trimethacrylate (cross-linking agent) and 2,2′-bipyridyl as a specific for Fe(II) ligand was used for the synthesis of Fe(II)-IIP. The optimization experiments showed quantitative sorption of both Fe(II) and Fe(III) on the surface of Fe(II)-IIP at pH 7, however selective sorption of only Fe(II) could be achieved in the presence of fluoride ions as a masking agent for Fe(III). The Langmuir adsorption isotherm best described the adsorption of Fe(II) on the surface of the sorbent on the at least two kinds of binding sites with higher and lower affinities as defined by Scatchard plot. The analytical procedure developed allows the determination of iron(III) and total Fe(II)+Fe(III) in wine samples, with limits of quantification 0.1 mg L-1. The relative standard deviation varied in the range 3-7% for Fe content 0.1-10 mg L-1 .

Adsorption Behavior of Fe(II) and Fe(III) Ions on Polyaniline Coated Sawdust: Batch and Fixed–Bed Studies

“…Additionally, the proposed method can handle reasonable sample volume, and has less normalized extraction time than other methods. 9,[52][53][54][55][56][57][58][59] Normalized extraction time is defined as the time required to extract 1.0 mg of the adsorbate by 1.0 g of the adsorbent. It is worth noting that the efficiency of raw sawdust was checked toward the removal of iron ions.…”

Synthesis of copper(II) ion‐imprinted polymers via suspension polymerization

“…The synthesis of metal ion‐imprinted polymer (MIIP) materials for various metal ions such as K + , Li + , Ag + , Cd 2+ , Co 2+ , Cu 2+ , Fe 2+ , Hg 2+ , Ni 2+ , Pb 2+ , Zn 2+ , and rare earth elements has been reported in many publications . For example, Mitreva et al developed Fe 2+ ion‐imprinted polymers as a sorbent incorporated in dispersive SPE for the determination of Fe 2+ and Fe 3+ in wine samples . This newly designed Fe‐IIP sorbent exhibits high selectivity.…”

Selective Separation and Preconcentration of Thorium(IV) in Bastnaesite Ore Using Thorium(IV)-Imprinted Cryogel Polymer

“…This technique is used in many applications such as selectivity recognation and seperation [26][27][28][29], drug delivery systems [30][31], catalysis [32,33] sensor technology [34,35]. In addition, ion imprinted polymers (IIPs) have been used for the selective removal of metal ions from different matrices [36][37][38][39][40][41][42][43][44][45][46][47].…”