Selective solid phase extraction of copper using a new Cu(II)-imprinted polymer and determination by inductively coupled plasma optical emission spectroscopy (ICP-OES)

Abstract

This work reports the preparation of a novel Cu(II)-ion imprinted polymer using 2-thiozylmethacrylamide (TMA) for on-line preconcentration of Cu(II) prior to its determination by inductively coupled optical emission spectroscopy (ICP-OES). Cu(II)-TMA monomer (complex) was synthesized and copolymerized via bulk polymerization method in the presence of ethyleneglycoldimethacrylate cross-linker. The resulting polymer was washed with 5% (v/v) HNO3 to remove Cu(II) ions and then with water until a neutral pH. The ion imprinted polymer was characterized by FT-IR and scanning electron microscopy. The experimental conditions were optimized for on-line preconcentration of Cu(II) using a minicolumn of ion imprinted polymer (IIP). Quantitative retention was achieved between pH 5.0 and 6.0, whereas the recoveries for the non-imprinted polymer (NIP) were about 61%. The IIP showed about 30 times higher selectivity to Cu(II) in comparison to NIP. The IIP also exhibited excellent selectivity for Cu(II) against the competing transition and heavy metal ions, including Cd, Co, Cr, Fe, Mn, Ni, Pb and Zn. Computational calculations revealed that the selectivity of IIP was mediated by the stability of Cu(II)-TMA complex which was far more stable than those of Co(II), Ni(II) and Zn(II) that have similar charge and ionic radii to Cu(II). A volume of 10 mL sample solution was loaded onto the column at 4.0 mL min−1 by using a sequential injection system (FIALab 3200) followed by elution with 1.0 mL of 2% (v/v) HNO3. The relative standard deviation (RSD) and limit of detection (LOD, 3s) of the method were 3.2% and 0.4 μg L−1, respectively. The method was successfully applied to determination of Cu(II) in fish otoliths (CRM 22), bone ash (SRM 1400) and coastal seawater and estuarine water samples.

Molecular imprinting: perspectives and applications

“…The main reasons are that operation and instrumentation are easy and simple, and many kinds of solvents and additives can be used for elution without considering their influences on analytical instruments. MISPE is often combined with high performance liquid chromatography (HPLC), 354 gas chromatography (GC), 355 capillary electrophoresis (CE), 356 UV-Vis spectrometry 357 and inductively coupled plasma optical emission spectroscopy (ICP-OES) 358 for the determination of various analytes in environmental (river water, lake water, wastewater, seawater, groundwater, soil extracts, etc. ), food, medicinal plants and biological samples (serum, urine, blood, plasma, etc.…”

Synthesis and characterization of a surface-grafted Cd(II) ion-imprinted polymer for selective separation of Cd(II) ion from aqueous solution

“…As expected, all of the polymers exhibited similar spectral profiles. The intense adsorption band at 1729 cm -1 was assigned to carbonyl groups from EGDMA [38], whereas the adsorption band of C=S was observed at 1393 cm -1 [39,40]. The absorption band at 1465 cm -1 can be assigned to N-C-N stretching vibration [39].…”

Application of central composite design for the optimization of on-line solid phase extraction of Cu2+ by calix[4]arene bonded silica resin

“…A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT 6 The compounds 1-3 were synthesized according to previously reported methods.…”