期刊
MICROCHEMICAL JOURNAL
卷 114, 期 -, 页码 65-72出版社
ELSEVIER
DOI: 10.1016/j.microc.2013.12.002
关键词
Cu(II)-imprinted polymer; Solid phase extraction; Seawater; Bone ash; Fish otolith; Inductively coupled optical emission spectroscopy
资金
- National Center for Research Resources [5 G12 RR013459-15]
- National Institute on Minority Health and Health Disparities [8 G12 MD007581-15]
- Research Initiative for Scientific Enhancement from the National Institutes of Health [2 R25 GM067122]
- Turkish Higher Education Council (YOK)
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 online 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, 3 s) of the method were 3.2% and 0.4 mu g 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. (C) 2013 Elsevier B.V. All rights reserved.
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