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Nitrocellulose membrane-poly (vinyl alcohol)-ionic imprinting (NCM-PVA-I-I) was prepared using Cu 2+ as template. The cavity in NCM-PVA-I-I matched Cu 2+ very well and the selectivity was high. Cu 2+ entered the cavity and then could form ionic association ([Cu 2+ ]·[(Fin − ) 2 ]) with the anion of fluorescein (Fin − ) outside the cavity by electrostatic...
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