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A solid phase extraction (SPE) procedure for the simultaneous separation and preconcentration of trace amounts of nickel (Ni2+), copper (Cu2+) and Zinc (Zn2+) ions on Ag nanoparticle-loaded activated carbon(Ag-NP-AC) sorbent modified by (2-nitrobenzylidene)-2-(2-(2-nitrophenyl)imidazolidine-1-yl) ethaneamine (NBNPIEA) was applied. The chelating agents were used as efficient accumulating agents, which...