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Selectivity study: (a) current potential (I-V) response of the bare and coated GCE (ATNA/Nafion/GCE) in the presence and absence of Cr3+ ions as our target analyte at 0.1 µM, 25.0 µL; (b) I-V response with various analytes (showing affinity with Cr3+), concentration of each analyte was taken at (0.1 µM, 25.0 µL).
