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Concentration curve of differential pulse voltammetry reacted Fe-HA (50 μM) with variable HA spiked urine sample concentration ranging from 0.001 to 1.0 mg/mL at 0.35 V. Inset: DPV of Fe-HA (50 μM) with variable HA concentration ranging from 0.001 to 1.0 mg/mL.
