User:Michaela Harper/Notebook/Biological Chemistry Lab/2012/03/20

Determining Gold Concentration: Electrochemistry

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Objective To determine the concentration of Au+3 left unreacted in solution in the fiber solutions using electrochemistry. Description Make the following dilutions of chloroauric acid to create a calibration curve: 5.00 mM 1.00 mM 500 μM 100 μM 50.0 μM 10.0 μM 5.00 μM 1.00 μM 500 nM 100 nM Add 0.1 mL of 0.5 mM aqueous KNO3 to each solution. Use cyclic voltammetry with two glassy carbon electrodes (0.35 cm2), scanning from -0.5 V to 1.7 V and returning to -0.8 V for each solution. Data Graph of current vs applied potential of each dilution of Au+3: Notes Detection limit for glassy carbon electrodes is not low enough to determine concentration of Au3+ in fiber solution.