User:Elaine Marie Robbins/Notebook/CHEM-496/2012/03/20

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Determining Au+3 Concentration Main project page
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Objective

To determine the concentration of Au+3 left unreacted in solution in the fiber solution synthesized on 02/29/12 using electrochemistry.

Description

  1. Make the following dilutions of chloroauric acid:
    • 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
  2. Add 0.5 mL of 0.5 M KNO3 to each solution.
  3. Run cyclic voltammetry using glassy carbon electrodes as both working and reference electrodes.

Data

  • Graph of current vs applied potential of each dilution of Au+3:
Image:Current vs applied potential 3-20-12.png

Notes

Detection limit for glassy carbon electrodes is not low enough to determine concentration of Au+3 in fiber solution.



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