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13 Dec 2019

In cyclic voltammetry, working electrode potential is scanned from negative to positive direction. Why the current does not increase linearly with the increase of potential (Ohm's law)? In fact, a peak of current is observed

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Casey Durgan
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17 Dec 2019

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Related questions

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True False In both potential-step and cyclic voltammetry experiments, Faradaic current varies with the square root of redox-couple concentration.
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Please do not attempt if you are unsure I have one try left for this homework set!

Thioamide drugs can be determined quantitatively by cathodic stripping analysis. Deposition occurs at versus the . During the stripping step, the potential is scanned cathodically, and a stripping peak is observed at . In a typical application, a sample of urine was mixed with of a pH buffer. Following a deposition, a peak current of  was measured. A addition of a solution of the thioamide drug was added to the same solution. A peak current of was recorded following the same deposition time. Report the drug’s molar concentration in the urine sample.

The concentration of Cu2+ in seawater is determined by anodic stripping voltammetry at a hanging mercury drop electrode after first releasing any copper bound to organic matter. To a 25.00-mL sample of seawater 1 mL of 0.5 M HNO3 and 1 mL of 0.1% H2O2 are added. The sample is irradiated with UV light for 6 hr and then diluted to volume in a 50-mL volumetric flask. Deposition of Cu2+ takes place at –0.45 V versus an SCE for 10 min, producing a peak current of 22.5 (arbitrary units). A second 25.00-mL sample of the seawater is treated identically, except that 0.5 mL of a 10.00 μM solution of Cu2+ is added, producing a peak current of 32.1 (arbitrary units). What is the concentration of Cu2+ in seawater?

0.468 µM

0.365 µM

1.652 µM

1.352 µM

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