Method

PSA (Cd)

CCSA (Cu)

Working electrode

Mercury film

Gold disk electrode

Deposition potential

−1200

−350

Versus Ag/AgCl 3M (mV)

Angular velocity (rpm)

4130

4130

Deposition time (min.)

15

5

Stripping

Chemical oxidation

Applied current of 2 μA

Reproducibility (n = 9)

4% (at 0.1 nM level)

2% (at 3.1 nM level)

Precision (n = 6)

7%

4%

Detection limit

0.01

0.017