Standard addition curves are not reproducible, 10 na, 1 μa – Metrohm 797 VA Computrace User Manual
Page 276: 10 μa, 9 troubleshooting, Highest current range, Lowest current range, 797 va computrace – software
9 Troubleshooting
797 VA Computrace – Software
264
Example:
(For all measurements: Amplitude: 0.02 V , Frequency: 50 Hz)
Highest current range
: 10
nA
Lowest current range
: 10 nA
Zn/Cd/Pb/Cu-Determination/DIN-Puffer/SqW
Test Si_kap_nullserie
-1.00
-0.80
-0.60
-0.40
-0.20
0.00
U (V)
120n
140n
160n
180n
I (
A
)
Cd
Cu
Pb
Zn
Highest current range
: 1
μA
Lowest current range
: 1 μA
Zn/Cd/Pb/Cu-Determination/DIN-Puffer/SqW
Test Si_kap_nullserie
-1.00
-0.80
-0.60
-0.40
-0.20
0.00
U (V)
0
20.0n
40.0n
60.0n
80.0n
100n
120n
I (
A
)
Cd
Zn
Cu
Pb
Highest current range
: 10
μA
Lowest current range
: 10 μA
Zn/Cd/Pb/Cu-Determination/DIN-Puffer/SqW
Test Si_kap_nullserie
-1.00
-0.80
-0.60
-0.40
-0.20
0.00
U (V)
0
20.0n
40.0n
60.0n
80.0n
100n
120n
I (
A
)
Zn
Cu
Pb
Cd
Standard addition curves are not reproducible
With all types of electrodes:
1. Check method parameters (stirring time, etc.).