Instruction Manual

8.6 Analyze Electroplating Bath Solutions
797 VA Computrace – Software
221
3. Define the No. of additions on the Determination
tab of the EDIT WORKING METHOD PARAME-
TERS
window.
4. Place the "Bath solution" into the sample vesse-
land click start. Q(Bath) is determined.
5. Add Brightener standard solution several times
and measure Q(addition) for each addition. Nor-
mally, two or three standard additions should be
done for the brightener determination.
Note: If you make several measurements of bath solutions
with the same composition, you can do the actual determi-
nation of the "Bath solution" several times with the same
"Intercept value". However, the "ntercept value" sould be
redetermined in regular intervals.
For Suppressor analyses:
Dilution Titration Technique
"DT Suppressors with calibration curve", and "DT Record calibra-
tion curve" to record the calibration curve.
The "Dilution Titration Technique" is used for the determination
of Suppressors. It consists of two measurement parts:
A. “DT Record calibration curve”
This Calibration technique is used to record the calibration
curve and determine the “Calibration factor” with addition
of a standard solution containing a known Suppressor con-
centration.
Typical standard addition scheme for DT Record calibration
curve:
1. Define "Addition ratio" and "Evaluation ratio" on the
Substances tab of the EDIT WORKING METHOD PA-
RAMETERS
window.
2. Place the VMS (Virgin Make-up Solution) into the
sample vessel and click on start. Q(0) is determined.
3. Add Suppressor standard solution and measure
Q(addition) for each addition, until Q/Q(0) < "Additi-
on ratio". If the "Addition ratio" is reached with less
than 5 or more than 20 additions, the concentration
of the Suppressor standard solution or the addition
volume should be adjusted.
B. "DT Suppressors with calibration curve"
This
Calibration technique is used to determine the Suppres-
sor concentration. The scheme is similar to "DT Record cali-
bration curve", except that not standard solution, but Pro-
duction bath solution is added to the VMS.