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Acid-Copper Electroplating Module Model 1000 Manual
Chemical Analysis - Copper Concentration Analysis I
Copper Concentration Analysis
If you have not done so, please read the "DOs and DON´Ts" section now.
- Titration flask (125 ml)
- 10 ml Automatic pipette
- Digital titrator
- Deionized water
- pH 9.5 Buffer
- PAN indicator
- .800M EDTA tetrasodium salt (titrant)
The acceptable range of NumCop is:
- Measure 50 ml of heated deionized water into the titration flask. (about
40°C, 104°F will yield optimum results)
- Using a pipette, add .50 ml of sample etchant (5 charges from automatic pipettor).
- Add the pH 9.5 buffer one drop at a time until the solution turns a light
blue or violet color (two or three drops max.). This point is rather
subtle so watch for it closely.
- Add 2 drops of PAN indicator to yield a bright violet solution. Swirl flask to
- Using the digital titrator, titrate with the .800M EDTA tetrasodium salt to a
green (or yellow-green) end point. Record the number of drops of titrant
from the digital indicator.
- The concentration of dissolved copper present (as cupric ion in grams per
liter (g/L)) can be directly calculated using (digital titrator reading
for copper analysis is denoted NumCop):
Copper concentration (g/L) = 0.127 x NumCop
|Cu Optimum Range :
||17 to 23 (grams/Liter)
|(or 8 to 12 oz./gal. [60 to 90 g/L] of copper sulfate)
||136 to 181
In normal operation (after the bath stabilizes through regular use), the copper
concentration will never be outside the acceptable range.
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