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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.

Equipment Required:
  • Titration flask (125 ml)
  • 10 ml Automatic pipette
  • Digital titrator
Reagents Required:
  • Deionized water
  • pH 9.5 Buffer
  • PAN indicator
  • .800M EDTA tetrasodium salt (titrant)
  1. Measure 50 ml of heated deionized water into the titration flask. (about 40°C, 104°F will yield optimum results)
  2. Using a pipette, add .50 ml of sample etchant (5 charges from automatic pipettor).
  3. 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.
  4. Add 2 drops of PAN indicator to yield a bright violet solution. Swirl flask to mix thoroughly.
  5. 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.
  6. 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
The acceptable range of NumCop is:
Cu Optimum Range : 17 to 23 (grams/Liter)
(or 8 to 12 oz./gal. [60 to 90 g/L] of copper sulfate)
NumCop: 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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