Quantitative determination of copper ion in plating solution | Autotitrator COM-A19 - JM Science
HIRANUMA APPLICATION DATA Automatic Titrator Data No. G10 Apr. 5,2019
Metals Quantitative determination of copper ion in plating solution

1. Abstract

The photometric titration using a photometric probe is generally applied for the determination of copper ion (Cu2+). However, the measurement of cloudy or colored sample has difficulty to analyze with the photometric titration. The measurement using copper ion-selective electrode performs the potentiometric titration which it is not affected by the suspended particle and the indicator reagent is not required for the titration.     

Cu²⁺ + Na₂EDTA → Cu-EDTA + 2Na²⁺  

This report introduces an example of the measurement for copper ion in plating solution with chelatometric titration using copper ion-selective electrode.

2. Configuration of instruments and Reagents

(1) Configuration of instruments
  Main unit : Hiranuma Automatic Titrator COM series
  Electrodes : Copper ion-selective electrode CUi-081
Reference electrode RE-201Z
(2) Reagent    
  Titrant : 0.1 mol/L EDTA standard solution
  Buffer solution : Sodium acetate- acetic acid buffer pH 5
Dissolve 13.6 g of sodium acetate in DI water and prepare 100 mL (1 mol/L)
of the solution. Adjust the pH to 5 by adding acetic acid.

3. Measurement procedure

(1) Dispense 5 mL of sample into a 100 mL beaker with volumetric pipette.
(2) Add about 50 mL of DI water.
(3) Add 5 mL of buffer solution with micropipette.
(4) Immerse electrode into sample solution and titrate with 0.1 mol/L EDTA standard solution.

4. Measurement conditions and results

Examples of titration conditions

Quantitative determination of copper ion in plating solution Hiranuma Autotitrator COM-A19 from JM Science

Measurement results

Number of
measurement
Size
(mL)
Titrant
volume(mL)
Concentration
(g/L)
1 5 7.623 9.639
2 5 7.603 9.614
3 5 7.622 9.638
4 5 7.611 9.624
5 5 7.595 9.603
Statistic
calculation
Average 9.62 g/L
Standard deviation 0.02 g/L
Coefficient of variation 0.16 %


Example of titration curve

5. Note

The reading of the potential might decrease with repeated use of the copper ion-selective electrode. Polishing the surface of the copper ion-selective electrode with a fine sandpaper (P800 or finer) improves the condition of the electrode.

Keywords: Copper ion, Potentiometric titration, Copper ion-selective electrode, Plating solution, Chelatometric titration

 

*Some measurement would not be possible depending on optional configuration of system.

Hiranuma aquacounter autotitrator com-a19Metals

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