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AB-018

Simultaneous determination of gold and copper in electroplating baths and/or alloys by potentiometric titration


Resumo

This Bulletin describes the simultaneous determination of gold and copper by potentiometric titration using an Fe(II) solution as titrant. Fe(II) reduces Au(III) directly to the free metal, whereas Cu(II) does not react. By the addition of fluoride ions the Fe(III) is complexed and a shift of the redox potential is effected. Afterwards, potassium iodide is added, thus reducing the Cu(II) to Cu(I), and the free iodine is again titrated with the Fe(II) solution using a Pt Titrode.

Chemical reactions:

Au(III) + 3 Fe(II)  → Au + 3 Fe(III)

2 Cu(II) + 2 I-   → 2 Cu(I) + I2

I2 + 2 Fe(II) → 2 I- + 2 Fe(III)

Contato

Metrohm Portugal

R. Frei Luis de Granada 14G
1500-680 Lisboa

Contato