pH-Spectrum of
Bayer Liquor Copper - Complex


recorded by Dr. G. Mermigidis

Experimental:

System Cu - (1 mmol/L CuCl2 x 2 H2O / dist. water),
System Al - (1 mmol/L AlCl3 x 6 H2O / dist. water),
System (Cu+ST) - (1 mmol/L CuCl2 / 500 Ál Bayer Liquor / dist. water),
System (Cu2+ST2) - (2.5 mmol/L CuCl2 / 500 Ál Bayer Liquor / dist. water),
System (Al+ST) - (1 mmol/L AlCl3 / 500 Ál Bayer Liquor / dist. water),
System ST/ST2 - (500 Ál Bayer Liquor / dist. water)


Results:

- The pH-Spectrum of Bayer Liquor ADCTAC1 ST - Cu Complex


Fingerprints

System Cu: The forming of Cu(OH)2 between pH 6.3 and pH 7.5 could be shown.
System Al: The forming of Al(OH)3 between pH 4.4 and pH 8.2 could be shown.

Systemprints

System (Cu+ST): The forming of a copper complex with parts of Bayer Liquor in the pH area of 4.7 to 12.4 could be shown.
System (Al+ST): The forming of a aluminium complex with parts of Bayer Liquor in the pH area of 1.8 to 12.5 could be shown.


- The pH-Spectrum of Bayer Liquor ADCTAC1 ST


Fingerprints

System ST/ST2: At pH 11.1 the protonation of Bayer Liquor begins, the mistake for the pH-value is ± 0.1.

Systemprints

System (Cu+ST/Cu2+ST2): At pH 11.1 the titration of the Bayer Liquor begins. A higher concentration of CuCl2 x 2 H2O in System (Cu2+ST2) slows down the protonation of the unknown complexing agent, which is part of Bayer Liquor.

If you have any question please do not hesitate to contact:

Alcoa of Australia Limited
Research and Development Department
Sharon L. Eyer
Cockburn Road
6167 Kwiniana, Western Australia
Australia
Phone 00618/9410 3292
Fax 00618/9410 3197
emailááSharon.Eyer@alcoa.com.au