Journal of Applied Electrochemistry

, Volume 7, Issue 6, pp 495–500

Borate buffer equilibria in nickel refining electrolytes


  • B. V. Tilak
    • J. Roy Gordon Research LaboratoryINCO, Ltd
  • A. S. Gendron
    • J. Roy Gordon Research LaboratoryINCO, Ltd
  • M. A. Mosoiu
    • J. Roy Gordon Research LaboratoryINCO, Ltd

DOI: 10.1007/BF00616760

Cite this article as:
Tilak, B.V., Gendron, A.S. & Mosoiu, M.A. J Appl Electrochem (1977) 7: 495. doi:10.1007/BF00616760


Buffer capacity studies, carried out using pH titrations, demonstrated that electrolytes containing NiSO4 + H3BO3 + Na2SO4 buffer more effectively than in the presence of H3BO3 + Na2SO4. The increased buffer capacity is dependent on the concentration of both Ni2+ and H3BO3. Thermodynamic analysis of the pH titration data suggested the formation of a weak complex, Ni(H2BO3)2, (logK ∼ 3.8 to 4.9) between Ni2+ and H3BO3 in mixed chloride-sulphate electrolytes at 55° C.

Copyright information

© Chapman and Hall Ltd. 1977