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Complexation of Ni(II) by α-isosaccharinic acid and gluconic acid from pH 7 to pH 13
journal contribution
posted on 2007-12-21, 14:49 authored by Peter Warwick, Nicholas D.M. Evans, Tony Hall, Sarah VinesNickel reactions with gluconic acid (Gl) and α-isosaccharinic acid (ISA) have been
investigated from pH 7 to pH 13.3. Measurement of the stoichiometries of the
products of these reactions showed that NiGl and NiISA were formed at pH <7,
Ni2Gl(OH)3 and Ni2ISA(OH)3 were formed at pH values between 7 and 10 and
Ni2Gl(OH)4 and Ni2ISA(OH)4 were formed at pH >10. The stability constants for the
formation of the soluble complexes were measured using an ion exchange resin
method (Schubert method) at pH 7 and 13.3, and differential pulse polarography at
pH 7. The polarographic measurements were performed in order to check the
validity of the Schubert method at pH 7. This was due to the possibility of any
cationic complexes that may have been formed sorbing to the resin. The importance
of determining the stoichiometry of the reactions before calculating the stability
constants from measurements taken using the Schubert method is emphasised.
History
School
- Science
Department
- Chemistry
Citation
WARWICK, P. ... et al, 2003. Complexation of Ni(II) by α-isosaccharinic acid and gluconic acid from pH 7 to pH 13. Radiochimica Acta, 91, pp. 233-240Publisher
© Oldenbourg Wissenschaftsverlag, MünchenPublication date
2003Notes
This article is Restricted Access. It was published in the journal Radiochimica Acta [© Oldenbourg Wissenschaftsverlag, München] and can be found at: http://www.atypon-link.com/OLD/loi/ractISSN
0033-8230Language
- en