From a potentiometric
and visible spectrophotometric study of the
nickel(II)-citric acid (H3L) system in the pH range 3-6, four
complexes, NiL-, NiHL,
NiH2L+ and NiL24-, have been
characterized. Stability constants for the formation of these complexes have
been determined at 25°C in 0.1 mol dm-3 KCl.
The results suggest that the hydroxy group of citric acid is coordinated in the
nickel-citrate complexes.
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