Study of the Nickel Complex Formation with Citric Acid in A Mixture Alkyl Polyglycoside10 (APG10) Surfactant/Water System

Abstract The stability constants of complexes formed by metal cations Ni(II) and citric acid in water and in APG10 surfactant/water medium are determined by the pH titration method combined with using Hyss 2009 simulation software. Under experimental conditions, the Ni(II) complexes with citric acid ligand were determined consisting of [NiCit], [NiHCit], [NiCit2]4- and [NiHCit2]3-. The logβ values of the stability constants of the complex species are linearly dependent and decreases with increasing concentration of APG10. The influence of APG10 surfactant on the decrease of stability constants maybe explained by the interation of the surfactant micelles with the complex species. In 0.5% APG10/water solution, the decrease in stability constant value of Ni(II) – Citric complexes compared to these values in the aqueous environment are from 4.367 to 14.126 times.

Keywords— Stability constant, Complex, Citric acid, APG10 non-ionic surfactant.

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