Comparison of the application of Debye-Huckel and specific ion interaction theories for the complexation of tungsten(VI) with ethylenediaminediacetic acid |
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Authors: | Kavosh Majlesi Karim Zare Saghar Rezaienejad Fatemeh Nemati |
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Institution: | (1) Chemistry Department, Science and Research Branch, Islamic Azad University, Tehran, Iran;(2) Chemistry Department, Shahid Beheshti University, Tehran, Evin, Iran |
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Abstract: | Equilibrium of the reaction of tungsten(VI) with ethylenediaminediacetic acid (EDDA) has been investigated in aqueous solution
of pH 7.5 and 25°C. All measurements have been carried out at different ionic strengths ranging from (0.1 to 1.0) mol dm−3 (NaClO4). According to our results the metal to ligand ratio is 1: 1. Stability constants and stoichiometry of the complex have been
determined from a combination of potentiometric and UV spectroscopic measurements. In this semi-empirical model, two parameters
have been introduced in a Debye-Huckel type equation based on the Gauss—Newton nonlinear least-squares method and minimizing
the sum of the squares of the errors. Comparison of the ionic strength effect on these complex formation reactions has been
made using a Debye-Huckel type equation and Bronsted—Guggenheim—Scatchard specific ion interaction theory (SIT).
Published in Russian in Zhurnal Neorganicheskoi Khimii, 2009, Vol. 54, No. 5, pp. 864–868.
The article is published in the original |
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