Ionic Strength Dependence of Formation Constants: Complexation of Dioxouranium (VI) with Aspartic Acid

Subject Areas : Journal of Physical & Theoretical Chemistry

Farrokh Gharib ¹ , Karim Zare ² , Ramin Cheraghali ³

1 - Not mentioned
2 - Not mentioned
3 - Not mentioned

Received: 2015-04-24 Accepted : 2015-04-24 Published : 2004-05-01

Keywords: Ionic strength, Formation constant, Complexation,

Abstract :

The dependence on ionic strength of protonation of L-aspartic acid and its complexation withdioxouranium(VI) is reported in sodium perchlorate solution as a background salt. The measurementshave been performed at 25 ± 0.1 °C and various ionic strengths in the range 0.1 to 1.0 mol dm-3, using acombination of potentiometric and spectrophotometric techniques. The overall analysis of the present andthe previous data dealing with the determination of stability constants at different ionic strengths allowedus to obtain a general equation, by which a formation constant determined at a fixed ionic strength can becalculated, with a good approximation, at another ionic strength, if 0.1 ≤ ionic strength ≤ 1.0 mol dm-3sodium perchlorate.