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

Document Type : Research Paper


Not mentioned


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