ionic strength dependence of formation constants: complexation of dioxouranium (vi) with aspartic acid

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.