عنوان مقاله [English]
نویسندگان [English]چکیده [English]
In this study, the stability constant of dioxouranium with asparagine complexes and protonation constant of asparagine at different ionic strength was investigated. Measurements have been performed at 25°C, pH<3.5 and at ionic strengths ranging from 0.1 to 1.0 mol dm-3 sodium perchlorate, using combination of potentiometric and spectrophotometric techniques. The composition of the formed complexes and their stability constants were determined by cruve fitting method and it was shown that dioxouranium forms two mononuclear 1:1 and 1:2 species in the form of UO2(HL)2+ and UO2(HL)22+. The overall analysis of the present and the previous data dealing with the determination of stability constant at different ionic strength allowed us to obtain a general equation by which the formation constant determined at a fixed ionic strength can be calculated with a good approximation.