The calculation of stability constants of weak complexes from spectrophotometric data

1972 ◽  
Vol 34 (6) ◽  
pp. 1885-1890 ◽  
Author(s):  
P. Gans ◽  
H.M.N.H. Irving
Keyword(s):  
Stability Constants ◽  
Weak Complexes ◽  
Spectrophotometric Data

Sectrophotometric Investigation of U(VI) Chloride Complexation in the Naci/NaClO4 system

1999 ◽  
Vol 556 ◽  
Author(s):  
Patricia Paviet-Hartmann ◽  
Mavis R. Lin
Keyword(s):  
Stability Constants ◽  
Chloride Ions ◽  
Solution Chemistry ◽  
Chloride Complexes ◽  
Waste Isolation Pilot Plant ◽  
Vis Spectroscopy ◽  
Weak Complexes ◽  
Naci Concentration ◽  
Radioactive Release ◽  
Apparent Stability

AbstractPost closure radioactive release scenarios from geologic salt formation, such as the WIPP (Waste Isolation Pilot Plant) (USA) include hydrologic transport of radionuclides through a chloride saturated aquifer. Consequently, the understanding of actinide solution chemistry in brines is essential for modeling requiring accurate knowledge of the interaction between AnO22+ and chloride ions. Complexation constants of two U(VI) chloride species UO2Cl+ and UO2Cl20 have been intensively studied for about 40 years using different methods. However, large uncertainties reflect the general difficulty in determining accurate stability constants of weak complexes. In order to model the behavior of U(VI) in brines, we studied the formation of its chloride complexes by UV-Vis spectroscopy as a function of the NaCI concentration at 25 °C. The experiments were performed at constant ionic strength by varying the concentration ratio of NaCI and NaClO4. Deconvolution resulted in single component absorption sepectrum for UO2Cl+ and UO2Cl20. The apparent stability constants of UO2Cl+ and UO2Cl20 are determined at different ionic strengths. The experimental data are used to parameterize using the SIT approach.

Stability constants of Ni(II)- and Cu(II)-N-heterocycle complexes according to spectrophotometric data

2015 ◽  
Vol 89 (12) ◽  
pp. 2254-2258 ◽  
Author(s):  
Samata Badhe ◽  
Pradip Tekade ◽  
Sonal Bajaj ◽  
Shrikant Thakare
Keyword(s):  
Stability Constants ◽  
Spectrophotometric Data
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