Apparent stability constant of metal complexes with diaminocyclohexanetetraacetic, diethylenetriaminepentaacetic acids and N, N, N', N'- tetraacetic acid β, β'-diaminodiethylglycol ester and their analytical application

Calculated are apparent stability constants of complexes of a number of elements (Cd, rare earth elements etc.) with diaminocyclohexanetetraacetic, diethylenetriaminepentaacetic acids and β, β'-diaminodiethylglycol ester and N, N, N', N'-tetraacetic acid. The calculation has been carried out taking into account ligand protonation, stage hydrolysis of Mesup(n+) metal ion and the formation of protonaled hydroxocomplexonates of metals in the range of pH 1-14. It is shown that of rare earth complexes have high strength. The found values of apparent stability constants, which take into accoUnt supplementary processes with the participation of the ligand and complexing agent determine complex stability under concrete conditions which exist in the above system of Mesup(n+) complexes. The method of calculation of ionic equilibria produces good results when determining or camonflaging elements