The least squares estimation of stability constants of complexes of SNAZOXS with copper(II), nickel(II), and cobalt(II) ions from different spectrophotometric data

SummaryThe characteristics of experimental error in measurement of platelet radioactivity have been explored by blind replicate determinations on specimens taken on several days on each of three Walker hounds.Analysis suggests that it is not unreasonable to suppose that error for each sample is normally distributed ; and while there is evidence that the variance is heterogeneous, no systematic relationship has been discovered between the mean and the standard deviation of the determinations on individual samples. Thus, since it would be impracticable for investigators to do replicate determinations as a routine, no improvement over simple unweighted least squares estimation on untransformed data suggests itself.

Download Full-text

Stability constants of rare earths complexes. I. Thermodynamic stability constants of complexes of europium and terbium with α-hydroxyisobutyric acid

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19713370 ◽

1971 ◽

Vol 36 (9) ◽

pp. 3370-3373 ◽

Cited By ~ 4

Author(s):

J. Alexa

Keyword(s):

Stability Constants ◽

Rare Earths ◽

Thermodynamic Stability ◽

Stability Constants Of Complexes ◽

Hydroxyisobutyric Acid

Download Full-text

Extraction of strontium and barium salts by the nitrobenzene solution of dicarbolide in the presence of glymes

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19850581 ◽

1985 ◽

Vol 50 (3) ◽

pp. 581-599 ◽

Cited By ~ 41

Author(s):

Petr Vaňura ◽

Emanuel Makrlík

Keyword(s):

Stability Constants ◽

Organic Phase ◽

Equilibrium Constants ◽

Minor Role ◽

Nitrobenzene Solution ◽

Ligand Structure ◽

Stability Constants Of Complexes ◽

Separation Factors ◽

The Stability ◽

A Minor

Extraction of microamounts of Sr2+ and Ba2+ (henceforth M2+) from the aqueous solutions of perchloric acid (0.0125-1.02 mol/l) by means of the nitrobenzene solutions of dicarbolide (0.004-0.05 mol/l of H+{Co(C2B9H11)2}-) was studied in the presence of monoglyme (only Ba2+), diglyme, triglyme, and tetraglyme (CH3O-(CH2-CH2O)nCH3, where n = 1, 2, 3, 4). The distribution of glyme betweeen the aqueous and organic phases, the extraction of the protonized glyme molecule HL+ together with the extraction of M2+ ion and of the glyme complex with the M2+ ion, i.e., ML2+ (where L is the molecule of glyme), were found to be the dominating reactions in the systems under study. In the systems with tri- and tetraglymes the extraction of H+ and M2+ ions solvated with two glyme molecules, i.e., the formation of HL2+ and ML22+ species, can probably play a minor role. The values of the respective equilibrium constants, of the stability constants of complexes formed in the organic phase, and the theoretical separation factors αBa/Sr were determined. The effect of the ligand structure on the values of extraction and stability constants in the organic phase is discussed.

Download Full-text