A spectrophotometric determination of the stability constants of iron(III) chelates with halo substituted 8-hydroxy quinoline-7-sulfonic acid derivatives

1970 ◽  
Vol 32 (10) ◽  
pp. 3333-3335 ◽  
Author(s):  
K. Balachandran ◽  
Samir K. Banerji
Keyword(s):  
Stability Constants ◽  
Spectrophotometric Determination ◽  
Sulfonic Acid ◽  
The Stability ◽  
Hydroxy Quinoline

Complexation equilibria between gallium(III) and 4-(4'-methyl-2'-thiazolylazo)-2-methylresorcinol. Derivative spectrophotometric determination of gallium in biological samples

1990 ◽  
Vol 55 (6) ◽  
pp. 1500-1507 ◽  
Author(s):  
Ana I. Jiménez ◽  
Francisco Jiménez ◽  
Juan P. Pérez ◽  
Juan J. Arias
Keyword(s):  
Blood Serum ◽  
Numerical Method ◽  
Stability Constants ◽  
Spectrophotometric Determination ◽  
Human Urine ◽  
Biological Samples ◽  
Second Derivative ◽  
Serum Samples ◽  
The Stability

The reaction of Ga(III) with 4-(4'-methyl-2'-thiazolylazo)-2-methylresorcinol (H2L) at I = 0.25 mol l-1, (NaNO3) was investigated spectrophotometrically. Numerical method was used to evaluate the stability constants of the complexes formed GaH2L2 (log β122 = 37.03±0.09); GaHL (log β111 = 19.08±0.06); GaL (log β101 = 13.65±0.16). A method is developed for the determination of gallium using first and second derivative spectrophotometry and the effect of interferences has been evaluated. The method has been applied to the determination of gallium in human urine and blood serum samples.

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