Polarographic determination of composition and thermodynamic stability constant of a complex metal ion

1988 ◽  
Vol 65 (10) ◽  
pp. 916 ◽  
Author(s):  
Dolores Marin ◽  
Francisco Mendicuti
Keyword(s):  
Stability Constant ◽  
Thermodynamic Stability ◽  
Metal Ion ◽  
Polarographic Determination ◽  
Complex Metal

Polarographic determination of the stability constant of the ternary complex formed between cocaine and cobalt thiocyanate

2016 ◽  
Vol 99 (1) ◽  
pp. 10-16 ◽  
Author(s):  
Dolores Vázquez ◽  
Belit Garcinuño ◽  
Jesús Tejedor ◽  
Rafael Pardo ◽  
Luis Deban
Keyword(s):  
Stability Constant ◽  
Ternary Complex ◽  
Polarographic Determination ◽  
The Stability

Synthesis and solvatochromic studies of 2- amino-3-phenolazo1-(4-sulfophenyl)-3-methyi-5-pyrozolone and use it for the determination of trace amount of Nickel (II) in blood samples

2016 ◽  
Vol 5 (10) ◽  
pp. 4920
Author(s):  
Amar M. Ali ◽  
Hussain. J. Mohammed*
Keyword(s):  
Stability Constant ◽  
Trace Amount ◽  
Benzenesulfonic Acid ◽  
Determination Method ◽  
Blood Samples ◽  
Determination Of Nickel ◽  
Normal Human ◽  
The Stability ◽  
Normal Human Blood

A new, simple, sensitive and rapid spectrophotometric method is proposed for the determination of trace amount of Nickel (II). The method is based on the formation of a 1:2 complex with 4-(4-((2-hydroxy-6-nitrophenyl) diazenyl) -3-methyl-5-oxo-2, 5-dihydro-1H-pyrazol-1-yl) benzenesulfonic acid (2-ANASP) as a new reagent is developed. The complex has a maximum absorption at 516 nm and εmax of 1. 84 X 105 L. mol-1. cm-1. A linear correlation (0. 25 – 4. 0μg. ml-1) was found between absorbance at λmax and concentration. The accuracy and reproducibility of the determination method for various known amounts of Nickel (II) were tested. The results obtained are both precise (RSD was 1. 2 %) and accurate (relative error was 0. 787 %). The effect of diverse ions on the determination of Nickel (II) to investigate the selectivity of the method were also studied. The stability constant of the product was 0. 399 X 106 L. mol-1. The proposed method was successfully applied to the analysis of diabetes blood and normal human blood. 

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