The Determination of a Thermodynamic Stability Constant for the Cadmium Citrate (CdCit-) Complex Ion at 25° by an E.M.F. Method1

1958 ◽  
Vol 80 (19) ◽  
pp. 5050-5052 ◽  
Author(s):  
William B. Treumann ◽  
Leslie M. Ferris
Keyword(s):  
Stability Constant ◽  
Thermodynamic Stability ◽  
Complex Ion

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. 

Determination of the Stability Constant of the Calcium Dioxalate Complex

Urolithiasis ◽  
1981 ◽  
pp. 447-451
Author(s):  
John R. Burns ◽  
Birdwell Finlayson ◽  
Arthur Smith
Keyword(s):  
Stability Constant ◽  
The Stability

scholarly journals New Spectrophotometric Method for Determination of Cadmium

2009 ◽  
Vol 6 (s1) ◽  
pp. S496-S500
Author(s):  
K. S. Parikh ◽  
R. M. Patel ◽  
K. N. Patel
Keyword(s):  
Stability Constant ◽  
Spectrophotometric Method ◽  
Basic Medium ◽  
Buffer Solution ◽  
Solution Ph ◽  
Yellow Colour ◽  
Maximum Absorbance ◽  
The Stability

The reagent 2-hydroxy-4-n-butoxy-5-bromopropiophenone thiosemicarbazone (HBBrPT) has been used for the determination of Cd(II) by using spectrophotometric method. The reagent HBBrPT gave an intense yellow colour with Cd(II) solution in basic medium. The maximum absorbance was observed at 440 nm, in basic buffer solution (pH 10.00). The molor absorptivity and Sandell’s sensitivity of Cd(II)-HBBrPT complex were 4035 mol-1cm-1and 0.02765 μg cm-2respectively. The stability constant of 1:2 Cd(II)-HBBrPT complex was 8.46×106. The effect of various iron was also studied.

scholarly journals Spectrophotometric investigation of the Fe(III)-disulphonate hydroquinone complex

2005 ◽  
Vol 70 (4) ◽  
pp. 651-659
Author(s):  
Mirjana Obradovic ◽  
Snezana Mitic ◽  
Snezana Tosic ◽  
A.N. Pavlovic
Keyword(s):  
Stability Constant ◽  
Spectrophotometric Method ◽  
Calibration Curve ◽  
Relative Stability ◽  
Time Stability ◽  
Acid Media ◽  
Influence Of Temperature ◽  
Complex Dependence ◽  
Indigo Blue

Iron(III) form an indigo-blue complex with the disulphonated product of hydroquinone (K2S2Hy) in acid media with an absorption maxima at 600 nm. The time stability of the complex, dependence of the complex absorbance on pH and the influence of temperature and solvent were followed on the basis of spectrophotometric measurements. Using the Job, mole ratio and Henry?Franck?Ostwald methods, the composition and relative stability constant of this complex, in 80 vol.% ethanol as solvent, were determined (1:1;log??293 = 3.37). A new spectrophotometric method for the determination of iron has been developed and the calibration curve is linear in the concentration range from0.65 to 6.45 ?g cm-3. The effects of foreign ions on the determination of iron were investigated in order to assess the selectivity of the method. The method was applied for the determination of Fe(III) in the natural juice of beet.

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