Metal Complexes in Biology and Medicine | Chapter 3 | Chemical and Materials Sciences: Developments and Innovations Vol. 5

In coordinate compounds, knowledge of the stability constants of the complexes is necessary for preliminary quantitative treatment. Metal ions are fundamental elements for the maintenance of the life spans of humans, animals and plants and play an important role in biological systems.  A recent technique involving the use of paper electrophoresis is described for the study of equilibria in binary complex systems in solution. This method is based on the movement of a spot of metal ion in an electric field at various pHs of background electrolyte. A graph of pH versus mobility gives the information for binary complexes and calculates their stability constants. The logarithm stability constants of the ML and ML2 complexes of norvaline were found to be (8.61 ± 0.03; 7.05 ± 0.07), (6.93 ± 0.05; 5.47 ± 0.03) and (4.57 ± 0.02; 3.00 ± 0.05) for the mercury(II), nickel(II) and lead(II) complexes, respectively at ionic strength 0.1 M perchloric acid and a temperature of 35°C.

 

Author(s) Details

 Brij Bhushan Tewari
Department of Chemistry, University of Guyana, P.O Box: 101110, Georgetown, Guyana.

 

Ashish Kumar Tiwari
Advanced Center for Material Science, Indian Institute of Technology, Kanpur- 208016, Uttar Pradesh, India.

 

 

Please see the book here:- https://doi.org/10.9734/bpi/cmsdi/v5/1324

Measurement of Complex Formation Process of Lead (II) with Fulvic Acids at pH= 8 | Chapter 10 | Current Topics on Chemistry and Biochemistry Vol. 1

 The goal of this study is to look into the complex formation process between pure FA samples isolated from natural waters and Pb, as well as to determine the average stability constant of the lead fulvate complex.

The solubility method was used to investigate the complex formation process between Pb (II) and fulvic acids at pH=8.0. As a solid phase, a Pb(OH)2 suspension was utilised. The adsorption–chromatographic approach was used to separate fulvic acids from Paravani Lake. The value of average molecular weight of fulvic acids at pH=8 (Mw=6260) was taken into account while calculating molar concentrations of fulvic acids.

The lead dihydroxy fulvate complex with the structure 1:1 dominates the Pb(OH)2(solid) —Pb(II)(solution) —FA—H2O system at pH=8.0, with an average stability constant (Pb(OH)2FA) = 9,63x106, lg =6,98.

Author(S) Details

Tamar Makharadze
Ivane Javakhishvili Tbilisi State University, R. Agladze Institute of Inorganic Chemistry and Electrochemistry,11 Mindeli Street,0186, Tbilisi, Georgia.

View Book:- https://stm.bookpi.org/CTCB-V1/article/view/6531