Graphic Data Analysis and Complex Formation Curves as Modelling and Optimization Tools in Potentiometric and Voltammetric Speciation Studies of a Pb(TAPSO)x(OH)y System

The formation of complex species between lead and TAPSO, a commercialized biological buffer, was evidenced and discussed. Formation constants of Pb(TAPSO)x(OH)y system have been studied by direct current polarography and by glass electrode potentiometry at fixed total–ligand and total–metal concen...

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Bibliographic Details
Published in:Electroanalysis (New York, N.Y.) N.Y.), 2005-07, Vol.17 (14), p.1291-1301
Main Authors: Machado, Carina M. M., Cukrowski, Ignacy, Soares, Helena M. V. M.
Format: Article
Language:English
Subjects:
3-[N-Tris(hydroxymethyl)methylamine]-2-hydroxypropanesulfonic acid
Biological buffer
Lead
Stability constants
TAPSO
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Summary:The formation of complex species between lead and TAPSO, a commercialized biological buffer, was evidenced and discussed. Formation constants of Pb(TAPSO)x(OH)y system have been studied by direct current polarography and by glass electrode potentiometry at fixed total–ligand and total–metal concentration ratio and varied pH, at 25.0 °C and ionic strength set to 0.1 M KNO3. The graphic analysis revealed to be a very powerful tool in the prediction and refinement operations of Pb–(TAPSO)x(OH)y system. The proposed final model for this system is: PbL, PbL2, PbL2(OH) and PbL2(OH)2, with stability constants values, as log β, of 3.7±0.1, 6.6±0.1, 12.9±0.1 and 17.8±0.1, respectively.
ISSN:1040-0397
1521-4109
DOI:10.1002/elan.200403244