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

被引：4
作者：
Machado, CMM
Cukrowski, I
Soares, HMVM
机构：
[1] Univ Porto, Fac Engn, Dept Chem Engn, REQUIMTE, P-4200465 Oporto, Portugal
[2] Univ Witwatersrand, Sch Chem, Inst Mol Sci, ZA-2050 Johannesburg, South Africa
来源：
ELECTROANALYSIS | 2005年 / 17卷 / 14期
关键词：
3-[N-tris(hydroxymethyl)methylamine]-2-hydroxypropanesulfonic acid; TAPSO; biological buffer; lead; stability constants;
D O I：
10.1002/elan.200403244
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
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 degrees 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 beta, of 3.7 +/- 0.1, 6.6 +/- 0.1, 12.9 +/- 0.1 and 17.8 +/- 0.1, respectively.
引用
收藏
页码：1291 / 1301
页数：11
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