Producción Científica Profesorado

EQUILIBRIUM CONSTANTS DETERMINATION OF ASCORBIC ACID IN AQUEOUS MEDIUM BY POLARIMETRY



Alvarez Romero, Giaan Arturo

2017

Lucero Hernández-García, Alberto Rojas-Hernández, María T. Ramírez-Silva, Giaan A. Álvarez-Romero, Manuel E. Palomar-Pardavé, Av. cien. ing., 2017, 8(1), 31-41


Abstract


In this work, the acid constants of ascorbic acid (AA) by polarimetry, with a base titration of the acid, aredetermined. The results obtained by this technique were processed by adjusting the rotation angles measuredas a function of the pH, using for the fitting the Biot and additivity laws for this property. Non-linear and linearregression models were applied. The most reliable values obtained were pKa1 = 4.149 0.022 and pKa2 =11.927 0.062, achieved by non-linear regression of the data acquired to ? = 578 nm, with standard deviationsfor the fit equal to 0.046? and 0.075?, respectively. These values are comparable with those reported usingother techniques.



Producto de Investigación




Artículos relacionados

Potentiometric quantification of saccharin by using a selective membrane formed by pyrrole electropo...

Development of a Polypyrrole Selective Membrane For The Potentiometric Quantification of Saccharinat...

Nucleation and Growth Kinetics of Electrodeposited Sulfate-Doped Polypyrrole: Determination of the D...

Sequential Injection Spectrophotometric Determination of Diclofenac in Urine and Pharmaceutical Form...

Validation of a tubular bismuth film amperometric detector: Determination of diclofenac sodium by mu...

Potentiometric quantification of saccharin by using a selective membrane formed by pyrrole electropo...

Chemical studies of anthocyanins: A review

Determination of glucose by flow injection analysis with amperometric detection at Fe(III)-(tris(3,5...

Development of a Chloride Ion-Selective Solid State Sensor Based on Doped Polypyrrole-Graphite-Epoxy...

Metal content evaluation and its effect on the stability of anthocyanins