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

Determination of primary amino acids in wines by high performance liquid magneto-chromatography

Potentiometric behavior of graphite-epoxy electrochemical transducers towards anions, cations and pH...

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

Design and Construction of Solid State Ag/AgCl Reference Electrodes Through Electrochemical Depositi...

Determination of oxytetracycline in milk samples by polymer inclusion membrane separation coupled to...

Chemical studies of anthocyanins: A review

Characterization of Main Anthocyanins Extracted from Pericarp Blue Corn by MALDI-ToF MS

Electrochemical and AFM characterization of the electropolimerization of pyrrole over a graphiteepox...

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