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

High-performance liquid magneto-chromatography

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

Influence of the Cation Nature of the Sulphate Salt on the Electrochemical Synthesis of Sulfate-Dope...

Determination of tetracyclines in milk samples by magnetic solid phase extraction flow injection ana...

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

Mercury Ions Removal from Aqueous Solution Using an Activated Composite Membrane

Evaluación del contenido de metales y su efecto en la estabilidad de antocianinas

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

Synthesis and crystal structures of cis-palladium(II) and cis-platinum(II) complexes containing dipy...

Magnetic solids in analytical chemistry: A review