0000000000764552
AUTHOR
J. M. Iranzo Adrian
The linear absorbances method adapted to systems with two interfering compounds
The paper exposes the theoretical and experimental study performed with the purpose to extend the application of the Linear Absorbances Method to more complex systems, which present two spectral interferences. The curves of collinearity are developed and a theoretical study of them is carried out. The theoretical equations developed are experimentally tested and the influence of the variables involved in the Linear Absorbance Method is studied, too. It is concluded that the use of couples of collinear wavelengths of the interferents allows to obtain the concentration of a compound in the presence of two interfering substances.
Determination of trimethoprim by the linear absorbances method
The determination of trimethoprim in the presence of dyphylline, proxyphylline, theophylline and caffeine by the linear absorbances method is described. Collinear couples of wavelengths, for the interfering dyphylline-proxyphylline-theophylline-caffeine system (in H2SO4, 0.05 mol/L), are provided in order to allow the determination of the analyte in the presence of these interfering substances.