title: Determination of the refractive index of glucose-ethanol-water mixtures using spectroscopic refractometry near the critical angle.
abstract: A spectroscopic refractometer was used to investigate the dispersion curves of ethanol and D-glucose solutions in water near the critical angle; here, the reflectivity was measured using a white source. Dispersion curves were obtained in the 320-1000 nm wavelength range with a resolution better than 10(-4) for the refractive index, n. The differential refractive index is measured as a function of wavelength, and a simple expression is proposed to obtain the refractive index of the glucose-ethanol-water ternary system. Using this expression, combined with the experimental differential refractive index values, the concentrations of individual components can be calculated.
authors.forename: H
authors.initials: H
authors.lastname: Sobral
authors.forename: M
authors.initials: M
authors.lastname: Peña-Gomar