Abstract

Method of vis spectrometry based on measuring solution color,using digital camera and digital image processing.

Author(s): Anastas Dimitrov Dakashev, Stancho Valkanov Pavlov, Krasimira Angelova Stancheva

Method of molecular absorption spectral analysis in visible region is developed where the solution color is measured instead of determining the absorbance of the solution. Solution color ismeasured by a digital camera. To define the solution color, CIE RGB colorimetric system is used. A dependence of any of the three (R, G or B) tristimulus values on concentration is applied for finding analyte concentration. Intensity of the light source, respectively, intensity of the light passed through the test solution, affects the sensitivity of analysis, as well as the range of concentrations to be determined by this method. Solutions of K2Cr2O7, KMnO4, Fe3+, Cu2+, and NH4 + are analyzed. The analysis can be done with any spectrophotometer, if it is possible a digital camera to be put in the path of the light beamafter the cuvette.