A photometric method for determining the diffusivity of dyes in aqueous solutions in a thin horizontal cell

Resumo

A photometric method for determining the diffusivity of dyes in aqueous solutions in a thin horizontal cell using a digital camera is proposed. This method simplifies measurements and reduces the measurement time. The photometric technique that is used to determine the diffusivity does not require the construction of a calibration dependence of the brightness on the concentration. A model of the measuring instrument was developed, as well as various designs of measuring cells. The instrument was tested in experiments on measurements of the diffusivity of dyes in water. The relative error of the instrument is below 10%.