Spectral dependences of the optical absorption and refractive index of a composition of rhodamine b, in molecular form immobilized in a polymer film, on the concentration of lead ions in water

The dependence of the adsorption and refractometric parameters of a polymer composition containing rhodamine B in the molecular state on the concentration of lead ions is studied. The studied dependences are the basis of the rapid method for determining the concentration of lead ions in water, and its high sensitivity is shown to be 0.001 mg / l, which is lower than the maximum permissible concentration. The use of a water-insoluble dye as a material sensitive to the presence of lead ions shows the possibility of creating a stable sensor based on the studied effect. The application of the method of disturbed total internal reflection to determine the concentration of lead according to the above optical parameters is considered.