Dependences of the Optical Absorption Spectra and Refractive Index of Rhodamine B in Molecular Form Immobilized in a Polymer Film on the Concentration of Lead Ions in Water

The dependences of the adsorption and refractometric parameters of a polymer composition containing Rhodamine B in the molecular state on the concentration of lead atoms are studied. These dependences are used as a basis of an express-method of determining the concentration of lead ions in water, the sensitivity of which is shown to be as high as 0.001 mg/L, which is below the maximum permissible concentration. The use of the water-insoluble dye as a material sensitive to lead ions shows the possibility of developing a stable sensor based on the effect under study. The use of the frustrated total internal reflection method for determining the lead concentration by the aforementioned optical parameters is considered.