Sorption–Spectroscopic Determination of Dimedrol as Ion Associates with Anionic Azo Dyes

The sorption of ion associates of acidic azo dyes, sulfonazo and Congo red, with Dimedrol on polyurethane foams is studied depending on pH, phase contact time, and component ratio. A method for determining Dimedrol in medicinal products is developed based on its sorption as ion associates with dyes and subsequent detection on the sorbent surface by diffuse reflectance spectroscopy.