In situ determination of high hydrogen ion concentrations in aqueous solutions using a Nafion membrane containing Rhodamine 6G
Abstract
Based on the different optical absorption spectrum and fluorescence emission intensity of Rhodamine 6G in neutral and acidic solutions, a Nafion membrane containing Rhodamine 6G was successfully employed to determine indirectly high H+ concentrations (1–5 mol dm–3) in aqueous solutions in the temperature range 25–100 °C.