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A method is presented for the sensing of ions by determining the concentration of corresponding salts (KCl, NaCl, MgCl 2 , CaCl 2 , FeCl 3 , FeSO 4 , AlCl 3 ) in water, based on Fluorescence resonance energy transfer (FRET) process. The principle of the proposed sensor is based on the change of FRET efficiency between two laser dyes Acriflavine and Rhodamine B in presence of different ions (K + , Na + , Mg 2+ , Ca 2+ , Fe 2+ , Fe 3+ , Al 3+ ).Nanodimensional clay platelet laponite was used to enhance the efficiency of the sensor.