Electrochemical sensors for the determination of Ba(II) ions

Abstract

Two solid-state membrane and coated wire electrochemical sensors have been developed based on barium sulphate nanoparticles. BaSO4 nanoparticles are synthesized by the chemical co-precipitation technique. BaSO4 nanoparticles disc used to design the solid- state membrane sensor and the BaSO4 nanoparticles utilized to fabricate the coated wire sensor. The two sensors display linear responses over the concentration ranges of 1.0×10-5-1.0×10-1mol L-1 Ba2+ ions with cationic slopes of 25.7±0.1732and 29.8±1.29615 mV decade-1 for the solid-state membrane and coated wire sensors, respectively. The lower limits of detection are 2.7×10-6 and 2.5×10-6 mol L-1 Ba2+ ions for the solid-state membrane and coated wire sensors, respectively. The response time for the two sensors is instantaneous (1 s), the useful life span for the solid-state membrane and coated wire sensors are 2 and 8 months, respectively. ThepH profile is studied and it is found that the two sensors have a wide range of used pH.the two sensors have a higher selectivity for Ba2+ ions over mono, bi, and trivalent metal ions