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A Potentiometric Sensor for Cd2+ Based on Carbon Nanotube Paste Electrode Constructed from Room Temperature Ionic Liquid, Ionophore and Silica Nanoparticles



A novel and effective potentiometric sensor for the rapid determination of Cd2+ based on carbon paste electrode consisting of the room temperature ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate, multiwalled carbon nanotubes, silica nanoparticles and ionophore was constructed. The prepared composite has a low potential drift, high selectivity and fast response time, which leads to a more stable potential signal. A linear dynamic range of 4.50×10−9–1.00×10−1 mol L−1 with a detection limit of 2.00×10−9 mol L−1 was obtained. The modified electrode was successfully applied to the accurate determination of trace amounts of Cd2+ in environmental and biological samples.