| The application of ion-selective electrode is a typical kind of potential analytical method that acts as an indicator electrode, which is also an important branch of the electrochemical analysis. Since the late 1960s, many ions carriers with high selectivity for specific ions have been applied to measure different environmental samples, for this method offers many advantages, such as fast speed, ease of preparation, procedures relatively fast response, better selectivity, wide linear dynamic range and low detection limit. Ion-selective electrodes (ISEs) based on polymeric membrane with ion carriers have been used in the fields of environmental, medicinal and agricultural analysis.Mercury(II) is one of the most important parameters of aqueous samples and plays an important role in many areas such as industry, agriculture, biology, pharmaceutical industry, environmental protection and so on. The preparation of mercury(II) sensors have always been one of the major interests of the field of chemical sensors. In this paper, we reported a new mercury(II) ion-selective electrode, based on the 4-(4-N,N-dimethylphenyl)-2,6-dephenyl pyrylium tetrafluoroborate as the ionophore. The electrode shows a good selectivity for mercury(II) ions. The electrode indicates a good linear response for mercury(II) over a wide concentration range from1.0×10?8-1.0×10?3 mol/L, with a near-Nernstian slope of 34mV per decade and the detection limit is 1.0×10?8 mol/L. This membrane electrode operates well in the pH range of 2.5–7.0 and can be used for at least 30 days without observing any considerable deviation. Selectivity coefficients of some mono-, di- and trivalent metal ions were also determined. The sensor exhibits high selectivity towards mercury(II), compared with the alkali, alkaline earth and transition metal ions. The electrode was also applied as an indicator electrode for potentiometric titration of mercury(II) ion with I-. To the best of our knowledge, this is the first time for this compound to be detected mercury ion, and obtained good result. We believe the electrode will be used widely in the future.The materials which are liquid state at a room temperature or near the room temperature are named room-temperature ionic liquids (RTILs) or room temperature molten salts. The RTILs are the perfect substitute of conventional solvents owing to its highly conductivity, wide electrochemical widow, neglectable vapor tension and special solubility. The study of RTILs accord with the development of green chemistry, and are paid great attention to by the researchers in world in recent years. Here, we described the Electrogenerated Chemiluminescence (ECL) processes of the Tris(2'2-bipyridine) ruthenium(Ⅱ) (Ru(bpy)32+) in RTILs 1-butyl-3-methylimidazolium tetrafluorobrate. As we all known that Ru(bpy)32+ is one of the most important used reactants in the ECL process. The influence of tri-n-propylamine (TPrA) on the ECL process was also demonstrated. And the results were interesting. For the unique of property, it could be used as medium for water-solubility and water-insolubility. So the inhibition of Ru(bpy)32+ ECL was carried out by naphthol. Recently, there were few documents about the ECL application of RTIL. We prepared 1-butyl-3-methylimidazolium tetrafluorobrate based on the reported method, and studied the ECL of Ru(bpy)32+. This is very important for the development of ECL of Ru(bpy)32+. |
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