STUDY ON THE IODIDE ISE USING THE BINUCLEAR MERCURY(II)-SCHIFF'S BASE COMPLEX AS NEUTRAL CARRIER

A new potential iodide ion selective electrode by using the coordination complex of binuclear mercury(Ⅱ) 4-methyl-(2, 6-glutamic acid)-phenolate [abbreviated as Hg(Ⅱ)2-MGAP] as neutral carrier was prepared and its electrochemical behavior studied. It was found that this electrode showed anti-Hofmeister behavior and good potential response toward iodide ion in the concentration range of 7. 0×10-7-1. 0×10-1 mol·L-1, with a detection limit of 9. 0×10-7 mol·L-1, and a slope of -53. 1 mV·dec-1 in a phosphate buffer solution of pH 2. 5 at 25℃. Selectivity of this electrode towards some common anions was found to be in the following order:I- Sal-ClO4NO2-Br-NO3-F-SCN-SO32-. The response mechanism of the electrode was studied by UV-VIS spectrometry and AC impedance technique. The application of this electrode to the analysis of drug samples was studied tentatively.