A Fast Response Strontium Ion-Selective Electrode Prepared by Sol-Gel Membrane Technique

摘要

A sol-gel electrode, based on 6-(4-nitrophenyl)-2-phenyl-4,4-dipropyl-3,5-diaza-bicydo [3,1,0] hex-2-ene (NPDBH) as a neutral ionophore, was successfully developed for the detection of Si2+ in aqueous solutions. Theoretical calculations confirmed NPDBH selectivity toward strontium in comparison with some other metal ions. The electrode responds to Sr2+ ion with a sensitivity of 29.1 +/- 0.4 mV/decade over the range 8.0 x 10(-7)-1.0 x 10(-1) m. Selectivity coefficients determined by matched potential method (MPM) indicate high selectivity for strontium ions. The electrode has a fast response time of 11 s and a working pH range of 3.0-10.0. The sol-gel electrode shows detection limit of 7.5 x 10(-8) M.