New macrocyclic diamides as neutral ionophores for highly selective and sensitive PVC-membrane electrodes for Be2+ ion

摘要

Five recently synthesized macrocyclic diamides were investigated to characterize their ability as beryllium ion carriers in potentiometric PVC-membrane electrodes. The electrodes based on 1,15-diaza-3,4;12,13-dibenzo-5,8,11-trioxabicyclo[13,2,2] heptadecane-2,14-dione exhibited a Nernstian response for Be2+ ion over wide concentration ranges (from 3.0 x 10(-6) to 3.0 x 10(-2) M for polymeric membrane electrode, PME, and from 5.0 x 10(-7) to 2.0 x 10(-2) M for coated glassy carbon electrode, CGCE) and very low detection limits (2.0 x 10(-6) M for PME and 4.0 x 10(-7) M for (CGCE). The electrodes possess low resistances, fast responses, satisfactory reproducibilities and, most importantly, good selectivities relative to a variety of other common cations. The potentiometric response of the electrodes is independent of pH of test solution in the pH range of 4.0-7.5. The proposed sensors were used to determine beryllium ion in water samples. [References: 51]