| Abstract: | 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‐trioxabicyclo13,2,2] heptadecane‐2,14‐dione exhibited a Nernstian response for Be2+ ion over wide concentration ranges (from 3.0×10?6 to 3.0×10?2 M for polymeric membrane electrode, PME, and from 5.0×10?7 to 2.0×10?2 M for coated glassy carbon electrode, CGCE) and very low detection limits (2.0 ×10?6 M for PME and 4.0×10?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. |
