Abstract
Four types of lipophilic calixarene ionophores have been used in the design of sodium-selective optode membranes. Plasticized poly(vinyl chloride) (PVC) membranes incorporating the tetraester of calix[4]arene and a neutral H +-selective chromo-ionophore (ETH 5294) have proved to be excellent reversible sensing devices for the optical determination of the sodium cation in pH-buffered solutions. At pH 9.0, the absorbance response of the optode shows a good correlation with the theoretically derived formula in the range from 1 × 10-6 to 10-2 mol l-1 sodium ion. Dynamic range, reproducibility, response time and the selectivity of the new optode membranes are discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 1963-1967 |
| Number of pages | 5 |
| Journal | Analyst |
| Volume | 120 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 1995 |
Scopus Subject Areas
- Analytical Chemistry
- Biochemistry
- Environmental Chemistry
- Spectroscopy
- Electrochemistry
User-Defined Keywords
- Calixarene ionophore
- Optode membrane
- Plasticized poly (vinyl chloride) membrane
- Sodium determination
- Spectrophotometry