Design and characterization of sodium-selective optode membranes based on the lipophilic tetraester of calix[4]arene
1995; Royal Society of Chemistry; Volume: 120; Issue: 7 Linguagem: Inglês
10.1039/an9952001963
ISSN1364-5528
AutoresWing Hong Chan, Albert W. M. Lee, Ching Man Lee, Kei Wang Yau, Kemin Wang,
Tópico(s)Advanced Fiber Optic Sensors
ResumoFour 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.
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