Abstract
AbstractBinaphthyl‐based crown ethers incorporating anthraquinone, benzoquinone, and 1,4‐dimethoxybezene have been synthesized and tested for Rb+ selective ionophores in the poly(vinyl chloride) (PVC) membrane. The membrane containing NPOE gave a better Rb+ selectivity than those containing either DOA or BPPA as a plasticizer. The response was linear within the concentration range of 1.0×10−5–1.0×10−1 M and the slope was 54.7±0.5 mV/dec. The detection limit was determined to be 9.0×10−6 M and the optimum pH range of the membrane was 6.0–9.0. The ISE membrane exhibits good selectivity for Rb+ over ammonium, alkali metal, and alkaline earth metal ions. Selectivity coefficients for the other metal ions, log KPot were −2.5 for Li+, −2.4 for Na+, −2.0 for H+, −1.0 for K+, −1.2 for Cs+, −1.6 for NH4+, −4.5 for Mg2+, −5.0 for Ca2+,−4.9 for Ba2+. The lifetime of the membrane was about one month.
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