Analytical Chemistry p. 738 - 742 (1990)
Update date:2022-08-04
Topics:
Morf, Werner E.
Seiler, Kurt
Rusterholz, Bruno
Simon, Wilhelm
A large variety of new optical ion-sensor constructions (optodes) can now be realized by using a poly (vinyl chloride) (PVC) membrane that incorporates a cation-selective neutral ionophore, a specially tailored H+-selective neutral chromolonophore, and lipophilic anionic sites in the same plasticized PVC membrane. Such membranes generally combine the advantages of a highly selective and reversible recognition of given ionic substrates and of a straightforward optical transduction of the recognition process. The present membrane exhibits the theoretically expected absorbance response to Ca2+ activities in different pH-buffered samples. Dynamic range, reproducibility, response time, long-time stability, and selectivity of the new optode membrane are discussed.
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