A new type of ion-selective electrode is described in which ion-exchange sites are immobilised in a polymeric membrane by covalent bonding. Membranes were prepared by cross-linking a styrenebutadienestyrene triblock copolymer with triallyl phosphate. After subsequent hydrolysis these membranes were evaluated as Ca2+ sensors. The electrodes formed exhibited an extended Nernstian response to Ca2+ (10-'-10-.6 M) and good selectivity over other alkaline earth and alkali metals. Such electrodes offer very fast response times, extended lifetimes and a wide y H working range. The possibilities of this new class of ion-selective electrode are also discussed.

A further study is reported of a calcium ion-selective electrode where the sensor is a dialkylphosphate group which is covalently bound to poly (styreneb-butadiene). Selectivity in the order Ca2+ > Ba2+ > Sr2+ > Mg2+ > M+ was found. Interference was encountered from transition metal cations but no irreversible poisoning was observed. The response to surfactants was found to be less than that exhibited by established electrodes. The performance of the covalently bound sensor electrode for the monitoring of coking-plant effluent has been compared with other analytical techniques. This electrode appears to offer advantages of robustness, reliability and improved lifetime over a commercial liquid membrane electrode and a PVC membrane electrode for this application.

Progress in Polymer Science 4 (1975) 71-208. doi:10.1016/0079-6700(75)90004-02016-03-04T18:46:49

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