Abstract: Radiation-sensitive compositions are disclosed of a type suitable for preparing ion sensitive membranes for electrochemical ion sensors. The compositions are comprised of a radiation-sensitive polymer containing radiation-sensitive recurring units having an ionophore group and recurring units having a crosslinking group. In preparing a membrane the radiation-sensitive composition is coated onto a sensor, exposed to activating radiation to produce crosslinking in areas where the membrane structure is desired, and removed in any remaining non-exposed areas.

Abstract: An ion-sensitive composition and an ion-selective electrode is disclosed in which the ionophore is an organotin having the formulaR.sub.x.sup.1 Sn(SR.sup.2).sub.4-xorR.sub.y.sup.1 Sn(SR.sup.3 --X--R.sup.3 S).sub.4-y SnR.sup.1whereinx is 0 or an integer from 1 to 3;y is 2 or 3;each R.sup.1 independently is substituted or unsubstituted alkyl or substituted or unsubstituted aryl;each R.sup.2 independently is substituted or unsubstituted alkyl.each R.sup.3 independently is substituted or unsubstituted alkylene; and,X is a single chemical bond or a linking group.

Abstract: An ion-sensitive electrochemical sensor comprises an electrode body having an ion-sensitive polymeric membrane coated thereon. The membrane comprises a water-insoluble copolymer having ion exchange sites and has a glass transition temperature greater than about 80.degree. C. The sensor is used to determine ion concentration by contacting it with a test solution and determining the ion concentration as a function of the potential of the electrode.