| http://www.w3.org/ns/prov#value | - Each such electrode exhibited seelctive behavior with respect to solutions of different cations in various concentrations and particularly with respect to divalent ions such as calcium, as shown in the following examples: EXAMPLE IV An electrode was formed as described in connection with the embodiment of FIG. 1, using a cellophane membrane and 1:4 proportions respectively of di-Z-ethylhexyl phosp
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