| http://www.w3.org/ns/prov#value | - It has now been found, surprisingly, that polymers of hydrophilic olefinic monomers (A) containing a homo- or co-polymer of the same monomer (A) or of hydrophilic monomer(s) (B) different from (A) and an olefinically substituted dye indicator are excellently suitable as membranes for optical sensors for the determination of ions or gases, for example oxygen or carbon dioxide.
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