| http://www.w3.org/ns/prov#value | - M-B-L-X wherein M is a membrane or composite membrane derivatized to have a hydrophilic surface and containing polar functional groups; L is a ligand having an affinity for metallic ions (e.g., cobalt, nickel, copper, zinc and combinations thereof) and containing a functional group reactive with an activated polar group from the membrane; B is the covalent linkage formed by the reaction between th
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