| http://www.w3.org/ns/prov#value | - idene-1,1-diphosphonic acid, are capable of complexing with metal ions, and especially metal ions in the II,...http://www.google.com/patents/US5678242?utm_source=gb-gplus-sharePatent US5678242 - Contacting aqueous solution of metal ions with one side of porous membrane having organic soluble complexing agent in pores to extract metal ions, contacting other side with aqueous solution of second comp
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