| http://www.w3.org/ns/prov#value | - The process according to claim 1 characterized in that the reducing agent is a solid insoluble polymeric resin selected from the group consisting of polythiolstyrene resin, polyvinylhydroquinone resin, formaldehyde-phenolhydroquinone resin, cuprous complexed resin, ferrous complexed resin and electron exchange resin. 6.
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