| http://www.w3.org/ns/prov#value | - acids such as phthalic acid, terephthalic acid or oxalic acid with an appropriate counter ion as a cation, said cation preferably being an alkali or umion alkaline earth metal ion, preferably Na +, K +, Ca +2 or Mg +2 or am- monium or a primary secondary or tertiary ammonium ion group.
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