| http://www.w3.org/ns/prov#value | - In order to obtain constant results, it is therefore preferable first to remove any traces of complex-forming compounds from the organic solvents, for example by hdrogenation or Washing with acids, for example sulfuric acid, or also bases, especially aqueous alkali or alkaline earth hydroxides, or with the aid of absorbents, such as silica gel, aluminum oxide, active carbon or two or more of these
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