A process for the preparation of iodixanol by dimerisation of 5-acetamido-N,N\u2032-bis -2,4,6-triiodo-isophthalamide in which, after the dimerisation step, unreacted Compound A is precipitated from the reaction mixture and recovered for re-use. This invention also relates to the treatment of pathological conditions, e. The number of the atoms of the base metal, forming metallic oxides without alloying with the platinum, is less than 5 atomic % of the number of the atoms of the platinum on a surface of the catalytic particles. The clip device also has an attachment connected to the arm, the attachment configured to removably receive the container. in the pharmaceutical field, in the cosmetic industry, the foodstuffs industry, the textile industry and other industrial fields.