This International Standard specifies an electrolytic method for the determination of copper in aluminium alloys. The method is applicable to the determination of copper content greater than or equal to 0,50 %. The method does not apply completely to the following special cases for which it should be modified as described in Annex A or Annex B : a) alloys containing tin or antimony (see Annex A); b) alloys containing bismuth (see Annex B).