This International Standard specifies an oxalyldihydrazide photometric method for the determination of copper content in aluminium and aluminium alloys. The method is applicable to the determination of copper content between 0,002 and 0,8 % (m/m). The method is not completely applicable in the special case of alloys with silicon contents exceeding 1 % (m/m), for which it should be modified as described in the annex.