DETERMINATION OF GOLD IN GOLD JEWELLERY ALLOYS - CUPELLATION METHOD (FIRE ASSAY ) (ISO 11426:1997, IDT)
This Malaysian Standard specifies a cupellation method (fire assay) for the determination of gold in gold jewellery alloys. The gold content of the alloys should preferably lie between 333 and 999 parts per thousand (0/00).
The procedure is applicable specifically to gold alloys incorporating silver, copper and zinc. Some modifications are indicated where nickel and/or palladium are present in the so-called white gold alloys, as well as for alloys containing 990 or more parts per thousand (0/00) of gold.
This method is intended to be used as the reference method for the determination of fineness in alloys covered by ISO 9202.
