Determination of silver in silver jewellery alloys - Volumetric (potentiometric) method using potassium bromide (ISO 11427:1993, includes Corr. 1:1994) (includes EN 31427:1994/AC:1994); German version EN 31427:1994— 4 стр.
Determination of platinum in platinum jewellery alloys - Gravimetric method after reduction with mercury(I) chloride (ISO 11489:1995); German version EN ISO 11489:1995— 5 стр.
