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EN 31427:1994

Determination of silver in silver jewellery alloys - Volumetric (potentiometric) method using potassium bromide (ISO 11427:1993)

Publication date:   Jul 30, 2004

General information

99.60 Withdrawal effective   Oct 12, 2016

CEN

CEN/TC 283 Precious metals - Applications in jewellery and associated products

European Norm

39.060   Jewellery

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Scope

The principle of the method specified is dissolving the sample in dilute nitric acid and determining the silver content of the resulting solution by titration with standard potassium bromide solution, using a potentiometric indication of the equivalence point. The alloys, preferably within the range of fineness stated in ISO 9202, may contain copper, zinc, cadmium and palladium. Apart from palladium, which must be precipitated before commencing titration, these elements do not interfere with this method of determination.

Life cycle

NOW

WITHDRAWN
EN 31427:1994
99.60 Withdrawal effective
Oct 12, 2016

CORRIGENDA / AMENDMENTS

WITHDRAWN
EN 31427:1994/AC:1994

REVISED BY

WITHDRAWN
EN ISO 11427:2016

Relations

Adopted from ISO 11427:1993 IDENTICAL