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ILNAS-EN 31427:1994 Edition 04/1994
Determination of silver in silver jewellery alloys - Volumetric (potentiometric) method using potassium bromide (ISO 11427:1993)
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Abstract

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.

Status

Standard - Superseded

Origin

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

Implementation

start of the vote on the project      date of ratification (dor)    01/04/1994
end of the vote on the project      date of anouncement (doa)    31/07/1994
start of the vote on the final project    22/07/1993   date of publication (dop)    31/10/1994
end of the vote on the final project    22/01/1994   date of withdrawal (dow)    31/10/1994


Publication Official Journal
of the Grand-Duchy of Luxembourg
02/12/1994
Reference

Relations

Evolutions
ILNAS-EN ISO 11427:2016
ILNAS-EN 31427:1994/AC:1994

International Classification for Standards (ICS codes) :

39.060 : Jewellery

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