NBN EN 31427:1994

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

WITHDRAWN

About this standard

Languages
German, English and French
Type
NBN
Standards committee
CEN/TC 283
Status
WITHDRAWN
Publication date
15 November 1994
Replaced by
NBN EN ISO 11427:2016
Corrected By
EN 31427:1994/AC:1994
ICS Code
39.060 (Jewellery)
Withdrawn Date
06 March 2023
Price
€ 50,00

About this training

Summary

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.