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Appendix I — Methods of analysis and other test methods Verdrag inzake het onderzoek en de stempeling van edelmetalen werken

Methods of analysis and other test methods

The testing of articles of precious metals submitted for marking with the Common Control Mark consists of the two following steps:

1. the evaluation of the homogeneity of the batch, and

2. the determination of the fineness of the alloy.

1. The homogeneity of the batch may be evaluated by one of the following test methods:

a) touchstone testing;

b) testing by X-ray spectroscopy; and

c) analysis of scraps assembled from several pieces taken out of the batch.

2. The fineness of the precious metals content is determined by one of the following approved methods of analysis:

Platinum | Gravimetric method after precipitation of diammoniumhexachloroplatinate (Document EN 31210/ISO 11210: 1995)

Gravimetric method by reduction with mercurous chloride (Document EN 31489/ISO 11489: 1995)

Spectrometric method/ICP solution (Document pr EN 31494/ISO/DIS 11494)

Atomic absorption (Document ISO/WD 11492)

Gold: | Cupellation method (Document EN 31426/ISO 11426: 1997)

Spectrometric method/ICP solution (Document ISO/WD 11493)

Palladium: | Gravimetric determination with dimethyl glyoxime (Document EN 31490 / ISO 11490:1995)

Spectrometric method / ICP solution (Document EN 31495 / ISO/DIS 11495)*

Silver: | Volumetric (potentiometric) method using potassium bromide (Document EN 31427/ISO 11427: 1993**)

Volumetric (potentiometric) method using sodium chloride or potassium chloride (Document ISO 13756: 1997).

* Shall apply only after the entry into force of the amendment to Article 2 of the Convention.

** As amended by technical corrigendum 1:1994: “Clause 4.2: Potassium bromide, solution, c(KBr)=0,1 mol/l”.

Regeling
Verdrag inzake het onderzoek en de stempeling van edelmetalen werken
Soort
Verdrag
Geldend vanaf
01-01-2019
BWB-id
BWBV0004101
Versie
2019-01-01_0

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