Convention on the Control and Marking of Articles of Precious Metals:Appendix I Methods of analysis and other test methods

Convention on the Control and Marking of Articles of Precious Metals

Appendix I Methods of analysis and other test methods

Geldend

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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).

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