IS 2113 : 2014 : Assaying Silver in Silver and Silver Alloys Methods

1. Scope

This standard prescribes the methods for determination of silver in silver alloys as below:

a) Gravimetric method, and

b) Volumetric ( potentiometric ) method.

The methods are suitable for determination of silver in the ranges as specified in IS 2112 except for fineness 999.9 for which the test method may be agreed to between the parties concerned since there associated impurities have to be determined. The silver alloys may contain copper (Cu), zinc (Zn), cadmium (Cd) and palladium (Pd). These elements except palladium, which must be precipitated before titration, do not interfere with this method of determination of silver.

The volumetric method can be used for silver of fineness 99.5 percent and below. These alloys may contain copper, zinc, cadmium and palladium. These elements, except palladium, which must be precipitated before titration, do not interfere with this method of determination of silver. In case of dispute, Gravimetric method may be used as the reference method.

2. Referenced

The standards listed below contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties to agreement based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.

IS No. Title

264 : 1976 Nitric acid (second revision)

265 : 1993 Hydrochloric acid (fourth revision)

1070 : 1992 Reagent grade water (third revision)

2112 : 2002 Silver and silver alloys, jewellery/artefacts — Fineness and marking — Specification (third revision)