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Accurate precious metal analysis is routinely carried out to determine the precious metal content in a wide variety of different materials. This is particularly important for fi neness determination for the hallmarking of precious metals for jewellery use (see Figure 1). The precious metal concentration in different materials can vary from parts per million (ppm) or lower in car catalyst or powdered ore samples, to virtually 100% in jewellery alloys or bullion bars. This article considers the benefi ts of analysis by inductively coupled plasma-optical emission spectrometry (ICP-OES). The wide range of sample types in which precious metals occur require that a variety of classical and instrumental methods, or combinations of the two, be used in precious metal testing. In the last six decades more than 400 methods have been published for the analysis of precious metals (1, 2). Even an experienced analytical chemist may hesitate to choose the most suitable procedure for separation and determination of precious metals in a material of unknown composition. There can be a temptation to accept the more recently published procedure as being superior to those which are well tried and tested.

FINAL ANALYSIS: <I>The Role of Inductively Coupled Plasma-Optical Emission Spectrometry in Determining the Fineness of Precious Metals</I>