Analysis of Salts by ICP-OES with Dual Side-On Plasma Observation

Application Brief

Analysis of Impurities in High-Purity Precious Metals With Axial Plasma Observation

The purity of precious metals is the main factor for their monetary value. Therefore, it needs to be most accurately determined when trading precious metals or precious metal products whereby contents of up to 99 % are determined with ICP-OES following the bracketing method (EN ISO 11494, 11495). For high-purity gold and platinum, the determination of the precious metal content is done with a difference method. Here the impurities are measured, and the purity of the precious metal is calculated by a subtraction of all measured impurities.

Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) can be perfectly used for the analysis of impurities in precious metals. Due to its multi-element capability - large linear dynamic range and high sensitivity - it is the recommended analytical procedure for the analysis of contamination traces in high purity gold and platinum. The application is described in the ISO standard 15093.

This report describes the principle methodology for the analysis of trace elements in precious metals. It presents typical detection limits for a wide range of elements as well as studies on accuracy.