ISO 21392:2021 “Cosmetics – Methods of analysis – Measurement of trace metallic elements by ICP-MS in finished cosmetic products” provides a method for the determination of trace metallic elements in finished cosmetic products.
This analytical method deals only with chromium, cobalt, nickel, arsenic, cadmium, antimony and lead but it can be applied to other heavy metals.
It is the technique of inductively coupled plasma mass spectrometry (ICP-MS), after digestion under pressure of the sample, which is used.