This standard describes in detail the method for the determination of heavy metals content in chemical fibres using Inductance Coupled Plasma Emission Light Spectrometry (ICP-OES) and Inductance Coupled Plasma Mass Spectrometry (ICP-MS). It covers the preparation of samples, the setting of test conditions, the requirements of instrumentation and equipment, the selection of reagents and the specific provisions of test steps. It is suitable for assessing the content of heavy metals elements such as lead, cadmium and mercury in chemical fibres to ensure that they comply with relevant environment and safety standards.