GB/T 5124.5-2024 "Methods for chemical analysis of hard alloys, Part 5: Determination of tantalum and niobium content by Inductance-coupled plasma emission light spectrum method" regulates the determination of tantalum and niobium content in hard alloys. The standard applies to the analysis of tantalum and niobium content in tungsten-based mixed powders and hard alloys, and the determination range is 0.050% to 15.00% (tantalum) and 0.050% to 5.00% (niobium), respectively. The sample was digested by hydrofluoric acid and nitric acid by Inductance-coupled plasma emission light spectrum method, and the mass fraction of the element was calculated using the standard working Linear dispersion method. This method helps to improve the standardization level of cemented carbide in tantalum and niobium composition analysis, and supports the quality control and performance optimization of cemented carbide. The standard also involves reagents, equipment requirements, data processing and precision, etc., providing scientific and effective technical support for related industries.